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linux/arch/mips/kvm/vz.c
Sean Christopherson 1cfc1c7bf5 KVM: MIPS: Hardcode callbacks to hardware virtualization extensions 
Now that KVM no longer supports trap-and-emulate (see commit 45c7e8af4a
"MIPS: Remove KVM_TE support"), hardcode the MIPS callbacks to the
virtualization callbacks.

Harcoding the callbacks eliminates the technically-unnecessary check on
non-NULL kvm_mips_callbacks in kvm_arch_init().  MIPS has never supported
multiple in-tree modules, i.e. barring an out-of-tree module, where
copying and renaming kvm.ko counts as "out-of-tree", KVM could never
encounter a non-NULL set of callbacks during module init.

The callback check is also subtly broken, as it is not thread safe,
i.e. if there were multiple modules, loading both concurrently would
create a race between checking and setting kvm_mips_callbacks.

Given that out-of-tree shenanigans are not the kernel's responsibility,
hardcode the callbacks to simplify the code.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221130230934.1014142-22-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-12-29 15:41:12 -05:00

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* KVM/MIPS: Support for hardware virtualization extensions
*
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
* Authors: Yann Le Du <ledu@kymasys.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/preempt.h>
#include <linux/vmalloc.h>
#include <asm/cacheflush.h>
#include <asm/cacheops.h>
#include <asm/cmpxchg.h>
#include <asm/fpu.h>
#include <asm/hazards.h>
#include <asm/inst.h>
#include <asm/mmu_context.h>
#include <asm/r4kcache.h>
#include <asm/time.h>
#include <asm/tlb.h>
#include <asm/tlbex.h>
#include <linux/kvm_host.h>
#include "interrupt.h"
#ifdef CONFIG_CPU_LOONGSON64
#include "loongson_regs.h"
#endif
#include "trace.h"
/* Pointers to last VCPU loaded on each physical CPU */
static struct kvm_vcpu *last_vcpu[NR_CPUS];
/* Pointers to last VCPU executed on each physical CPU */
static struct kvm_vcpu *last_exec_vcpu[NR_CPUS];
/*
* Number of guest VTLB entries to use, so we can catch inconsistency between
* CPUs.
*/
static unsigned int kvm_vz_guest_vtlb_size;
static inline long kvm_vz_read_gc0_ebase(void)
{
if (sizeof(long) == 8 && cpu_has_ebase_wg)
return read_gc0_ebase_64();
else
return read_gc0_ebase();
}
static inline void kvm_vz_write_gc0_ebase(long v)
{
/*
* First write with WG=1 to write upper bits, then write again in case
* WG should be left at 0.
* write_gc0_ebase_64() is no longer UNDEFINED since R6.
*/
if (sizeof(long) == 8 &&
(cpu_has_mips64r6 || cpu_has_ebase_wg)) {
write_gc0_ebase_64(v | MIPS_EBASE_WG);
write_gc0_ebase_64(v);
} else {
write_gc0_ebase(v | MIPS_EBASE_WG);
write_gc0_ebase(v);
}
}
/*
* These Config bits may be writable by the guest:
* Config: [K23, KU] (!TLB), K0
* Config1: (none)
* Config2: [TU, SU] (impl)
* Config3: ISAOnExc
* Config4: FTLBPageSize
* Config5: K, CV, MSAEn, UFE, FRE, SBRI, UFR
*/
static inline unsigned int kvm_vz_config_guest_wrmask(struct kvm_vcpu *vcpu)
{
return CONF_CM_CMASK;
}
static inline unsigned int kvm_vz_config1_guest_wrmask(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline unsigned int kvm_vz_config2_guest_wrmask(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline unsigned int kvm_vz_config3_guest_wrmask(struct kvm_vcpu *vcpu)
{
return MIPS_CONF3_ISA_OE;
}
static inline unsigned int kvm_vz_config4_guest_wrmask(struct kvm_vcpu *vcpu)
{
/* no need to be exact */
return MIPS_CONF4_VFTLBPAGESIZE;
}
static inline unsigned int kvm_vz_config5_guest_wrmask(struct kvm_vcpu *vcpu)
{
unsigned int mask = MIPS_CONF5_K | MIPS_CONF5_CV | MIPS_CONF5_SBRI;
/* Permit MSAEn changes if MSA supported and enabled */
if (kvm_mips_guest_has_msa(&vcpu->arch))
mask |= MIPS_CONF5_MSAEN;
/*
* Permit guest FPU mode changes if FPU is enabled and the relevant
* feature exists according to FIR register.
*/
if (kvm_mips_guest_has_fpu(&vcpu->arch)) {
if (cpu_has_ufr)
mask |= MIPS_CONF5_UFR;
if (cpu_has_fre)
mask |= MIPS_CONF5_FRE | MIPS_CONF5_UFE;
}
return mask;
}
static inline unsigned int kvm_vz_config6_guest_wrmask(struct kvm_vcpu *vcpu)
{
return LOONGSON_CONF6_INTIMER | LOONGSON_CONF6_EXTIMER;
}
/*
* VZ optionally allows these additional Config bits to be written by root:
* Config: M, [MT]
* Config1: M, [MMUSize-1, C2, MD, PC, WR, CA], FP
* Config2: M
* Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP], CTXTC, [ITL, LPA, VEIC,
* VInt, SP, CDMM, MT, SM, TL]
* Config4: M, [VTLBSizeExt, MMUSizeExt]
* Config5: MRP
*/
static inline unsigned int kvm_vz_config_user_wrmask(struct kvm_vcpu *vcpu)
{
return kvm_vz_config_guest_wrmask(vcpu) | MIPS_CONF_M;
}
static inline unsigned int kvm_vz_config1_user_wrmask(struct kvm_vcpu *vcpu)
{
unsigned int mask = kvm_vz_config1_guest_wrmask(vcpu) | MIPS_CONF_M;
/* Permit FPU to be present if FPU is supported */
if (kvm_mips_guest_can_have_fpu(&vcpu->arch))
mask |= MIPS_CONF1_FP;
return mask;
}
static inline unsigned int kvm_vz_config2_user_wrmask(struct kvm_vcpu *vcpu)
{
return kvm_vz_config2_guest_wrmask(vcpu) | MIPS_CONF_M;
}
static inline unsigned int kvm_vz_config3_user_wrmask(struct kvm_vcpu *vcpu)
{
unsigned int mask = kvm_vz_config3_guest_wrmask(vcpu) | MIPS_CONF_M |
MIPS_CONF3_ULRI | MIPS_CONF3_CTXTC;
/* Permit MSA to be present if MSA is supported */
if (kvm_mips_guest_can_have_msa(&vcpu->arch))
mask |= MIPS_CONF3_MSA;
return mask;
}
static inline unsigned int kvm_vz_config4_user_wrmask(struct kvm_vcpu *vcpu)
{
return kvm_vz_config4_guest_wrmask(vcpu) | MIPS_CONF_M;
}
static inline unsigned int kvm_vz_config5_user_wrmask(struct kvm_vcpu *vcpu)
{
return kvm_vz_config5_guest_wrmask(vcpu) | MIPS_CONF5_MRP;
}
static inline unsigned int kvm_vz_config6_user_wrmask(struct kvm_vcpu *vcpu)
{
return kvm_vz_config6_guest_wrmask(vcpu) |
LOONGSON_CONF6_SFBEN | LOONGSON_CONF6_FTLBDIS;
}
static gpa_t kvm_vz_gva_to_gpa_cb(gva_t gva)
{
/* VZ guest has already converted gva to gpa */
return gva;
}
static void kvm_vz_queue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
{
set_bit(priority, &vcpu->arch.pending_exceptions);
clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
}
static void kvm_vz_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
{
clear_bit(priority, &vcpu->arch.pending_exceptions);
set_bit(priority, &vcpu->arch.pending_exceptions_clr);
}
static void kvm_vz_queue_timer_int_cb(struct kvm_vcpu *vcpu)
{
/*
* timer expiry is asynchronous to vcpu execution therefore defer guest
* cp0 accesses
*/
kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
}
static void kvm_vz_dequeue_timer_int_cb(struct kvm_vcpu *vcpu)
{
/*
* timer expiry is asynchronous to vcpu execution therefore defer guest
* cp0 accesses
*/
kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER);
}
static void kvm_vz_queue_io_int_cb(struct kvm_vcpu *vcpu,
struct kvm_mips_interrupt *irq)
{
int intr = (int)irq->irq;
/*
* interrupts are asynchronous to vcpu execution therefore defer guest
* cp0 accesses
*/
kvm_vz_queue_irq(vcpu, kvm_irq_to_priority(intr));
}
static void kvm_vz_dequeue_io_int_cb(struct kvm_vcpu *vcpu,
struct kvm_mips_interrupt *irq)
{
int intr = (int)irq->irq;
/*
* interrupts are asynchronous to vcpu execution therefore defer guest
* cp0 accesses
*/
kvm_vz_dequeue_irq(vcpu, kvm_irq_to_priority(-intr));
}
static int kvm_vz_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority,
u32 cause)
{
u32 irq = (priority < MIPS_EXC_MAX) ?
kvm_priority_to_irq[priority] : 0;
switch (priority) {
case MIPS_EXC_INT_TIMER:
set_gc0_cause(C_TI);
break;
case MIPS_EXC_INT_IO_1:
case MIPS_EXC_INT_IO_2:
case MIPS_EXC_INT_IPI_1:
case MIPS_EXC_INT_IPI_2:
if (cpu_has_guestctl2)
set_c0_guestctl2(irq);
else
set_gc0_cause(irq);
break;
default:
break;
}
clear_bit(priority, &vcpu->arch.pending_exceptions);
return 1;
}
static int kvm_vz_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority,
u32 cause)
{
u32 irq = (priority < MIPS_EXC_MAX) ?
kvm_priority_to_irq[priority] : 0;
switch (priority) {
case MIPS_EXC_INT_TIMER:
/*
* Explicitly clear irq associated with Cause.IP[IPTI]
* if GuestCtl2 virtual interrupt register not
* supported or if not using GuestCtl2 Hardware Clear.
*/
if (cpu_has_guestctl2) {
if (!(read_c0_guestctl2() & (irq << 14)))
clear_c0_guestctl2(irq);
} else {
clear_gc0_cause(irq);
}
break;
case MIPS_EXC_INT_IO_1:
case MIPS_EXC_INT_IO_2:
case MIPS_EXC_INT_IPI_1:
case MIPS_EXC_INT_IPI_2:
/* Clear GuestCtl2.VIP irq if not using Hardware Clear */
if (cpu_has_guestctl2) {
if (!(read_c0_guestctl2() & (irq << 14)))
clear_c0_guestctl2(irq);
} else {
clear_gc0_cause(irq);
}
break;
default:
break;
}
clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
return 1;
}
/*
* VZ guest timer handling.
*/
/**
* kvm_vz_should_use_htimer() - Find whether to use the VZ hard guest timer.
* @vcpu: Virtual CPU.
*
* Returns: true if the VZ GTOffset & real guest CP0_Count should be used
* instead of software emulation of guest timer.
* false otherwise.
*/
static bool kvm_vz_should_use_htimer(struct kvm_vcpu *vcpu)
{
if (kvm_mips_count_disabled(vcpu))
return false;
/* Chosen frequency must match real frequency */
if (mips_hpt_frequency != vcpu->arch.count_hz)
return false;
/* We don't support a CP0_GTOffset with fewer bits than CP0_Count */
if (current_cpu_data.gtoffset_mask != 0xffffffff)
return false;
return true;
}
/**
* _kvm_vz_restore_stimer() - Restore soft timer state.
* @vcpu: Virtual CPU.
* @compare: CP0_Compare register value, restored by caller.
* @cause: CP0_Cause register to restore.
*
* Restore VZ state relating to the soft timer. The hard timer can be enabled
* later.
*/
static void _kvm_vz_restore_stimer(struct kvm_vcpu *vcpu, u32 compare,
u32 cause)
{
/*
* Avoid spurious counter interrupts by setting Guest CP0_Count to just
* after Guest CP0_Compare.
*/
write_c0_gtoffset(compare - read_c0_count());
back_to_back_c0_hazard();
write_gc0_cause(cause);
}
/**
* _kvm_vz_restore_htimer() - Restore hard timer state.
* @vcpu: Virtual CPU.
* @compare: CP0_Compare register value, restored by caller.
* @cause: CP0_Cause register to restore.
*
* Restore hard timer Guest.Count & Guest.Cause taking care to preserve the
* value of Guest.CP0_Cause.TI while restoring Guest.CP0_Cause.
*/
static void _kvm_vz_restore_htimer(struct kvm_vcpu *vcpu,
u32 compare, u32 cause)
{
u32 start_count, after_count;
unsigned long flags;
/*
* Freeze the soft-timer and sync the guest CP0_Count with it. We do
* this with interrupts disabled to avoid latency.
*/
local_irq_save(flags);
kvm_mips_freeze_hrtimer(vcpu, &start_count);
write_c0_gtoffset(start_count - read_c0_count());
local_irq_restore(flags);
/* restore guest CP0_Cause, as TI may already be set */
back_to_back_c0_hazard();
write_gc0_cause(cause);
/*
* The above sequence isn't atomic and would result in lost timer
* interrupts if we're not careful. Detect if a timer interrupt is due
* and assert it.
