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Second set of KVM/ARM changes for 4.3-rc2

Browse Source 
- Workaround for a Cortex-A57 erratum
 - Bug fix for the debugging infrastructure
 - Fix for 32bit guests with more than 4GB of address space
   on a 32bit host
 - A number of fixes for the (unusual) case when we don't use
   the in-kernel GIC emulation
 - Removal of ThumbEE handling on arm64, since these have been
   dropped from the architecture before anyone actually ever
   built a CPU
 - Remove the KVM_ARM_MAX_VCPUS limitation which has become
   fairly pointless
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Merge tag 'kvm-arm-for-4.3-rc2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-master

Second set of KVM/ARM changes for 4.3-rc2

- Workaround for a Cortex-A57 erratum
- Bug fix for the debugging infrastructure
- Fix for 32bit guests with more than 4GB of address space
  on a 32bit host
- A number of fixes for the (unusual) case when we don't use
  the in-kernel GIC emulation
- Removal of ThumbEE handling on arm64, since these have been
  dropped from the architecture before anyone actually ever
  built a CPU
- Remove the KVM_ARM_MAX_VCPUS limitation which has become
  fairly pointless
This commit is contained in:
Paolo Bonzini 2015-09-17 16:51:59 +02:00
commit efe4d36a75
13 changed files with 30 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm/include/asm/kvm_host.h
View File

@ -29,12 +29,6 @@
#define __KVM_HAVE_ARCH_INTC_INITIALIZED
#if defined(CONFIG_KVM_ARM_MAX_VCPUS)
#define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
#else
#define KVM_MAX_VCPUS 0
#endif
#define KVM_USER_MEM_SLOTS 32
#define KVM_PRIVATE_MEM_SLOTS 4
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
@ -44,6 +38,8 @@
#include <kvm/arm_vgic.h>
#define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
int __attribute_const__ kvm_target_cpu(void);
int kvm_reset_vcpu(struct kvm_vcpu *vcpu);

11
arch/arm/kvm/Kconfig
View File

@ -45,15 +45,4 @@ config KVM_ARM_HOST
---help---
Provides host support for ARM processors.
config KVM_ARM_MAX_VCPUS
int "Number maximum supported virtual CPUs per VM"
depends on KVM_ARM_HOST
default 4
help
Static number of max supported virtual CPUs per VM.
If you choose a high number, the vcpu structures will be quite
large, so only choose a reasonable number that you expect to
actually use.
endif # VIRTUALIZATION

2
arch/arm/kvm/arm.c
View File

@ -446,7 +446,7 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
* Map the VGIC hardware resources before running a vcpu the first
* time on this VM.
*/
if (unlikely(!vgic_ready(kvm))) {
if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
ret = kvm_vgic_map_resources(kvm);
if (ret)
return ret;

6
arch/arm/kvm/interrupts_head.S
View File

@ -515,8 +515,7 @@ ARM_BE8(rev r6, r6 )
mrc p15, 0, r2, c14, c3, 1 @ CNTV_CTL
str r2, [vcpu, #VCPU_TIMER_CNTV_CTL]
bic r2, #1 @ Clear ENABLE
mcr p15, 0, r2, c14, c3, 1 @ CNTV_CTL
isb
mrrc p15, 3, rr_lo_hi(r2, r3), c14 @ CNTV_CVAL
@ -529,6 +528,9 @@ ARM_BE8(rev r6, r6 )
mcrr p15, 4, r2, r2, c14 @ CNTVOFF
1:
mov r2, #0 @ Clear ENABLE
mcr p15, 0, r2, c14, c3, 1 @ CNTV_CTL
@ Allow physical timer/counter access for the host
mrc p15, 4, r2, c14, c1, 0 @ CNTHCTL
orr r2, r2, #(CNTHCTL_PL1PCEN | CNTHCTL_PL1PCTEN)

6
arch/arm/kvm/mmu.c
View File

@ -1792,8 +1792,10 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
if (vma->vm_flags & VM_PFNMAP) {
gpa_t gpa = mem->guest_phys_addr +
(vm_start - mem->userspace_addr);
phys_addr_t pa = (vma->vm_pgoff << PAGE_SHIFT) +
vm_start - vma->vm_start;
phys_addr_t pa;
pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT;
pa += vm_start - vma->vm_start;
/* IO region dirty page logging not allowed */
if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES)

1
arch/arm64/include/asm/kvm_arm.h
View File

@ -172,7 +172,6 @@
#define VTTBR_VMID_MASK (UL(0xFF) << VTTBR_VMID_SHIFT)
/* Hyp System Trap Register */
#define HSTR_EL2_TTEE (1 << 16)
#define HSTR_EL2_T(x) (1 << x)
/* Hyp Coproccessor Trap Register Shifts */

4
arch/arm64/include/asm/kvm_asm.h
View File

@ -53,9 +53,7 @@
#define IFSR32_EL2 25 /* Instruction Fault Status Register */
#define FPEXC32_EL2 26 /* Floating-Point Exception Control Register */
#define DBGVCR32_EL2 27 /* Debug Vector Catch Register */
#define TEECR32_EL1 28 /* ThumbEE Configuration Register */
#define TEEHBR32_EL1 29 /* ThumbEE Handler Base Register */
#define NR_SYS_REGS 30
#define NR_SYS_REGS 28
/* 32bit mapping */
#define c0_MPIDR (MPIDR_EL1 * 2) /* MultiProcessor ID Register */