*/
back_to_back_c0_hazard();
after_count = read_gc0_count();
if (after_count - start_count > compare - start_count - 1)
kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
}
/**
* kvm_vz_restore_timer() - Restore timer state.
* @vcpu: Virtual CPU.
*
* Restore soft timer state from saved context.
*/
static void kvm_vz_restore_timer(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
u32 cause, compare;
compare = kvm_read_sw_gc0_compare(cop0);
cause = kvm_read_sw_gc0_cause(cop0);
write_gc0_compare(compare);
_kvm_vz_restore_stimer(vcpu, compare, cause);
}
/**
* kvm_vz_acquire_htimer() - Switch to hard timer state.
* @vcpu: Virtual CPU.
*
* Restore hard timer state on top of existing soft timer state if possible.
*
* Since hard timer won't remain active over preemption, preemption should be
* disabled by the caller.
*/
void kvm_vz_acquire_htimer(struct kvm_vcpu *vcpu)
{
u32 gctl0;
gctl0 = read_c0_guestctl0();
if (!(gctl0 & MIPS_GCTL0_GT) && kvm_vz_should_use_htimer(vcpu)) {
/* enable guest access to hard timer */
write_c0_guestctl0(gctl0 | MIPS_GCTL0_GT);
_kvm_vz_restore_htimer(vcpu, read_gc0_compare(),
read_gc0_cause());
}
}
/**
* _kvm_vz_save_htimer() - Switch to software emulation of guest timer.
* @vcpu: Virtual CPU.
* @out_compare: Pointer to write compare value to.
* @out_cause: Pointer to write cause value to.
*
* Save VZ guest timer state and switch to software emulation of guest CP0
* timer. The hard timer must already be in use, so preemption should be
* disabled.
*/
static void _kvm_vz_save_htimer(struct kvm_vcpu *vcpu,
u32 *out_compare, u32 *out_cause)
{
u32 cause, compare, before_count, end_count;
ktime_t before_time;
compare = read_gc0_compare();
*out_compare = compare;
before_time = ktime_get();
/*
* Record the CP0_Count *prior* to saving CP0_Cause, so we have a time
* at which no pending timer interrupt is missing.
*/
before_count = read_gc0_count();
back_to_back_c0_hazard();
cause = read_gc0_cause();
*out_cause = cause;
/*
* Record a final CP0_Count which we will transfer to the soft-timer.
* This is recorded *after* saving CP0_Cause, so we don't get any timer
* interrupts from just after the final CP0_Count point.
*/
back_to_back_c0_hazard();
end_count = read_gc0_count();
/*
* The above sequence isn't atomic, so we could miss a timer interrupt
* between reading CP0_Cause and end_count. Detect and record any timer
* interrupt due between before_count and end_count.
*/
if (end_count - before_count > compare - before_count - 1)
kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
/*
* Restore soft-timer, ignoring a small amount of negative drift due to
* delay between freeze_hrtimer and setting CP0_GTOffset.
*/
kvm_mips_restore_hrtimer(vcpu, before_time, end_count, -0x10000);
}
/**
* kvm_vz_save_timer() - Save guest timer state.
* @vcpu: Virtual CPU.
*
* Save VZ guest timer state and switch to soft guest timer if hard timer was in
* use.
*/
static void kvm_vz_save_timer(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
u32 gctl0, compare, cause;
gctl0 = read_c0_guestctl0();
if (gctl0 & MIPS_GCTL0_GT) {
/* disable guest use of hard timer */
write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
/* save hard timer state */
_kvm_vz_save_htimer(vcpu, &compare, &cause);
} else {
compare = read_gc0_compare();
cause = read_gc0_cause();
}
/* save timer-related state to VCPU context */
kvm_write_sw_gc0_cause(cop0, cause);
kvm_write_sw_gc0_compare(cop0, compare);
}
/**
* kvm_vz_lose_htimer() - Ensure hard guest timer is not in use.
* @vcpu: Virtual CPU.
*
* Transfers the state of the hard guest timer to the soft guest timer, leaving
* guest state intact so it can continue to be used with the soft timer.
*/
void kvm_vz_lose_htimer(struct kvm_vcpu *vcpu)
{
u32 gctl0, compare, cause;
preempt_disable();
gctl0 = read_c0_guestctl0();
if (gctl0 & MIPS_GCTL0_GT) {
/* disable guest use of timer */
write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
/* switch to soft timer */
_kvm_vz_save_htimer(vcpu, &compare, &cause);
/* leave soft timer in usable state */
_kvm_vz_restore_stimer(vcpu, compare, cause);
}
preempt_enable();
}
/**
* is_eva_access() - Find whether an instruction is an EVA memory accessor.
* @inst: 32-bit instruction encoding.
*
* Finds whether @inst encodes an EVA memory access instruction, which would
* indicate that emulation of it should access the user mode address space
* instead of the kernel mode address space. This matters for MUSUK segments
* which are TLB mapped for user mode but unmapped for kernel mode.
*
* Returns: Whether @inst encodes an EVA accessor instruction.
*/
static bool is_eva_access(union mips_instruction inst)
{
if (inst.spec3_format.opcode != spec3_op)
return false;
switch (inst.spec3_format.func) {
case lwle_op:
case lwre_op:
case cachee_op:
case sbe_op:
case she_op:
case sce_op:
case swe_op:
case swle_op:
case swre_op:
case prefe_op:
case lbue_op:
case lhue_op:
case lbe_op:
case lhe_op:
case lle_op:
case lwe_op:
return true;
default:
return false;
}
}
/**
* is_eva_am_mapped() - Find whether an access mode is mapped.
* @vcpu: KVM VCPU state.
* @am: 3-bit encoded access mode.
* @eu: Segment becomes unmapped and uncached when Status.ERL=1.
*
* Decode @am to find whether it encodes a mapped segment for the current VCPU
* state. Where necessary @eu and the actual instruction causing the fault are
* taken into account to make the decision.
*
* Returns: Whether the VCPU faulted on a TLB mapped address.
*/
static bool is_eva_am_mapped(struct kvm_vcpu *vcpu, unsigned int am, bool eu)
{
u32 am_lookup;
int err;
/*
* Interpret access control mode. We assume address errors will already
* have been caught by the guest, leaving us with:
* AM UM SM KM 31..24 23..16
* UK 0 000 Unm 0 0
* MK 1 001 TLB 1
* MSK 2 010 TLB TLB 1
* MUSK 3 011 TLB TLB TLB 1
* MUSUK 4 100 TLB TLB Unm 0 1
* USK 5 101 Unm Unm 0 0
* - 6 110 0 0
* UUSK 7 111 Unm Unm Unm 0 0
*
* We shift a magic value by AM across the sign bit to find if always
* TLB mapped, and if not shift by 8 again to find if it depends on KM.
*/
am_lookup = 0x70080000 << am;
if ((s32)am_lookup < 0) {
/*
* MK, MSK, MUSK
* Always TLB mapped, unless SegCtl.EU && ERL
*/
if (!eu || !(read_gc0_status() & ST0_ERL))
return true;
} else {
am_lookup <<= 8;
if ((s32)am_lookup < 0) {
union mips_instruction inst;
unsigned int status;
u32 *opc;
/*
* MUSUK
* TLB mapped if not in kernel mode
*/
status = read_gc0_status();
if (!(status & (ST0_EXL | ST0_ERL)) &&
(status & ST0_KSU))
return true;
/*
* EVA access instructions in kernel
* mode access user address space.
*/
opc = (u32 *)vcpu->arch.pc;
if (vcpu->arch.host_cp0_cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (!err && is_eva_access(inst))
return true;
}
}
return false;
}
/**
* kvm_vz_gva_to_gpa() - Convert valid GVA to GPA.
* @vcpu: KVM VCPU state.
* @gva: Guest virtual address to convert.
* @gpa: Output guest physical address.
*
* Convert a guest virtual address (GVA) which is valid according to the guest
* context, to a guest physical address (GPA).
*
* Returns: 0 on success.
* -errno on failure.
*/
static int kvm_vz_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
unsigned long *gpa)
{
u32 gva32 = gva;
unsigned long segctl;
if ((long)gva == (s32)gva32) {
/* Handle canonical 32-bit virtual address */
if (cpu_guest_has_segments) {
unsigned long mask, pa;
switch (gva32 >> 29) {
case 0:
case 1: /* CFG5 (1GB) */
segctl = read_gc0_segctl2() >> 16;
mask = (unsigned long)0xfc0000000ull;
break;
case 2:
case 3: /* CFG4 (1GB) */
segctl = read_gc0_segctl2();
mask = (unsigned long)0xfc0000000ull;
break;
case 4: /* CFG3 (512MB) */
segctl = read_gc0_segctl1() >> 16;
mask = (unsigned long)0xfe0000000ull;
break;
case 5: /* CFG2 (512MB) */
segctl = read_gc0_segctl1();
mask = (unsigned long)0xfe0000000ull;
break;
case 6: /* CFG1 (512MB) */
segctl = read_gc0_segctl0() >> 16;
mask = (unsigned long)0xfe0000000ull;
break;
case 7: /* CFG0 (512MB) */
segctl = read_gc0_segctl0();
mask = (unsigned long)0xfe0000000ull;
break;
default:
/*
* GCC 4.9 isn't smart enough to figure out that
* segctl and mask are always initialised.
*/
unreachable();
}
if (is_eva_am_mapped(vcpu, (segctl >> 4) & 0x7,
segctl & 0x0008))
goto tlb_mapped;
/* Unmapped, find guest physical address */
pa = (segctl << 20) & mask;
pa |= gva32 & ~mask;
*gpa = pa;
return 0;
} else if ((s32)gva32 < (s32)0xc0000000) {
/* legacy unmapped KSeg0 or KSeg1 */
*gpa = gva32 & 0x1fffffff;
return 0;
}
#ifdef CONFIG_64BIT
} else if ((gva & 0xc000000000000000) == 0x8000000000000000) {
/* XKPHYS */
if (cpu_guest_has_segments) {
/*
* Each of the 8 regions can be overridden by SegCtl2.XR
* to use SegCtl1.XAM.
*/
segctl = read_gc0_segctl2();
if (segctl & (1ull << (56 + ((gva >> 59) & 0x7)))) {
segctl = read_gc0_segctl1();
if (is_eva_am_mapped(vcpu, (segctl >> 59) & 0x7,
0))
goto tlb_mapped;
}
}
/*
* Traditionally fully unmapped.
* Bits 61:59 specify the CCA, which we can just mask off here.
* Bits 58:PABITS should be zero, but we shouldn't have got here
* if it wasn't.
*/
*gpa = gva & 0x07ffffffffffffff;
return 0;
#endif
}
tlb_mapped:
return kvm_vz_guest_tlb_lookup(vcpu, gva, gpa);
}
/**
* kvm_vz_badvaddr_to_gpa() - Convert GVA BadVAddr from root exception to GPA.
* @vcpu: KVM VCPU state.
* @badvaddr: Root BadVAddr.
* @gpa: Output guest physical address.
*
* VZ implementations are permitted to report guest virtual addresses (GVA) in
* BadVAddr on a root exception during guest execution, instead of the more
* convenient guest physical addresses (GPA). When we get a GVA, this function
* converts it to a GPA, taking into account guest segmentation and guest TLB
* state.
*
* Returns: 0 on success.
* -errno on failure.
*/
static int kvm_vz_badvaddr_to_gpa(struct kvm_vcpu *vcpu, unsigned long badvaddr,
unsigned long *gpa)
{
unsigned int gexccode = (vcpu->arch.host_cp0_guestctl0 &
MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
/* If BadVAddr is GPA, then all is well in the world */
if (likely(gexccode == MIPS_GCTL0_GEXC_GPA)) {
*gpa = badvaddr;
return 0;
}
/* Otherwise we'd expect it to be GVA ... */
if (WARN(gexccode != MIPS_GCTL0_GEXC_GVA,
"Unexpected gexccode %#x\n", gexccode))
return -EINVAL;
/* ... and we need to perform the GVA->GPA translation in software */
return kvm_vz_gva_to_gpa(vcpu, badvaddr, gpa);
}
static int kvm_trap_vz_no_handler(struct kvm_vcpu *vcpu)
{
u32 *opc = (u32 *) vcpu->arch.pc;
u32 cause = vcpu->arch.host_cp0_cause;
u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
u32 inst = 0;
/*
* Fetch the instruction.
*/
if (cause & CAUSEF_BD)
opc += 1;
kvm_get_badinstr(opc, vcpu, &inst);
kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n",
exccode, opc, inst, badvaddr,
read_gc0_status());
kvm_arch_vcpu_dump_regs(vcpu);
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
static unsigned long mips_process_maar(unsigned int op, unsigned long val)
{
/* Mask off unused bits */
unsigned long mask = 0xfffff000 | MIPS_MAAR_S | MIPS_MAAR_VL;
if (read_gc0_pagegrain() & PG_ELPA)
mask |= 0x00ffffff00000000ull;
if (cpu_guest_has_mvh)
mask |= MIPS_MAAR_VH;
/* Set or clear VH */
if (op == mtc_op) {
/* clear VH */
val &= ~MIPS_MAAR_VH;
} else if (op == dmtc_op) {
/* set VH to match VL */
val &= ~MIPS_MAAR_VH;
if (val & MIPS_MAAR_VL)
val |= MIPS_MAAR_VH;
}
return val & mask;
}
static void kvm_write_maari(struct kvm_vcpu *vcpu, unsigned long val)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
val &= MIPS_MAARI_INDEX;
if (val == MIPS_MAARI_INDEX)
kvm_write_sw_gc0_maari(cop0, ARRAY_SIZE(vcpu->arch.maar) - 1);
else if (val < ARRAY_SIZE(vcpu->arch.maar))
kvm_write_sw_gc0_maari(cop0, val);
}
static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
u32 *opc, u32 cause,
struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
enum emulation_result er = EMULATE_DONE;
u32 rt, rd, sel;
unsigned long curr_pc;
unsigned long val;
/*
* Update PC and hold onto current PC in case there is
* an error and we want to rollback the PC
*/
curr_pc = vcpu->arch.pc;
er = update_pc(vcpu, cause);
if (er == EMULATE_FAIL)
return er;
if (inst.co_format.co) {
switch (inst.co_format.func) {
case wait_op:
er = kvm_mips_emul_wait(vcpu);
break;
default:
er = EMULATE_FAIL;
}
} else {
rt = inst.c0r_format.rt;
rd = inst.c0r_format.rd;
sel = inst.c0r_format.sel;
switch (inst.c0r_format.rs) {
case dmfc_op:
case mfc_op:
#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
cop0->stat[rd][sel]++;
#endif
if (rd == MIPS_CP0_COUNT &&
sel == 0) { /* Count */
val = kvm_mips_read_count(vcpu);
} else if (rd == MIPS_CP0_COMPARE &&
sel == 0) { /* Compare */
val = read_gc0_compare();
} else if (rd == MIPS_CP0_LLADDR &&
sel == 0) { /* LLAddr */
if (cpu_guest_has_rw_llb)
val = read_gc0_lladdr() &
MIPS_LLADDR_LLB;
else
val = 0;
} else if (rd == MIPS_CP0_LLADDR &&
sel == 1 && /* MAAR */
cpu_guest_has_maar &&
!cpu_guest_has_dyn_maar) {
/* MAARI must be in range */
BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
ARRAY_SIZE(vcpu->arch.maar));
val = vcpu->arch.maar[
kvm_read_sw_gc0_maari(cop0)];
} else if ((rd == MIPS_CP0_PRID &&
(sel == 0 || /* PRid */
sel == 2 || /* CDMMBase */
sel == 3)) || /* CMGCRBase */
(rd == MIPS_CP0_STATUS &&
(sel == 2 || /* SRSCtl */
sel == 3)) || /* SRSMap */
(rd == MIPS_CP0_CONFIG &&
(sel == 6 || /* Config6 */
sel == 7)) || /* Config7 */
(rd == MIPS_CP0_LLADDR &&
(sel == 2) && /* MAARI */
cpu_guest_has_maar &&
!cpu_guest_has_dyn_maar) ||
(rd == MIPS_CP0_ERRCTL &&
(sel == 0))) { /* ErrCtl */
val = cop0->reg[rd][sel];
#ifdef CONFIG_CPU_LOONGSON64
} else if (rd == MIPS_CP0_DIAG &&
(sel == 0)) { /* Diag */
val = cop0->reg[rd][sel];
#endif
} else {
val = 0;
er = EMULATE_FAIL;
}
if (er != EMULATE_FAIL) {
/* Sign extend */
if (inst.c0r_format.rs == mfc_op)
val = (int)val;
vcpu->arch.gprs[rt] = val;
}
trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mfc_op) ?
KVM_TRACE_MFC0 : KVM_TRACE_DMFC0,
KVM_TRACE_COP0(rd, sel), val);
break;
case dmtc_op:
case mtc_op:
#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
cop0->stat[rd][sel]++;
#endif
val = vcpu->arch.gprs[rt];
trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mtc_op) ?
KVM_TRACE_MTC0 : KVM_TRACE_DMTC0,
KVM_TRACE_COP0(rd, sel), val);
if (rd == MIPS_CP0_COUNT &&
sel == 0) { /* Count */
kvm_vz_lose_htimer(vcpu);
kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]);
} else if (rd == MIPS_CP0_COMPARE &&
sel == 0) { /* Compare */
kvm_mips_write_compare(vcpu,
vcpu->arch.gprs[rt],
true);
} else if (rd == MIPS_CP0_LLADDR &&
sel == 0) { /* LLAddr */
/*
* P5600 generates GPSI on guest MTC0 LLAddr.
* Only allow the guest to clear LLB.
*/
if (cpu_guest_has_rw_llb &&
!(val & MIPS_LLADDR_LLB))
write_gc0_lladdr(0);
} else if (rd == MIPS_CP0_LLADDR &&
sel == 1 && /* MAAR */
cpu_guest_has_maar &&
!cpu_guest_has_dyn_maar) {
val = mips_process_maar(inst.c0r_format.rs,
val);
/* MAARI must be in range */
BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
ARRAY_SIZE(vcpu->arch.maar));
vcpu->arch.maar[kvm_read_sw_gc0_maari(cop0)] =
val;
} else if (rd == MIPS_CP0_LLADDR &&
(sel == 2) && /* MAARI */
cpu_guest_has_maar &&
!cpu_guest_has_dyn_maar) {
kvm_write_maari(vcpu, val);
} else if (rd == MIPS_CP0_CONFIG &&
(sel == 6)) {
cop0->reg[rd][sel] = (int)val;
} else if (rd == MIPS_CP0_ERRCTL &&
(sel == 0)) { /* ErrCtl */
/* ignore the written value */
#ifdef CONFIG_CPU_LOONGSON64
} else if (rd == MIPS_CP0_DIAG &&
(sel == 0)) { /* Diag */
unsigned long flags;
local_irq_save(flags);
if (val & LOONGSON_DIAG_BTB) {
/* Flush BTB */
set_c0_diag(LOONGSON_DIAG_BTB);
}
if (val & LOONGSON_DIAG_ITLB) {
/* Flush ITLB */
set_c0_diag(LOONGSON_DIAG_ITLB);
}
if (val & LOONGSON_DIAG_DTLB) {
/* Flush DTLB */
set_c0_diag(LOONGSON_DIAG_DTLB);
}
if (val & LOONGSON_DIAG_VTLB) {
/* Flush VTLB */
kvm_loongson_clear_guest_vtlb();
}
if (val & LOONGSON_DIAG_FTLB) {
/* Flush FTLB */
kvm_loongson_clear_guest_ftlb();
}
local_irq_restore(flags);
#endif
} else {
er = EMULATE_FAIL;
}
break;
default:
er = EMULATE_FAIL;
break;
}
}
/* Rollback PC only if emulation was unsuccessful */
if (er == EMULATE_FAIL) {
kvm_err("[%#lx]%s: unsupported cop0 instruction 0x%08x\n",
curr_pc, __func__, inst.word);
vcpu->arch.pc = curr_pc;
}
return er;
}
static enum emulation_result kvm_vz_gpsi_cache(union mips_instruction inst,
u32 *opc, u32 cause,
struct kvm_vcpu *vcpu)
{
enum emulation_result er = EMULATE_DONE;
u32 cache, op_inst, op, base;
s16 offset;
struct kvm_vcpu_arch *arch = &vcpu->arch;
unsigned long va, curr_pc;
/*
* Update PC and hold onto current PC in case there is
* an error and we want to rollback the PC
*/
curr_pc = vcpu->arch.pc;
er = update_pc(vcpu, cause);
if (er == EMULATE_FAIL)
return er;
base = inst.i_format.rs;
op_inst = inst.i_format.rt;
if (cpu_has_mips_r6)
offset = inst.spec3_format.simmediate;
else
offset = inst.i_format.simmediate;
cache = op_inst & CacheOp_Cache;
op = op_inst & CacheOp_Op;
va = arch->gprs[base] + offset;
kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
cache, op, base, arch->gprs[base], offset);
/* Secondary or tirtiary cache ops ignored */
if (cache != Cache_I && cache != Cache_D)
return EMULATE_DONE;
switch (op_inst) {
case Index_Invalidate_I:
flush_icache_line_indexed(va);
return EMULATE_DONE;
case Index_Writeback_Inv_D:
flush_dcache_line_indexed(va);
return EMULATE_DONE;
case Hit_Invalidate_I:
case Hit_Invalidate_D:
case Hit_Writeback_Inv_D:
if (boot_cpu_type() == CPU_CAVIUM_OCTEON3) {
/* We can just flush entire icache */
local_flush_icache_range(0, 0);
return EMULATE_DONE;
}
/* So far, other platforms support guest hit cache ops */
break;
default:
break;
}
kvm_err("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
curr_pc, vcpu->arch.gprs[31], cache, op, base, arch->gprs[base],
offset);
/* Rollback PC */
vcpu->arch.pc = curr_pc;
return EMULATE_FAIL;
}
#ifdef CONFIG_CPU_LOONGSON64
static enum emulation_result kvm_vz_gpsi_lwc2(union mips_instruction inst,
u32 *opc, u32 cause,
struct kvm_vcpu *vcpu)
{
unsigned int rs, rd;
unsigned int hostcfg;
unsigned long curr_pc;
enum emulation_result er = EMULATE_DONE;
/*
* Update PC and hold onto current PC in case there is
* an error and we want to rollback the PC
*/
curr_pc = vcpu->arch.pc;
er = update_pc(vcpu, cause);
if (er == EMULATE_FAIL)
return er;
rs = inst.loongson3_lscsr_format.rs;
rd = inst.loongson3_lscsr_format.rd;
switch (inst.loongson3_lscsr_format.fr) {
case 0x8: /* Read CPUCFG */
++vcpu->stat.vz_cpucfg_exits;
hostcfg = read_cpucfg(vcpu->arch.gprs[rs]);
switch (vcpu->arch.gprs[rs]) {
case LOONGSON_CFG0:
vcpu->arch.gprs[rd] = 0x14c000;
break;
case LOONGSON_CFG1:
hostcfg &= (LOONGSON_CFG1_FP | LOONGSON_CFG1_MMI |
LOONGSON_CFG1_MSA1 | LOONGSON_CFG1_MSA2 |
LOONGSON_CFG1_SFBP);
vcpu->arch.gprs[rd] = hostcfg;
break;
case LOONGSON_CFG2:
hostcfg &= (LOONGSON_CFG2_LEXT1 | LOONGSON_CFG2_LEXT2 |
LOONGSON_CFG2_LEXT3 | LOONGSON_CFG2_LSPW);
vcpu->arch.gprs[rd] = hostcfg;
break;
case LOONGSON_CFG3:
vcpu->arch.gprs[rd] = hostcfg;
break;
default:
/* Don't export any other advanced features to guest */
vcpu->arch.gprs[rd] = 0;
break;
}
break;
default:
kvm_err("lwc2 emulate not impl %d rs %lx @%lx\n",
inst.loongson3_lscsr_format.fr, vcpu->arch.gprs[rs], curr_pc);
er = EMULATE_FAIL;
break;
}
/* Rollback PC only if emulation was unsuccessful */
if (er == EMULATE_FAIL) {
kvm_err("[%#lx]%s: unsupported lwc2 instruction 0x%08x 0x%08x\n",
curr_pc, __func__, inst.word, inst.loongson3_lscsr_format.fr);
vcpu->arch.pc = curr_pc;
}
return er;
}
#endif
static enum emulation_result kvm_trap_vz_handle_gpsi(u32 cause, u32 *opc,
struct kvm_vcpu *vcpu)
{
enum emulation_result er = EMULATE_DONE;
struct kvm_vcpu_arch *arch = &vcpu->arch;
union mips_instruction inst;
int rd, rt, sel;
int err;
/*
* Fetch the instruction.
*/
if (cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err)
return EMULATE_FAIL;
switch (inst.r_format.opcode) {
case cop0_op:
er = kvm_vz_gpsi_cop0(inst, opc, cause, vcpu);
break;
#ifndef CONFIG_CPU_MIPSR6
case cache_op:
trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
er = kvm_vz_gpsi_cache(inst, opc, cause, vcpu);
break;
#endif
#ifdef CONFIG_CPU_LOONGSON64
case lwc2_op:
er = kvm_vz_gpsi_lwc2(inst, opc, cause, vcpu);
break;
#endif
case spec3_op:
switch (inst.spec3_format.func) {
#ifdef CONFIG_CPU_MIPSR6
case cache6_op:
trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
er = kvm_vz_gpsi_cache(inst, opc, cause, vcpu);
break;
#endif
case rdhwr_op:
if (inst.r_format.rs || (inst.r_format.re >> 3))
goto unknown;
rd = inst.r_format.rd;
rt = inst.r_format.rt;
sel = inst.r_format.re & 0x7;
switch (rd) {
case MIPS_HWR_CC: /* Read count register */
arch->gprs[rt] =
(long)(int)kvm_mips_read_count(vcpu);
break;
default:
trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
KVM_TRACE_HWR(rd, sel), 0);
goto unknown;
}
trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
KVM_TRACE_HWR(rd, sel), arch->gprs[rt]);
er = update_pc(vcpu, cause);
break;
default:
goto unknown;
}
break;
unknown:
default:
kvm_err("GPSI exception not supported (%p/%#x)\n",
opc, inst.word);
kvm_arch_vcpu_dump_regs(vcpu);
er = EMULATE_FAIL;
break;
}
return er;
}
static enum emulation_result kvm_trap_vz_handle_gsfc(u32 cause, u32 *opc,
struct kvm_vcpu *vcpu)
{
enum emulation_result er = EMULATE_DONE;
struct kvm_vcpu_arch *arch = &vcpu->arch;
union mips_instruction inst;
int err;
/*
* Fetch the instruction.