8
arch/arm64/include/asm/kvm_host.h
View File

@ -30,12 +30,6 @@
#define __KVM_HAVE_ARCH_INTC_INITIALIZED
#if defined(CONFIG_KVM_ARM_MAX_VCPUS)
#define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
#else
#define KVM_MAX_VCPUS 0
#endif
#define KVM_USER_MEM_SLOTS 32
#define KVM_PRIVATE_MEM_SLOTS 4
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
@ -43,6 +37,8 @@
#include <kvm/arm_vgic.h>
#include <kvm/arm_arch_timer.h>
#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
#define KVM_VCPU_MAX_FEATURES 3
int __attribute_const__ kvm_target_cpu(void);

11
arch/arm64/kvm/Kconfig
View File

@ -41,15 +41,4 @@ config KVM_ARM_HOST
---help---
Provides host support for ARM processors.
config KVM_ARM_MAX_VCPUS
int "Number maximum supported virtual CPUs per VM"
depends on KVM_ARM_HOST
default 4
help
Static number of max supported virtual CPUs per VM.
If you choose a high number, the vcpu structures will be quite
large, so only choose a reasonable number that you expect to
actually use.
endif # VIRTUALIZATION

31
arch/arm64/kvm/hyp.S
View File

@ -433,20 +433,13 @@
mrs x5, ifsr32_el2
stp x4, x5, [x3]
skip_fpsimd_state x8, 3f
skip_fpsimd_state x8, 2f
mrs x6, fpexc32_el2
str x6, [x3, #16]
3:
skip_debug_state x8, 2f
2:
skip_debug_state x8, 1f
mrs x7, dbgvcr32_el2
str x7, [x3, #24]
2:
skip_tee_state x8, 1f
add x3, x2, #CPU_SYSREG_OFFSET(TEECR32_EL1)
mrs x4, teecr32_el1
mrs x5, teehbr32_el1
stp x4, x5, [x3]
1:
.endm
@ -466,16 +459,9 @@
msr dacr32_el2, x4
msr ifsr32_el2, x5
skip_debug_state x8, 2f
skip_debug_state x8, 1f
ldr x7, [x3, #24]
msr dbgvcr32_el2, x7
2:
skip_tee_state x8, 1f
add x3, x2, #CPU_SYSREG_OFFSET(TEECR32_EL1)
ldp x4, x5, [x3]
msr teecr32_el1, x4
msr teehbr32_el1, x5
1:
.endm
@ -570,8 +556,6 @@ alternative_endif
mrs x3, cntv_ctl_el0
and x3, x3, #3
str w3, [x0, #VCPU_TIMER_CNTV_CTL]
bic x3, x3, #1 // Clear Enable
msr cntv_ctl_el0, x3
isb
@ -579,6 +563,9 @@ alternative_endif
str x3, [x0, #VCPU_TIMER_CNTV_CVAL]
1:
// Disable the virtual timer
msr cntv_ctl_el0, xzr
// Allow physical timer/counter access for the host
mrs x2, cnthctl_el2
orr x2, x2, #3
@ -753,6 +740,9 @@ ENTRY(__kvm_vcpu_run)
// Guest context
add x2, x0, #VCPU_CONTEXT
// We must restore the 32-bit state before the sysregs, thanks
// to Cortex-A57 erratum #852523.
restore_guest_32bit_state
bl __restore_sysregs
skip_debug_state x3, 1f
@ -760,7 +750,6 @@ ENTRY(__kvm_vcpu_run)
kern_hyp_va x3
bl __restore_debug
1:
restore_guest_32bit_state
restore_guest_regs
// That's it, no more messing around.

15
arch/arm64/kvm/sys_regs.c
View File

@ -272,7 +272,7 @@ static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
{
__u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg];
if (copy_from_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
return -EFAULT;
return 0;
}
@ -314,7 +314,7 @@ static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
{
__u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg];
if (copy_from_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
return -EFAULT;
return 0;
@ -358,7 +358,7 @@ static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
{
__u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg];
if (copy_from_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
return -EFAULT;
return 0;
}
@ -400,7 +400,7 @@ static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
{
__u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg];
if (copy_from_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0)
if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0)
return -EFAULT;
return 0;
}
@ -539,13 +539,6 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b110),
trap_dbgauthstatus_el1 },
/* TEECR32_EL1 */
{ Op0(0b10), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000),
NULL, reset_val, TEECR32_EL1, 0 },
/* TEEHBR32_EL1 */
{ Op0(0b10), Op1(0b010), CRn(0b0001), CRm(0b0000), Op2(0b000),
NULL, reset_val, TEEHBR32_EL1, 0 },
/* MDCCSR_EL1 */
{ Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0001), Op2(0b000),
trap_raz_wi },

6
include/kvm/arm_vgic.h
View File

@ -35,11 +35,7 @@
#define VGIC_V3_MAX_LRS 16
#define VGIC_MAX_IRQS 1024
#define VGIC_V2_MAX_CPUS 8
/* Sanity checks... */
#if (KVM_MAX_VCPUS > 255)
#error Too many KVM VCPUs, the VGIC only supports up to 255 VCPUs for now
#endif
#define VGIC_V3_MAX_CPUS 255
#if (VGIC_NR_IRQS_LEGACY & 31)
#error "VGIC_NR_IRQS must be a multiple of 32"

2
virt/kvm/arm/vgic-v3.c
View File

@ -288,7 +288,7 @@ int vgic_v3_probe(struct device_node *vgic_node,
vgic->vctrl_base = NULL;
vgic->type = VGIC_V3;
vgic->max_gic_vcpus = KVM_MAX_VCPUS;
vgic->max_gic_vcpus = VGIC_V3_MAX_CPUS;
kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
vcpu_res.start, vgic->maint_irq);