*/
if (cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err)
return EMULATE_FAIL;
/* complete MTC0 on behalf of guest and advance EPC */
if (inst.c0r_format.opcode == cop0_op &&
inst.c0r_format.rs == mtc_op &&
inst.c0r_format.z == 0) {
int rt = inst.c0r_format.rt;
int rd = inst.c0r_format.rd;
int sel = inst.c0r_format.sel;
unsigned int val = arch->gprs[rt];
unsigned int old_val, change;
trace_kvm_hwr(vcpu, KVM_TRACE_MTC0, KVM_TRACE_COP0(rd, sel),
val);
if ((rd == MIPS_CP0_STATUS) && (sel == 0)) {
/* FR bit should read as zero if no FPU */
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
val &= ~(ST0_CU1 | ST0_FR);
/*
* Also don't allow FR to be set if host doesn't support
* it.
*/
if (!(boot_cpu_data.fpu_id & MIPS_FPIR_F64))
val &= ~ST0_FR;
old_val = read_gc0_status();
change = val ^ old_val;
if (change & ST0_FR) {
/*
* FPU and Vector register state is made
* UNPREDICTABLE by a change of FR, so don't
* even bother saving it.
*/
kvm_drop_fpu(vcpu);
}
/*
* If MSA state is already live, it is undefined how it
* interacts with FR=0 FPU state, and we don't want to
* hit reserved instruction exceptions trying to save
* the MSA state later when CU=1 && FR=1, so play it
* safe and save it first.
*/
if (change & ST0_CU1 && !(val & ST0_FR) &&
vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA)
kvm_lose_fpu(vcpu);
write_gc0_status(val);
} else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) {
u32 old_cause = read_gc0_cause();
u32 change = old_cause ^ val;
/* DC bit enabling/disabling timer? */
if (change & CAUSEF_DC) {
if (val & CAUSEF_DC) {
kvm_vz_lose_htimer(vcpu);
kvm_mips_count_disable_cause(vcpu);
} else {
kvm_mips_count_enable_cause(vcpu);
}
}
/* Only certain bits are RW to the guest */
change &= (CAUSEF_DC | CAUSEF_IV | CAUSEF_WP |
CAUSEF_IP0 | CAUSEF_IP1);
/* WP can only be cleared */
change &= ~CAUSEF_WP | old_cause;
write_gc0_cause(old_cause ^ change);
} else if ((rd == MIPS_CP0_STATUS) && (sel == 1)) { /* IntCtl */
write_gc0_intctl(val);
} else if ((rd == MIPS_CP0_CONFIG) && (sel == 5)) {
old_val = read_gc0_config5();
change = val ^ old_val;
/* Handle changes in FPU/MSA modes */
preempt_disable();
/*
* Propagate FRE changes immediately if the FPU
* context is already loaded.
*/
if (change & MIPS_CONF5_FRE &&
vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)
change_c0_config5(MIPS_CONF5_FRE, val);
preempt_enable();
val = old_val ^
(change & kvm_vz_config5_guest_wrmask(vcpu));
write_gc0_config5(val);
} else {
kvm_err("Handle GSFC, unsupported field change @ %p: %#x\n",
opc, inst.word);
er = EMULATE_FAIL;
}
if (er != EMULATE_FAIL)
er = update_pc(vcpu, cause);
} else {
kvm_err("Handle GSFC, unrecognized instruction @ %p: %#x\n",
opc, inst.word);
er = EMULATE_FAIL;
}
return er;
}
static enum emulation_result kvm_trap_vz_handle_ghfc(u32 cause, u32 *opc,
struct kvm_vcpu *vcpu)
{
/*
* Presumably this is due to MC (guest mode change), so lets trace some
* relevant info.
*/
trace_kvm_guest_mode_change(vcpu);
return EMULATE_DONE;
}
static enum emulation_result kvm_trap_vz_handle_hc(u32 cause, u32 *opc,
struct kvm_vcpu *vcpu)
{
enum emulation_result er;
union mips_instruction inst;
unsigned long curr_pc;
int err;
if (cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err)
return EMULATE_FAIL;
/*
* Update PC and hold onto current PC in case there is
* an error and we want to rollback the PC
*/
curr_pc = vcpu->arch.pc;
er = update_pc(vcpu, cause);
if (er == EMULATE_FAIL)
return er;
er = kvm_mips_emul_hypcall(vcpu, inst);
if (er == EMULATE_FAIL)
vcpu->arch.pc = curr_pc;
return er;
}
static enum emulation_result kvm_trap_vz_no_handler_guest_exit(u32 gexccode,
u32 cause,
u32 *opc,
struct kvm_vcpu *vcpu)
{
u32 inst;
/*
* Fetch the instruction.
*/
if (cause & CAUSEF_BD)
opc += 1;
kvm_get_badinstr(opc, vcpu, &inst);
kvm_err("Guest Exception Code: %d not yet handled @ PC: %p, inst: 0x%08x Status: %#x\n",
gexccode, opc, inst, read_gc0_status());
return EMULATE_FAIL;
}
static int kvm_trap_vz_handle_guest_exit(struct kvm_vcpu *vcpu)
{
u32 *opc = (u32 *) vcpu->arch.pc;
u32 cause = vcpu->arch.host_cp0_cause;
enum emulation_result er = EMULATE_DONE;
u32 gexccode = (vcpu->arch.host_cp0_guestctl0 &
MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
int ret = RESUME_GUEST;
trace_kvm_exit(vcpu, KVM_TRACE_EXIT_GEXCCODE_BASE + gexccode);
switch (gexccode) {
case MIPS_GCTL0_GEXC_GPSI:
++vcpu->stat.vz_gpsi_exits;
er = kvm_trap_vz_handle_gpsi(cause, opc, vcpu);
break;
case MIPS_GCTL0_GEXC_GSFC:
++vcpu->stat.vz_gsfc_exits;
er = kvm_trap_vz_handle_gsfc(cause, opc, vcpu);
break;
case MIPS_GCTL0_GEXC_HC:
++vcpu->stat.vz_hc_exits;
er = kvm_trap_vz_handle_hc(cause, opc, vcpu);
break;
case MIPS_GCTL0_GEXC_GRR:
++vcpu->stat.vz_grr_exits;
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
vcpu);
break;
case MIPS_GCTL0_GEXC_GVA:
++vcpu->stat.vz_gva_exits;
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
vcpu);
break;
case MIPS_GCTL0_GEXC_GHFC:
++vcpu->stat.vz_ghfc_exits;
er = kvm_trap_vz_handle_ghfc(cause, opc, vcpu);
break;
case MIPS_GCTL0_GEXC_GPA:
++vcpu->stat.vz_gpa_exits;
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
vcpu);
break;
default:
++vcpu->stat.vz_resvd_exits;
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
vcpu);
break;
}
if (er == EMULATE_DONE) {
ret = RESUME_GUEST;
} else if (er == EMULATE_HYPERCALL) {
ret = kvm_mips_handle_hypcall(vcpu);
} else {
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
}
return ret;
}
/**
* kvm_trap_vz_handle_cop_unusable() - Guest used unusable coprocessor.
* @vcpu: Virtual CPU context.
*
* Handle when the guest attempts to use a coprocessor which hasn't been allowed
* by the root context.
*
* Return: value indicating whether to resume the host or the guest
* (RESUME_HOST or RESUME_GUEST)
*/
static int kvm_trap_vz_handle_cop_unusable(struct kvm_vcpu *vcpu)
{
u32 cause = vcpu->arch.host_cp0_cause;
enum emulation_result er = EMULATE_FAIL;
int ret = RESUME_GUEST;
if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) {
/*
* If guest FPU not present, the FPU operation should have been
* treated as a reserved instruction!
* If FPU already in use, we shouldn't get this at all.
*/
if (WARN_ON(!kvm_mips_guest_has_fpu(&vcpu->arch) ||
vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) {
preempt_enable();
return EMULATE_FAIL;
}
kvm_own_fpu(vcpu);
er = EMULATE_DONE;
}
/* other coprocessors not handled */
switch (er) {
case EMULATE_DONE:
ret = RESUME_GUEST;
break;
case EMULATE_FAIL:
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
break;
default:
BUG();
}
return ret;
}
/**
* kvm_trap_vz_handle_msa_disabled() - Guest used MSA while disabled in root.
* @vcpu: Virtual CPU context.
*
* Handle when the guest attempts to use MSA when it is disabled in the root
* context.
*
* Return: value indicating whether to resume the host or the guest
* (RESUME_HOST or RESUME_GUEST)
*/
static int kvm_trap_vz_handle_msa_disabled(struct kvm_vcpu *vcpu)
{
/*
* If MSA not present or not exposed to guest or FR=0, the MSA operation
* should have been treated as a reserved instruction!
* Same if CU1=1, FR=0.
* If MSA already in use, we shouldn't get this at all.
*/
if (!kvm_mips_guest_has_msa(&vcpu->arch) ||
(read_gc0_status() & (ST0_CU1 | ST0_FR)) == ST0_CU1 ||
!(read_gc0_config5() & MIPS_CONF5_MSAEN) ||
vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) {
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
kvm_own_msa(vcpu);
return RESUME_GUEST;
}
static int kvm_trap_vz_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
u32 *opc = (u32 *) vcpu->arch.pc;
u32 cause = vcpu->arch.host_cp0_cause;
ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
union mips_instruction inst;
enum emulation_result er = EMULATE_DONE;
int err, ret = RESUME_GUEST;
if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, false)) {
/* A code fetch fault doesn't count as an MMIO */
if (kvm_is_ifetch_fault(&vcpu->arch)) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
/* Fetch the instruction */
if (cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
/* Treat as MMIO */
er = kvm_mips_emulate_load(inst, cause, vcpu);
if (er == EMULATE_FAIL) {
kvm_err("Guest Emulate Load from MMIO space failed: PC: %p, BadVaddr: %#lx\n",
opc, badvaddr);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
}
}
if (er == EMULATE_DONE) {
ret = RESUME_GUEST;
} else if (er == EMULATE_DO_MMIO) {
run->exit_reason = KVM_EXIT_MMIO;
ret = RESUME_HOST;
} else {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
}
return ret;
}
static int kvm_trap_vz_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
u32 *opc = (u32 *) vcpu->arch.pc;
u32 cause = vcpu->arch.host_cp0_cause;
ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
union mips_instruction inst;
enum emulation_result er = EMULATE_DONE;
int err;
int ret = RESUME_GUEST;
/* Just try the access again if we couldn't do the translation */
if (kvm_vz_badvaddr_to_gpa(vcpu, badvaddr, &badvaddr))
return RESUME_GUEST;
vcpu->arch.host_cp0_badvaddr = badvaddr;
if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, true)) {
/* Fetch the instruction */
if (cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
/* Treat as MMIO */
er = kvm_mips_emulate_store(inst, cause, vcpu);
if (er == EMULATE_FAIL) {
kvm_err("Guest Emulate Store to MMIO space failed: PC: %p, BadVaddr: %#lx\n",
opc, badvaddr);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
}
}
if (er == EMULATE_DONE) {
ret = RESUME_GUEST;
} else if (er == EMULATE_DO_MMIO) {
run->exit_reason = KVM_EXIT_MMIO;
ret = RESUME_HOST;
} else {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
}
return ret;
}
static u64 kvm_vz_get_one_regs[] = {
KVM_REG_MIPS_CP0_INDEX,
KVM_REG_MIPS_CP0_ENTRYLO0,
KVM_REG_MIPS_CP0_ENTRYLO1,
KVM_REG_MIPS_CP0_CONTEXT,
KVM_REG_MIPS_CP0_PAGEMASK,
KVM_REG_MIPS_CP0_PAGEGRAIN,
KVM_REG_MIPS_CP0_WIRED,
KVM_REG_MIPS_CP0_HWRENA,
KVM_REG_MIPS_CP0_BADVADDR,
KVM_REG_MIPS_CP0_COUNT,
KVM_REG_MIPS_CP0_ENTRYHI,
KVM_REG_MIPS_CP0_COMPARE,
KVM_REG_MIPS_CP0_STATUS,
KVM_REG_MIPS_CP0_INTCTL,
KVM_REG_MIPS_CP0_CAUSE,
KVM_REG_MIPS_CP0_EPC,
KVM_REG_MIPS_CP0_PRID,
KVM_REG_MIPS_CP0_EBASE,
KVM_REG_MIPS_CP0_CONFIG,
KVM_REG_MIPS_CP0_CONFIG1,
KVM_REG_MIPS_CP0_CONFIG2,
KVM_REG_MIPS_CP0_CONFIG3,
KVM_REG_MIPS_CP0_CONFIG4,
KVM_REG_MIPS_CP0_CONFIG5,
KVM_REG_MIPS_CP0_CONFIG6,
#ifdef CONFIG_64BIT
KVM_REG_MIPS_CP0_XCONTEXT,
#endif
KVM_REG_MIPS_CP0_ERROREPC,
KVM_REG_MIPS_COUNT_CTL,
KVM_REG_MIPS_COUNT_RESUME,
KVM_REG_MIPS_COUNT_HZ,
};
static u64 kvm_vz_get_one_regs_contextconfig[] = {
KVM_REG_MIPS_CP0_CONTEXTCONFIG,
#ifdef CONFIG_64BIT
KVM_REG_MIPS_CP0_XCONTEXTCONFIG,
#endif
};
static u64 kvm_vz_get_one_regs_segments[] = {
KVM_REG_MIPS_CP0_SEGCTL0,
KVM_REG_MIPS_CP0_SEGCTL1,
KVM_REG_MIPS_CP0_SEGCTL2,
};
static u64 kvm_vz_get_one_regs_htw[] = {
KVM_REG_MIPS_CP0_PWBASE,
KVM_REG_MIPS_CP0_PWFIELD,
KVM_REG_MIPS_CP0_PWSIZE,
KVM_REG_MIPS_CP0_PWCTL,
};
static u64 kvm_vz_get_one_regs_kscratch[] = {
KVM_REG_MIPS_CP0_KSCRATCH1,
KVM_REG_MIPS_CP0_KSCRATCH2,
KVM_REG_MIPS_CP0_KSCRATCH3,
KVM_REG_MIPS_CP0_KSCRATCH4,
KVM_REG_MIPS_CP0_KSCRATCH5,
KVM_REG_MIPS_CP0_KSCRATCH6,
};
static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu)
{
unsigned long ret;
ret = ARRAY_SIZE(kvm_vz_get_one_regs);
if (cpu_guest_has_userlocal)
++ret;
if (cpu_guest_has_badinstr)
++ret;
if (cpu_guest_has_badinstrp)
++ret;
if (cpu_guest_has_contextconfig)
ret += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
if (cpu_guest_has_segments)
ret += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
if (cpu_guest_has_htw || cpu_guest_has_ldpte)
ret += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar)
ret += 1 + ARRAY_SIZE(vcpu->arch.maar);
ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask);
return ret;
}
static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
{
u64 index;
unsigned int i;
if (copy_to_user(indices, kvm_vz_get_one_regs,
sizeof(kvm_vz_get_one_regs)))
return -EFAULT;
indices += ARRAY_SIZE(kvm_vz_get_one_regs);
if (cpu_guest_has_userlocal) {
index = KVM_REG_MIPS_CP0_USERLOCAL;
if (copy_to_user(indices, &index, sizeof(index)))
return -EFAULT;
++indices;
}
if (cpu_guest_has_badinstr) {
index = KVM_REG_MIPS_CP0_BADINSTR;
if (copy_to_user(indices, &index, sizeof(index)))
return -EFAULT;
++indices;
}
if (cpu_guest_has_badinstrp) {
index = KVM_REG_MIPS_CP0_BADINSTRP;
if (copy_to_user(indices, &index, sizeof(index)))
return -EFAULT;
++indices;
}
if (cpu_guest_has_contextconfig) {
if (copy_to_user(indices, kvm_vz_get_one_regs_contextconfig,
sizeof(kvm_vz_get_one_regs_contextconfig)))
return -EFAULT;
indices += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
}
if (cpu_guest_has_segments) {
if (copy_to_user(indices, kvm_vz_get_one_regs_segments,
sizeof(kvm_vz_get_one_regs_segments)))
return -EFAULT;
indices += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
}
if (cpu_guest_has_htw || cpu_guest_has_ldpte) {
if (copy_to_user(indices, kvm_vz_get_one_regs_htw,
sizeof(kvm_vz_get_one_regs_htw)))
return -EFAULT;
indices += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
}
if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar) {
for (i = 0; i < ARRAY_SIZE(vcpu->arch.maar); ++i) {
index = KVM_REG_MIPS_CP0_MAAR(i);
if (copy_to_user(indices, &index, sizeof(index)))
return -EFAULT;
++indices;
}
index = KVM_REG_MIPS_CP0_MAARI;
if (copy_to_user(indices, &index, sizeof(index)))
return -EFAULT;
++indices;
}
for (i = 0; i < 6; ++i) {
if (!cpu_guest_has_kscr(i + 2))
continue;
if (copy_to_user(indices, &kvm_vz_get_one_regs_kscratch[i],
sizeof(kvm_vz_get_one_regs_kscratch[i])))
return -EFAULT;
++indices;
}
return 0;
}
static inline s64 entrylo_kvm_to_user(unsigned long v)
{
s64 mask, ret = v;
if (BITS_PER_LONG == 32) {
/*
* KVM API exposes 64-bit version of the register, so move the
* RI/XI bits up into place.
*/
mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
ret &= ~mask;
ret |= ((s64)v & mask) << 32;
}
return ret;
}
static inline unsigned long entrylo_user_to_kvm(s64 v)
{
unsigned long mask, ret = v;
if (BITS_PER_LONG == 32) {
/*
* KVM API exposes 64-bit versiono of the register, so move the
* RI/XI bits down into place.
*/
mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
ret &= ~mask;
ret |= (v >> 32) & mask;
}
return ret;
}
static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg,
s64 *v)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
unsigned int idx;
switch (reg->id) {
case KVM_REG_MIPS_CP0_INDEX:
*v = (long)read_gc0_index();
break;
case KVM_REG_MIPS_CP0_ENTRYLO0:
*v = entrylo_kvm_to_user(read_gc0_entrylo0());
break;
case KVM_REG_MIPS_CP0_ENTRYLO1:
*v = entrylo_kvm_to_user(read_gc0_entrylo1());
break;
case KVM_REG_MIPS_CP0_CONTEXT:
*v = (long)read_gc0_context();
break;
case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
if (!cpu_guest_has_contextconfig)
return -EINVAL;
*v = read_gc0_contextconfig();
break;
case KVM_REG_MIPS_CP0_USERLOCAL:
if (!cpu_guest_has_userlocal)
return -EINVAL;
*v = read_gc0_userlocal();
break;
#ifdef CONFIG_64BIT
case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
if (!cpu_guest_has_contextconfig)
return -EINVAL;
*v = read_gc0_xcontextconfig();
break;
#endif
case KVM_REG_MIPS_CP0_PAGEMASK:
*v = (long)read_gc0_pagemask();
break;
case KVM_REG_MIPS_CP0_PAGEGRAIN:
*v = (long)read_gc0_pagegrain();
break;
case KVM_REG_MIPS_CP0_SEGCTL0:
if (!cpu_guest_has_segments)
return -EINVAL;
*v = read_gc0_segctl0();
break;
case KVM_REG_MIPS_CP0_SEGCTL1:
if (!cpu_guest_has_segments)
return -EINVAL;
*v = read_gc0_segctl1();
break;
case KVM_REG_MIPS_CP0_SEGCTL2:
if (!cpu_guest_has_segments)
return -EINVAL;
*v = read_gc0_segctl2();
break;
case KVM_REG_MIPS_CP0_PWBASE:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
*v = read_gc0_pwbase();
break;
case KVM_REG_MIPS_CP0_PWFIELD:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
*v = read_gc0_pwfield();
break;
case KVM_REG_MIPS_CP0_PWSIZE:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
*v = read_gc0_pwsize();
break;
case KVM_REG_MIPS_CP0_WIRED:
*v = (long)read_gc0_wired();
break;
case KVM_REG_MIPS_CP0_PWCTL:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
*v = read_gc0_pwctl();
break;
case KVM_REG_MIPS_CP0_HWRENA:
*v = (long)read_gc0_hwrena();
break;
case KVM_REG_MIPS_CP0_BADVADDR:
*v = (long)read_gc0_badvaddr();
break;
case KVM_REG_MIPS_CP0_BADINSTR:
if (!cpu_guest_has_badinstr)
return -EINVAL;
*v = read_gc0_badinstr();
break;
case KVM_REG_MIPS_CP0_BADINSTRP:
if (!cpu_guest_has_badinstrp)
return -EINVAL;
*v = read_gc0_badinstrp();
break;
case KVM_REG_MIPS_CP0_COUNT:
*v = kvm_mips_read_count(vcpu);
break;
case KVM_REG_MIPS_CP0_ENTRYHI:
*v = (long)read_gc0_entryhi();
break;
case KVM_REG_MIPS_CP0_COMPARE:
*v = (long)read_gc0_compare();
break;
case KVM_REG_MIPS_CP0_STATUS:
*v = (long)read_gc0_status();
break;
case KVM_REG_MIPS_CP0_INTCTL:
*v = read_gc0_intctl();
break;
case KVM_REG_MIPS_CP0_CAUSE:
*v = (long)read_gc0_cause();
break;
case KVM_REG_MIPS_CP0_EPC:
*v = (long)read_gc0_epc();
break;
case KVM_REG_MIPS_CP0_PRID:
switch (boot_cpu_type()) {
case CPU_CAVIUM_OCTEON3:
/* Octeon III has a read-only guest.PRid */
*v = read_gc0_prid();
break;
default:
*v = (long)kvm_read_c0_guest_prid(cop0);
break;
}
break;
case KVM_REG_MIPS_CP0_EBASE:
*v = kvm_vz_read_gc0_ebase();
break;
case KVM_REG_MIPS_CP0_CONFIG:
*v = read_gc0_config();
break;
case KVM_REG_MIPS_CP0_CONFIG1:
if (!cpu_guest_has_conf1)
return -EINVAL;
*v = read_gc0_config1();
break;
case KVM_REG_MIPS_CP0_CONFIG2:
if (!cpu_guest_has_conf2)
return -EINVAL;
*v = read_gc0_config2();
break;
case KVM_REG_MIPS_CP0_CONFIG3:
if (!cpu_guest_has_conf3)
return -EINVAL;
*v = read_gc0_config3();
break;
case KVM_REG_MIPS_CP0_CONFIG4:
if (!cpu_guest_has_conf4)
return -EINVAL;
*v = read_gc0_config4();
break;
case KVM_REG_MIPS_CP0_CONFIG5:
if (!cpu_guest_has_conf5)
return -EINVAL;
*v = read_gc0_config5();
break;
case KVM_REG_MIPS_CP0_CONFIG6:
*v = kvm_read_sw_gc0_config6(cop0);
break;
case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
return -EINVAL;
idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
if (idx >= ARRAY_SIZE(vcpu->arch.maar))
return -EINVAL;
*v = vcpu->arch.maar[idx];
break;
case KVM_REG_MIPS_CP0_MAARI:
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
return -EINVAL;
*v = kvm_read_sw_gc0_maari(vcpu->arch.cop0);
break;
#ifdef CONFIG_64BIT
case KVM_REG_MIPS_CP0_XCONTEXT:
*v = read_gc0_xcontext();
break;
#endif
case KVM_REG_MIPS_CP0_ERROREPC:
*v = (long)read_gc0_errorepc();
break;
case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
if (!cpu_guest_has_kscr(idx))
return -EINVAL;
switch (idx) {
case 2:
*v = (long)read_gc0_kscratch1();
break;
case 3:
*v = (long)read_gc0_kscratch2();
break;
case 4:
*v = (long)read_gc0_kscratch3();
break;
case 5:
*v = (long)read_gc0_kscratch4();
break;
case 6:
*v = (long)read_gc0_kscratch5();
break;
case 7:
*v = (long)read_gc0_kscratch6();
break;
}
break;
case KVM_REG_MIPS_COUNT_CTL:
*v = vcpu->arch.count_ctl;
break;
case KVM_REG_MIPS_COUNT_RESUME:
*v = ktime_to_ns(vcpu->arch.count_resume);
break;
case KVM_REG_MIPS_COUNT_HZ:
*v = vcpu->arch.count_hz;
break;
default:
return -EINVAL;
}
return 0;
}
static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg,
s64 v)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
unsigned int idx;
int ret = 0;
unsigned int cur, change;
switch (reg->id) {
case KVM_REG_MIPS_CP0_INDEX:
write_gc0_index(v);
break;
case KVM_REG_MIPS_CP0_ENTRYLO0:
write_gc0_entrylo0(entrylo_user_to_kvm(v));
break;
case KVM_REG_MIPS_CP0_ENTRYLO1:
write_gc0_entrylo1(entrylo_user_to_kvm(v));
break;
case KVM_REG_MIPS_CP0_CONTEXT:
write_gc0_context(v);
break;
case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
if (!cpu_guest_has_contextconfig)
return -EINVAL;
write_gc0_contextconfig(v);
break;
case KVM_REG_MIPS_CP0_USERLOCAL:
if (!cpu_guest_has_userlocal)
return -EINVAL;
write_gc0_userlocal(v);
break;
#ifdef CONFIG_64BIT
case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
if (!cpu_guest_has_contextconfig)
return -EINVAL;
write_gc0_xcontextconfig(v);
break;
#endif
case KVM_REG_MIPS_CP0_PAGEMASK:
write_gc0_pagemask(v);
break;
case KVM_REG_MIPS_CP0_PAGEGRAIN:
write_gc0_pagegrain(v);
break;
case KVM_REG_MIPS_CP0_SEGCTL0:
if (!cpu_guest_has_segments)
return -EINVAL;
write_gc0_segctl0(v);
break;
case KVM_REG_MIPS_CP0_SEGCTL1:
if (!cpu_guest_has_segments)
return -EINVAL;
write_gc0_segctl1(v);
break;
case KVM_REG_MIPS_CP0_SEGCTL2:
if (!cpu_guest_has_segments)
return -EINVAL;
write_gc0_segctl2(v);
break;
case KVM_REG_MIPS_CP0_PWBASE:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
write_gc0_pwbase(v);
break;
case KVM_REG_MIPS_CP0_PWFIELD:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
write_gc0_pwfield(v);
break;
case KVM_REG_MIPS_CP0_PWSIZE:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
write_gc0_pwsize(v);
break;
case KVM_REG_MIPS_CP0_WIRED:
change_gc0_wired(MIPSR6_WIRED_WIRED, v);
break;
case KVM_REG_MIPS_CP0_PWCTL:
if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
return -EINVAL;
write_gc0_pwctl(v);
break;
case KVM_REG_MIPS_CP0_HWRENA:
write_gc0_hwrena(v);
break;
case KVM_REG_MIPS_CP0_BADVADDR:
write_gc0_badvaddr(v);
break;
case KVM_REG_MIPS_CP0_BADINSTR:
if (!cpu_guest_has_badinstr)
return -EINVAL;
write_gc0_badinstr(v);
break;
case KVM_REG_MIPS_CP0_BADINSTRP:
if (!cpu_guest_has_badinstrp)
return -EINVAL;
write_gc0_badinstrp(v);
break;
case KVM_REG_MIPS_CP0_COUNT:
kvm_mips_write_count(vcpu, v);
break;
case KVM_REG_MIPS_CP0_ENTRYHI:
write_gc0_entryhi(v);
break;
case KVM_REG_MIPS_CP0_COMPARE:
kvm_mips_write_compare(vcpu, v, false);
break;
case KVM_REG_MIPS_CP0_STATUS:
write_gc0_status(v);
break;
case KVM_REG_MIPS_CP0_INTCTL:
write_gc0_intctl(v);
break;
case KVM_REG_MIPS_CP0_CAUSE:
/*
* If the timer is stopped or started (DC bit) it must look
* atomic with changes to the timer interrupt pending bit (TI).
* A timer interrupt should not happen in between.
*/
if ((read_gc0_cause() ^ v) & CAUSEF_DC) {
if (v & CAUSEF_DC) {
/* disable timer first */
kvm_mips_count_disable_cause(vcpu);
change_gc0_cause((u32)~CAUSEF_DC, v);
} else {
/* enable timer last */
change_gc0_cause((u32)~CAUSEF_DC, v);
kvm_mips_count_enable_cause(vcpu);
}
} else {
write_gc0_cause(v);
}
break;
case KVM_REG_MIPS_CP0_EPC:
write_gc0_epc(v);
break;
case KVM_REG_MIPS_CP0_PRID:
switch (boot_cpu_type()) {
case CPU_CAVIUM_OCTEON3:
/* Octeon III has a guest.PRid, but its read-only */
break;
default:
kvm_write_c0_guest_prid(cop0, v);
break;
}
break;
case KVM_REG_MIPS_CP0_EBASE:
kvm_vz_write_gc0_ebase(v);
break;
case KVM_REG_MIPS_CP0_CONFIG:
cur = read_gc0_config();
change = (cur ^ v) & kvm_vz_config_user_wrmask(vcpu);
if (change) {
v = cur ^ change;
write_gc0_config(v);
}
break;
case KVM_REG_MIPS_CP0_CONFIG1:
if (!cpu_guest_has_conf1)
break;
cur = read_gc0_config1();
change = (cur ^ v) & kvm_vz_config1_user_wrmask(vcpu);
if (change) {
v = cur ^ change;
write_gc0_config1(v);
}
break;
case KVM_REG_MIPS_CP0_CONFIG2:
if (!cpu_guest_has_conf2)
break;
cur = read_gc0_config2();
change = (cur ^ v) & kvm_vz_config2_user_wrmask(vcpu);
if (change) {
v = cur ^ change;
write_gc0_config2(v);
}
break;
case KVM_REG_MIPS_CP0_CONFIG3:
if (!cpu_guest_has_conf3)
break;
cur = read_gc0_config3();
change = (cur ^ v) & kvm_vz_config3_user_wrmask(vcpu);
if (change) {
v = cur ^ change;
write_gc0_config3(v);
}
break;
case KVM_REG_MIPS_CP0_CONFIG4:
if (!cpu_guest_has_conf4)
break;
cur = read_gc0_config4();
change = (cur ^ v) & kvm_vz_config4_user_wrmask(vcpu);
if (change) {
v = cur ^ change;
write_gc0_config4(v);
}
break;
case KVM_REG_MIPS_CP0_CONFIG5:
if (!cpu_guest_has_conf5)
break;
cur = read_gc0_config5();
change = (cur ^ v) & kvm_vz_config5_user_wrmask(vcpu);
if (change) {
v = cur ^ change;
write_gc0_config5(v);
}
break;
case KVM_REG_MIPS_CP0_CONFIG6:
cur = kvm_read_sw_gc0_config6(cop0);
change = (cur ^ v) & kvm_vz_config6_user_wrmask(vcpu);
if (change) {
v = cur ^ change;
kvm_write_sw_gc0_config6(cop0, (int)v);
}
break;
case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
return -EINVAL;
idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
if (idx >= ARRAY_SIZE(vcpu->arch.maar))
return -EINVAL;
vcpu->arch.maar[idx] = mips_process_maar(dmtc_op, v);
break;
case KVM_REG_MIPS_CP0_MAARI:
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
return -EINVAL;
kvm_write_maari(vcpu, v);
break;
#ifdef CONFIG_64BIT
case KVM_REG_MIPS_CP0_XCONTEXT:
write_gc0_xcontext(v);
break;
#endif
case KVM_REG_MIPS_CP0_ERROREPC:
write_gc0_errorepc(v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
if (!cpu_guest_has_kscr(idx))
return -EINVAL;
switch (idx) {
case 2:
write_gc0_kscratch1(v);
break;
case 3:
write_gc0_kscratch2(v);
break;
case 4:
write_gc0_kscratch3(v);
break;
case 5:
write_gc0_kscratch4(v);
break;
case 6:
write_gc0_kscratch5(v);
break;
case 7:
write_gc0_kscratch6(v);
break;
}
break;
case KVM_REG_MIPS_COUNT_CTL:
ret = kvm_mips_set_count_ctl(vcpu, v);
break;
case KVM_REG_MIPS_COUNT_RESUME:
ret = kvm_mips_set_count_resume(vcpu, v);
break;
case KVM_REG_MIPS_COUNT_HZ:
ret = kvm_mips_set_count_hz(vcpu, v);
break;
default:
return -EINVAL;
}
return ret;
}
#define guestid_cache(cpu) (cpu_data[cpu].guestid_cache)
static void kvm_vz_get_new_guestid(unsigned long cpu, struct kvm_vcpu *vcpu)
{
unsigned long guestid = guestid_cache(cpu);
if (!(++guestid & GUESTID_MASK)) {
if (cpu_has_vtag_icache)
flush_icache_all();
if (!guestid) /* fix version if needed */
guestid = GUESTID_FIRST_VERSION;
++guestid; /* guestid 0 reserved for root */
/* start new guestid cycle */
kvm_vz_local_flush_roottlb_all_guests();
kvm_vz_local_flush_guesttlb_all();
}
guestid_cache(cpu) = guestid;
}
/* Returns 1 if the guest TLB may be clobbered */
static int kvm_vz_check_requests(struct kvm_vcpu *vcpu, int cpu)
{
int ret = 0;
int i;
if (!kvm_request_pending(vcpu))
return 0;
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
if (cpu_has_guestid) {
/* Drop all GuestIDs for this VCPU */
for_each_possible_cpu(i)
vcpu->arch.vzguestid[i] = 0;
/* This will clobber guest TLB contents too */
ret = 1;
}
/*
* For Root ASID Dealias (RAD) we don't do anything here, but we
* still need the request to ensure we recheck asid_flush_mask.
* We can still return 0 as only the root TLB will be affected
* by a root ASID flush.
*/
}
return ret;
}
static void kvm_vz_vcpu_save_wired(struct kvm_vcpu *vcpu)
{
unsigned int wired = read_gc0_wired();
struct kvm_mips_tlb *tlbs;
int i;
/* Expand the wired TLB array if necessary */
wired &= MIPSR6_WIRED_WIRED;
if (wired > vcpu->arch.wired_tlb_limit) {
tlbs = krealloc(vcpu->arch.wired_tlb, wired *
sizeof(*vcpu->arch.wired_tlb), GFP_ATOMIC);
if (WARN_ON(!tlbs)) {
/* Save whatever we can */
wired = vcpu->arch.wired_tlb_limit;
} else {
vcpu->arch.wired_tlb = tlbs;
vcpu->arch.wired_tlb_limit = wired;
}
}
if (wired)
/* Save wired entries from the guest TLB */
kvm_vz_save_guesttlb(vcpu->arch.wired_tlb, 0, wired);
/* Invalidate any dropped entries since last time */
for (i = wired; i < vcpu->arch.wired_tlb_used; ++i) {
vcpu->arch.wired_tlb[i].tlb_hi = UNIQUE_GUEST_ENTRYHI(i);
vcpu->arch.wired_tlb[i].tlb_lo[0] = 0;
vcpu->arch.wired_tlb[i].tlb_lo[1] = 0;
vcpu->arch.wired_tlb[i].tlb_mask = 0;
}
vcpu->arch.wired_tlb_used = wired;
}
static void kvm_vz_vcpu_load_wired(struct kvm_vcpu *vcpu)
{
/* Load wired entries into the guest TLB */
if (vcpu->arch.wired_tlb)
kvm_vz_load_guesttlb(vcpu->arch.wired_tlb, 0,
vcpu->arch.wired_tlb_used);
}
static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *vcpu, int cpu)
{
struct kvm *kvm = vcpu->kvm;
struct mm_struct *gpa_mm = &kvm->arch.gpa_mm;
bool migrated;
/*
* Are we entering guest context on a different CPU to last time?
* If so, the VCPU's guest TLB state on this CPU may be stale.
*/
migrated = (vcpu->arch.last_exec_cpu != cpu);
vcpu->arch.last_exec_cpu = cpu;
/*
* A vcpu's GuestID is set in GuestCtl1.ID when the vcpu is loaded and
* remains set until another vcpu is loaded in. As a rule GuestRID
* remains zeroed when in root context unless the kernel is busy
* manipulating guest tlb entries.
*/
if (cpu_has_guestid) {
/*
* Check if our GuestID is of an older version and thus invalid.
*
* We also discard the stored GuestID if we've executed on
* another CPU, as the guest mappings may have changed without
* hypervisor knowledge.
*/
if (migrated ||
(vcpu->arch.vzguestid[cpu] ^ guestid_cache(cpu)) &
GUESTID_VERSION_MASK) {
kvm_vz_get_new_guestid(cpu, vcpu);
vcpu->arch.vzguestid[cpu] = guestid_cache(cpu);
trace_kvm_guestid_change(vcpu,
vcpu->arch.vzguestid[cpu]);
}
/* Restore GuestID */
change_c0_guestctl1(GUESTID_MASK, vcpu->arch.vzguestid[cpu]);
} else {
/*
* The Guest TLB only stores a single guest's TLB state, so
* flush it if another VCPU has executed on this CPU.
*
* We also flush if we've executed on another CPU, as the guest
* mappings may have changed without hypervisor knowledge.
*/
if (migrated || last_exec_vcpu[cpu] != vcpu)
kvm_vz_local_flush_guesttlb_all();
last_exec_vcpu[cpu] = vcpu;
/*
* Root ASID dealiases guest GPA mappings in the root TLB.
* Allocate new root ASID if needed.
*/
if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask))
get_new_mmu_context(gpa_mm);
else
check_mmu_context(gpa_mm);
}
}
static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
bool migrated, all;
/*
* Have we migrated to a different CPU?
* If so, any old guest TLB state may be stale.
*/
migrated = (vcpu->arch.last_sched_cpu != cpu);
/*
* Was this the last VCPU to run on this CPU?
* If not, any old guest state from this VCPU will have been clobbered.
*/
all = migrated || (last_vcpu[cpu] != vcpu);
last_vcpu[cpu] = vcpu;
/*
* Restore CP0_Wired unconditionally as we clear it after use, and
* restore wired guest TLB entries (while in guest context).
*/
kvm_restore_gc0_wired(cop0);
if (current->flags & PF_VCPU) {
tlbw_use_hazard();
kvm_vz_vcpu_load_tlb(vcpu, cpu);
kvm_vz_vcpu_load_wired(vcpu);
}
/*
* Restore timer state regardless, as e.g. Cause.TI can change over time
* if left unmaintained.
*/
kvm_vz_restore_timer(vcpu);
/* Set MC bit if we want to trace guest mode changes */
if (kvm_trace_guest_mode_change)
set_c0_guestctl0(MIPS_GCTL0_MC);
else
clear_c0_guestctl0(MIPS_GCTL0_MC);
/* Don't bother restoring registers multiple times unless necessary */
if (!all)
return 0;
/*
* Restore config registers first, as some implementations restrict
* writes to other registers when the corresponding feature bits aren't
* set. For example Status.CU1 cannot be set unless Config1.FP is set.
*/
kvm_restore_gc0_config(cop0);
if (cpu_guest_has_conf1)
kvm_restore_gc0_config1(cop0);
if (cpu_guest_has_conf2)
kvm_restore_gc0_config2(cop0);
if (cpu_guest_has_conf3)
kvm_restore_gc0_config3(cop0);
if (cpu_guest_has_conf4)
kvm_restore_gc0_config4(cop0);
if (cpu_guest_has_conf5)
kvm_restore_gc0_config5(cop0);
if (cpu_guest_has_conf6)
kvm_restore_gc0_config6(cop0);
if (cpu_guest_has_conf7)
kvm_restore_gc0_config7(cop0);
kvm_restore_gc0_index(cop0);
kvm_restore_gc0_entrylo0(cop0);
kvm_restore_gc0_entrylo1(cop0);
kvm_restore_gc0_context(cop0);
if (cpu_guest_has_contextconfig)
kvm_restore_gc0_contextconfig(cop0);
#ifdef CONFIG_64BIT
kvm_restore_gc0_xcontext(cop0);
if (cpu_guest_has_contextconfig)
kvm_restore_gc0_xcontextconfig(cop0);
#endif
kvm_restore_gc0_pagemask(cop0);
kvm_restore_gc0_pagegrain(cop0);
kvm_restore_gc0_hwrena(cop0);
kvm_restore_gc0_badvaddr(cop0);
kvm_restore_gc0_entryhi(cop0);
kvm_restore_gc0_status(cop0);
kvm_restore_gc0_intctl(cop0);
kvm_restore_gc0_epc(cop0);
kvm_vz_write_gc0_ebase(kvm_read_sw_gc0_ebase(cop0));
if (cpu_guest_has_userlocal)
kvm_restore_gc0_userlocal(cop0);
kvm_restore_gc0_errorepc(cop0);
/* restore KScratch registers if enabled in guest */
if (cpu_guest_has_conf4) {
if (cpu_guest_has_kscr(2))
kvm_restore_gc0_kscratch1(cop0);
if (cpu_guest_has_kscr(3))
kvm_restore_gc0_kscratch2(cop0);
if (cpu_guest_has_kscr(4))
kvm_restore_gc0_kscratch3(cop0);
if (cpu_guest_has_kscr(5))
kvm_restore_gc0_kscratch4(cop0);
if (cpu_guest_has_kscr(6))
kvm_restore_gc0_kscratch5(cop0);
if (cpu_guest_has_kscr(7))
kvm_restore_gc0_kscratch6(cop0);
}
if (cpu_guest_has_badinstr)
kvm_restore_gc0_badinstr(cop0);
if (cpu_guest_has_badinstrp)
kvm_restore_gc0_badinstrp(cop0);
if (cpu_guest_has_segments) {
kvm_restore_gc0_segctl0(cop0);
kvm_restore_gc0_segctl1(cop0);
kvm_restore_gc0_segctl2(cop0);
}
/* restore HTW registers */
if (cpu_guest_has_htw || cpu_guest_has_ldpte) {
kvm_restore_gc0_pwbase(cop0);
kvm_restore_gc0_pwfield(cop0);
kvm_restore_gc0_pwsize(cop0);
kvm_restore_gc0_pwctl(cop0);
}
/* restore Root.GuestCtl2 from unused Guest guestctl2 register */
if (cpu_has_guestctl2)
write_c0_guestctl2(
cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL]);
/*
* We should clear linked load bit to break interrupted atomics. This
* prevents a SC on the next VCPU from succeeding by matching a LL on
* the previous VCPU.
*/
if (vcpu->kvm->created_vcpus > 1)
write_gc0_lladdr(0);
return 0;
}
static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
if (current->flags & PF_VCPU)
kvm_vz_vcpu_save_wired(vcpu);
kvm_lose_fpu(vcpu);
kvm_save_gc0_index(cop0);
kvm_save_gc0_entrylo0(cop0);
kvm_save_gc0_entrylo1(cop0);
kvm_save_gc0_context(cop0);
if (cpu_guest_has_contextconfig)
kvm_save_gc0_contextconfig(cop0);
#ifdef CONFIG_64BIT
kvm_save_gc0_xcontext(cop0);
if (cpu_guest_has_contextconfig)
kvm_save_gc0_xcontextconfig(cop0);
#endif
kvm_save_gc0_pagemask(cop0);
kvm_save_gc0_pagegrain(cop0);
kvm_save_gc0_wired(cop0);
/* allow wired TLB entries to be overwritten */
clear_gc0_wired(MIPSR6_WIRED_WIRED);
kvm_save_gc0_hwrena(cop0);
kvm_save_gc0_badvaddr(cop0);
kvm_save_gc0_entryhi(cop0);
kvm_save_gc0_status(cop0);
kvm_save_gc0_intctl(cop0);
kvm_save_gc0_epc(cop0);
kvm_write_sw_gc0_ebase(cop0, kvm_vz_read_gc0_ebase());
if (cpu_guest_has_userlocal)
kvm_save_gc0_userlocal(cop0);
/* only save implemented config registers */
kvm_save_gc0_config(cop0);
if (cpu_guest_has_conf1)
kvm_save_gc0_config1(cop0);
if (cpu_guest_has_conf2)
kvm_save_gc0_config2(cop0);
if (cpu_guest_has_conf3)
kvm_save_gc0_config3(cop0);
if (cpu_guest_has_conf4)
kvm_save_gc0_config4(cop0);
if (cpu_guest_has_conf5)
kvm_save_gc0_config5(cop0);
if (cpu_guest_has_conf6)
kvm_save_gc0_config6(cop0);
if (cpu_guest_has_conf7)
kvm_save_gc0_config7(cop0);
kvm_save_gc0_errorepc(cop0);
/* save KScratch registers if enabled in guest */
if (cpu_guest_has_conf4) {
if (cpu_guest_has_kscr(2))
kvm_save_gc0_kscratch1(cop0);
if (cpu_guest_has_kscr(3))
kvm_save_gc0_kscratch2(cop0);
if (cpu_guest_has_kscr(4))
kvm_save_gc0_kscratch3(cop0);
if (cpu_guest_has_kscr(5))
kvm_save_gc0_kscratch4(cop0);
if (cpu_guest_has_kscr(6))
kvm_save_gc0_kscratch5(cop0);
if (cpu_guest_has_kscr(7))
kvm_save_gc0_kscratch6(cop0);
}
if (cpu_guest_has_badinstr)
kvm_save_gc0_badinstr(cop0);
if (cpu_guest_has_badinstrp)
kvm_save_gc0_badinstrp(cop0);
if (cpu_guest_has_segments) {
kvm_save_gc0_segctl0(cop0);
kvm_save_gc0_segctl1(cop0);
kvm_save_gc0_segctl2(cop0);
}
/* save HTW registers if enabled in guest */
if (cpu_guest_has_ldpte || (cpu_guest_has_htw &&
kvm_read_sw_gc0_config3(cop0) & MIPS_CONF3_PW)) {
kvm_save_gc0_pwbase(cop0);
kvm_save_gc0_pwfield(cop0);
kvm_save_gc0_pwsize(cop0);
kvm_save_gc0_pwctl(cop0);
}
kvm_vz_save_timer(vcpu);
/* save Root.GuestCtl2 in unused Guest guestctl2 register */
if (cpu_has_guestctl2)
cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] =
read_c0_guestctl2();
return 0;
}
/**
* kvm_vz_resize_guest_vtlb() - Attempt to resize guest VTLB.
* @size: Number of guest VTLB entries (0 < @size <= root VTLB entries).
*
* Attempt to resize the guest VTLB by writing guest Config registers. This is
* necessary for cores with a shared root/guest TLB to avoid overlap with wired
* entries in the root VTLB.
*
* Returns: The resulting guest VTLB size.
*/
static unsigned int kvm_vz_resize_guest_vtlb(unsigned int size)
{
unsigned int config4 = 0, ret = 0, limit;
/* Write MMUSize - 1 into guest Config registers */
if (cpu_guest_has_conf1)
change_gc0_config1(MIPS_CONF1_TLBS,
(size - 1) << MIPS_CONF1_TLBS_SHIFT);
if (cpu_guest_has_conf4) {
config4 = read_gc0_config4();
if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT) {
config4 &= ~MIPS_CONF4_VTLBSIZEEXT;
config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
MIPS_CONF4_VTLBSIZEEXT_SHIFT;
} else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT) {
config4 &= ~MIPS_CONF4_MMUSIZEEXT;
config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
MIPS_CONF4_MMUSIZEEXT_SHIFT;
}
write_gc0_config4(config4);
}
/*
* Set Guest.Wired.Limit = 0 (no limit up to Guest.MMUSize-1), unless it
* would exceed Root.Wired.Limit (clearing Guest.Wired.Wired so write
* not dropped)
*/
if (cpu_has_mips_r6) {
limit = (read_c0_wired() & MIPSR6_WIRED_LIMIT) >>
MIPSR6_WIRED_LIMIT_SHIFT;
if (size - 1 <= limit)
limit = 0;
write_gc0_wired(limit << MIPSR6_WIRED_LIMIT_SHIFT);
}
/* Read back MMUSize - 1 */
back_to_back_c0_hazard();
if (cpu_guest_has_conf1)
ret = (read_gc0_config1() & MIPS_CONF1_TLBS) >>
MIPS_CONF1_TLBS_SHIFT;
if (config4) {
if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT)
ret |= ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
MIPS_CONF4_VTLBSIZEEXT_SHIFT) <<
MIPS_CONF1_TLBS_SIZE;
else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT)
ret |= ((config4 & MIPS_CONF4_MMUSIZEEXT) >>
MIPS_CONF4_MMUSIZEEXT_SHIFT) <<
MIPS_CONF1_TLBS_SIZE;
}
return ret + 1;
}
static int kvm_vz_hardware_enable(void)
{
unsigned int mmu_size, guest_mmu_size, ftlb_size;
u64 guest_cvmctl, cvmvmconfig;
switch (current_cpu_type()) {
case CPU_CAVIUM_OCTEON3:
/* Set up guest timer/perfcount IRQ lines */
guest_cvmctl = read_gc0_cvmctl();
guest_cvmctl &= ~CVMCTL_IPTI;
guest_cvmctl |= 7ull << CVMCTL_IPTI_SHIFT;
guest_cvmctl &= ~CVMCTL_IPPCI;
guest_cvmctl |= 6ull << CVMCTL_IPPCI_SHIFT;
write_gc0_cvmctl(guest_cvmctl);
cvmvmconfig = read_c0_cvmvmconfig();
/* No I/O hole translation. */
cvmvmconfig |= CVMVMCONF_DGHT;
/* Halve the root MMU size */
mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
>> CVMVMCONF_MMUSIZEM1_S) + 1;
guest_mmu_size = mmu_size / 2;
mmu_size -= guest_mmu_size;
cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
cvmvmconfig |= mmu_size - 1;
write_c0_cvmvmconfig(cvmvmconfig);
/* Update our records */
current_cpu_data.tlbsize = mmu_size;
current_cpu_data.tlbsizevtlb = mmu_size;
current_cpu_data.guest.tlbsize = guest_mmu_size;
/* Flush moved entries in new (guest) context */
kvm_vz_local_flush_guesttlb_all();
break;
default:
/*
* ImgTec cores tend to use a shared root/guest TLB. To avoid
* overlap of root wired and guest entries, the guest TLB may
* need resizing.
*/
mmu_size = current_cpu_data.tlbsizevtlb;
ftlb_size = current_cpu_data.tlbsize - mmu_size;
/* Try switching to maximum guest VTLB size for flush */
guest_mmu_size = kvm_vz_resize_guest_vtlb(mmu_size);
current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
kvm_vz_local_flush_guesttlb_all();
/*
* Reduce to make space for root wired entries and at least 2
* root non-wired entries. This does assume that long-term wired
* entries won't be added later.
*/
guest_mmu_size = mmu_size - num_wired_entries() - 2;
guest_mmu_size = kvm_vz_resize_guest_vtlb(guest_mmu_size);
current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
/*
* Write the VTLB size, but if another CPU has already written,
* check it matches or we won't provide a consistent view to the
* guest. If this ever happens it suggests an asymmetric number
* of wired entries.
*/
if (cmpxchg(&kvm_vz_guest_vtlb_size, 0, guest_mmu_size) &&
WARN(guest_mmu_size != kvm_vz_guest_vtlb_size,
"Available guest VTLB size mismatch"))
return -EINVAL;
break;
}
/*
* Enable virtualization features granting guest direct control of
* certain features:
* CP0=1: Guest coprocessor 0 context.
* AT=Guest: Guest MMU.
* CG=1: Hit (virtual address) CACHE operations (optional).
* CF=1: Guest Config registers.
* CGI=1: Indexed flush CACHE operations (optional).
*/
write_c0_guestctl0(MIPS_GCTL0_CP0 |
(MIPS_GCTL0_AT_GUEST << MIPS_GCTL0_AT_SHIFT) |
MIPS_GCTL0_CG | MIPS_GCTL0_CF);
if (cpu_has_guestctl0ext) {
if (current_cpu_type() != CPU_LOONGSON64)
set_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
else
clear_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
}
if (cpu_has_guestid) {
write_c0_guestctl1(0);
kvm_vz_local_flush_roottlb_all_guests();
GUESTID_MASK = current_cpu_data.guestid_mask;
GUESTID_FIRST_VERSION = GUESTID_MASK + 1;
GUESTID_VERSION_MASK = ~GUESTID_MASK;
current_cpu_data.guestid_cache = GUESTID_FIRST_VERSION;
}
/* clear any pending injected virtual guest interrupts */
if (cpu_has_guestctl2)
clear_c0_guestctl2(0x3f << 10);
#ifdef CONFIG_CPU_LOONGSON64
/* Control guest CCA attribute */
if (cpu_has_csr())
csr_writel(csr_readl(0xffffffec) | 0x1, 0xffffffec);
#endif
return 0;
}
static void kvm_vz_hardware_disable(void)
{
u64 cvmvmconfig;
unsigned int mmu_size;
/* Flush any remaining guest TLB entries */
kvm_vz_local_flush_guesttlb_all();
switch (current_cpu_type()) {
case CPU_CAVIUM_OCTEON3:
/*
* Allocate whole TLB for root. Existing guest TLB entries will
* change ownership to the root TLB. We should be safe though as
* they've already been flushed above while in guest TLB.
*/
cvmvmconfig = read_c0_cvmvmconfig();
mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
>> CVMVMCONF_MMUSIZEM1_S) + 1;
cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
cvmvmconfig |= mmu_size - 1;
write_c0_cvmvmconfig(cvmvmconfig);
/* Update our records */
current_cpu_data.tlbsize = mmu_size;
current_cpu_data.tlbsizevtlb = mmu_size;
current_cpu_data.guest.tlbsize = 0;
/* Flush moved entries in new (root) context */
local_flush_tlb_all();
break;
}
if (cpu_has_guestid) {
write_c0_guestctl1(0);
kvm_vz_local_flush_roottlb_all_guests();
}
}
static int kvm_vz_check_extension(struct kvm *kvm, long ext)
{
int r;
switch (ext) {
case KVM_CAP_MIPS_VZ:
/* we wouldn't be here unless cpu_has_vz */
r = 1;
break;
#ifdef CONFIG_64BIT
case KVM_CAP_MIPS_64BIT:
/* We support 64-bit registers/operations and addresses */
r = 2;
break;
#endif
case KVM_CAP_IOEVENTFD:
r = 1;
break;
default:
r = 0;
break;
}
return r;
}
static int kvm_vz_vcpu_init(struct kvm_vcpu *vcpu)
{
int i;
for_each_possible_cpu(i)
vcpu->arch.vzguestid[i] = 0;
return 0;
}
static void kvm_vz_vcpu_uninit(struct kvm_vcpu *vcpu)
{
int cpu;
/*
* If the VCPU is freed and reused as another VCPU, we don't want the
* matching pointer wrongly hanging around in last_vcpu[] or
* last_exec_vcpu[].
*/
for_each_possible_cpu(cpu) {
if (last_vcpu[cpu] == vcpu)
last_vcpu[cpu] = NULL;
if (last_exec_vcpu[cpu] == vcpu)
last_exec_vcpu[cpu] = NULL;
}
}
static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
unsigned long count_hz = 100*1000*1000; /* default to 100 MHz */
/*
* Start off the timer at the same frequency as the host timer, but the
* soft timer doesn't handle frequencies greater than 1GHz yet.
*/
if (mips_hpt_frequency && mips_hpt_frequency <= NSEC_PER_SEC)
count_hz = mips_hpt_frequency;
kvm_mips_init_count(vcpu, count_hz);
/*
* Initialize guest register state to valid architectural reset state.
*/
/* PageGrain */
if (cpu_has_mips_r5 || cpu_has_mips_r6)
kvm_write_sw_gc0_pagegrain(cop0, PG_RIE | PG_XIE | PG_IEC);
/* Wired */
if (cpu_has_mips_r6)
kvm_write_sw_gc0_wired(cop0,
read_gc0_wired() & MIPSR6_WIRED_LIMIT);
/* Status */
kvm_write_sw_gc0_status(cop0, ST0_BEV | ST0_ERL);
if (cpu_has_mips_r5 || cpu_has_mips_r6)
kvm_change_sw_gc0_status(cop0, ST0_FR, read_gc0_status());
/* IntCtl */
kvm_write_sw_gc0_intctl(cop0, read_gc0_intctl() &
(INTCTLF_IPFDC | INTCTLF_IPPCI | INTCTLF_IPTI));
/* PRId */
kvm_write_sw_gc0_prid(cop0, boot_cpu_data.processor_id);
/* EBase */
kvm_write_sw_gc0_ebase(cop0, (s32)0x80000000 | vcpu->vcpu_id);
/* Config */
kvm_save_gc0_config(cop0);
/* architecturally writable (e.g. from guest) */
kvm_change_sw_gc0_config(cop0, CONF_CM_CMASK,
_page_cachable_default >> _CACHE_SHIFT);
/* architecturally read only, but maybe writable from root */
kvm_change_sw_gc0_config(cop0, MIPS_CONF_MT, read_c0_config());
if (cpu_guest_has_conf1) {
kvm_set_sw_gc0_config(cop0, MIPS_CONF_M);
/* Config1 */
kvm_save_gc0_config1(cop0);
/* architecturally read only, but maybe writable from root */
kvm_clear_sw_gc0_config1(cop0, MIPS_CONF1_C2 |
MIPS_CONF1_MD |
MIPS_CONF1_PC |
MIPS_CONF1_WR |
MIPS_CONF1_CA |
MIPS_CONF1_FP);
}
if (cpu_guest_has_conf2) {
kvm_set_sw_gc0_config1(cop0, MIPS_CONF_M);
/* Config2 */
kvm_save_gc0_config2(cop0);
}
if (cpu_guest_has_conf3) {
kvm_set_sw_gc0_config2(cop0, MIPS_CONF_M);
/* Config3 */
kvm_save_gc0_config3(cop0);
/* architecturally writable (e.g. from guest) */
kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_ISA_OE);
/* architecturally read only, but maybe writable from root */
kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_MSA |
MIPS_CONF3_BPG |
MIPS_CONF3_ULRI |
MIPS_CONF3_DSP |
MIPS_CONF3_CTXTC |
MIPS_CONF3_ITL |
MIPS_CONF3_LPA |
MIPS_CONF3_VEIC |
MIPS_CONF3_VINT |
MIPS_CONF3_SP |
MIPS_CONF3_CDMM |
MIPS_CONF3_MT |
MIPS_CONF3_SM |
MIPS_CONF3_TL);
}
if (cpu_guest_has_conf4) {
kvm_set_sw_gc0_config3(cop0, MIPS_CONF_M);
/* Config4 */
kvm_save_gc0_config4(cop0);
}
if (cpu_guest_has_conf5) {
kvm_set_sw_gc0_config4(cop0, MIPS_CONF_M);
/* Config5 */
kvm_save_gc0_config5(cop0);
/* architecturally writable (e.g. from guest) */
kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_K |
MIPS_CONF5_CV |
MIPS_CONF5_MSAEN |
MIPS_CONF5_UFE |
MIPS_CONF5_FRE |
MIPS_CONF5_SBRI |
MIPS_CONF5_UFR);
/* architecturally read only, but maybe writable from root */
kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_MRP);
}
if (cpu_guest_has_contextconfig) {
/* ContextConfig */
kvm_write_sw_gc0_contextconfig(cop0, 0x007ffff0);
#ifdef CONFIG_64BIT
/* XContextConfig */
/* bits SEGBITS-13+3:4 set */
kvm_write_sw_gc0_xcontextconfig(cop0,
((1ull << (cpu_vmbits - 13)) - 1) << 4);
#endif
}
/* Implementation dependent, use the legacy layout */
if (cpu_guest_has_segments) {
/* SegCtl0, SegCtl1, SegCtl2 */
kvm_write_sw_gc0_segctl0(cop0, 0x00200010);
kvm_write_sw_gc0_segctl1(cop0, 0x00000002 |
(_page_cachable_default >> _CACHE_SHIFT) <<
(16 + MIPS_SEGCFG_C_SHIFT));
kvm_write_sw_gc0_segctl2(cop0, 0x00380438);
}
/* reset HTW registers */
if (cpu_guest_has_htw && (cpu_has_mips_r5 || cpu_has_mips_r6)) {
/* PWField */
kvm_write_sw_gc0_pwfield(cop0, 0x0c30c302);
/* PWSize */
kvm_write_sw_gc0_pwsize(cop0, 1 << MIPS_PWSIZE_PTW_SHIFT);
}
/* start with no pending virtual guest interrupts */
if (cpu_has_guestctl2)
cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = 0;
/* Put PC at reset vector */
vcpu->arch.pc = CKSEG1ADDR(0x1fc00000);
return 0;
}
static void kvm_vz_prepare_flush_shadow(struct kvm *kvm)
{
if (!cpu_has_guestid) {
/*
* For each CPU there is a single GPA ASID used by all VCPUs in
* the VM, so it doesn't make sense for the VCPUs to handle
* invalidation of these ASIDs individually.
*
* Instead mark all CPUs as needing ASID invalidation in
* asid_flush_mask, and kvm_flush_remote_tlbs(kvm) will
* kick any running VCPUs so they check asid_flush_mask.
*/
cpumask_setall(&kvm->arch.asid_flush_mask);
}
}
static void kvm_vz_vcpu_reenter(struct kvm_vcpu *vcpu)
{
int cpu = smp_processor_id();
int preserve_guest_tlb;
preserve_guest_tlb = kvm_vz_check_requests(vcpu, cpu);
if (preserve_guest_tlb)
kvm_vz_vcpu_save_wired(vcpu);
kvm_vz_vcpu_load_tlb(vcpu, cpu);
if (preserve_guest_tlb)
kvm_vz_vcpu_load_wired(vcpu);
}
static int kvm_vz_vcpu_run(struct kvm_vcpu *vcpu)
{
int cpu = smp_processor_id();
int r;
kvm_vz_acquire_htimer(vcpu);
/* Check if we have any exceptions/interrupts pending */
kvm_mips_deliver_interrupts(vcpu, read_gc0_cause());
kvm_vz_check_requests(vcpu, cpu);
kvm_vz_vcpu_load_tlb(vcpu, cpu);
kvm_vz_vcpu_load_wired(vcpu);
r = vcpu->arch.vcpu_run(vcpu);
kvm_vz_vcpu_save_wired(vcpu);
return r;
}
static struct kvm_mips_callbacks kvm_vz_callbacks = {
.handle_cop_unusable = kvm_trap_vz_handle_cop_unusable,
.handle_tlb_mod = kvm_trap_vz_handle_tlb_st_miss,
.handle_tlb_ld_miss = kvm_trap_vz_handle_tlb_ld_miss,
.handle_tlb_st_miss = kvm_trap_vz_handle_tlb_st_miss,
.handle_addr_err_st = kvm_trap_vz_no_handler,
.handle_addr_err_ld = kvm_trap_vz_no_handler,
.handle_syscall = kvm_trap_vz_no_handler,
.handle_res_inst = kvm_trap_vz_no_handler,
.handle_break = kvm_trap_vz_no_handler,
.handle_msa_disabled = kvm_trap_vz_handle_msa_disabled,
.handle_guest_exit = kvm_trap_vz_handle_guest_exit,
.hardware_enable = kvm_vz_hardware_enable,
.hardware_disable = kvm_vz_hardware_disable,
.check_extension = kvm_vz_check_extension,
.vcpu_init = kvm_vz_vcpu_init,
.vcpu_uninit = kvm_vz_vcpu_uninit,
.vcpu_setup = kvm_vz_vcpu_setup,
.prepare_flush_shadow = kvm_vz_prepare_flush_shadow,
.gva_to_gpa = kvm_vz_gva_to_gpa_cb,
.queue_timer_int = kvm_vz_queue_timer_int_cb,
.dequeue_timer_int = kvm_vz_dequeue_timer_int_cb,
.queue_io_int = kvm_vz_queue_io_int_cb,
.dequeue_io_int = kvm_vz_dequeue_io_int_cb,
.irq_deliver = kvm_vz_irq_deliver_cb,
.irq_clear = kvm_vz_irq_clear_cb,
.num_regs = kvm_vz_num_regs,
.copy_reg_indices = kvm_vz_copy_reg_indices,
.get_one_reg = kvm_vz_get_one_reg,
.set_one_reg = kvm_vz_set_one_reg,
.vcpu_load = kvm_vz_vcpu_load,
.vcpu_put = kvm_vz_vcpu_put,
.vcpu_run = kvm_vz_vcpu_run,
.vcpu_reenter = kvm_vz_vcpu_reenter,
};
/* FIXME: Get rid of the callbacks now that trap-and-emulate is gone. */
struct kvm_mips_callbacks *kvm_mips_callbacks = &kvm_vz_callbacks;
int kvm_mips_emulation_init(void)
{
if (!cpu_has_vz)
return -ENODEV;
/*
* VZ requires at least 2 KScratch registers, so it should have been
* possible to allocate pgd_reg.
*/
if (WARN(pgd_reg == -1,
"pgd_reg not allocated even though cpu_has_vz\n"))
return -ENODEV;
pr_info("Starting KVM with MIPS VZ extensions\n");
return 0;
}
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