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ARM: KVM: Initial VGIC infrastructure code

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Wire the basic framework code for VGIC support and the initial in-kernel
MMIO support code for the VGIC, used for the distributor emulation.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2013-01-21 19:36:12 -05:00
parent 1638a12d4e
commit 1a89dd9113
7 changed files with 275 additions and 1 deletions
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8
arch/arm/include/asm/kvm_host.h
View File

@ -37,6 +37,8 @@
#define KVM_NR_PAGE_SIZES 1
#define KVM_PAGES_PER_HPAGE(x) (1UL<<31)
#include <asm/kvm_vgic.h>
struct kvm_vcpu;
u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
int kvm_target_cpu(void);
@ -58,6 +60,9 @@ struct kvm_arch {
/* Stage-2 page table */
pgd_t *pgd;
/* Interrupt controller */
struct vgic_dist vgic;
};
#define KVM_NR_MEM_OBJS 40
@ -92,6 +97,9 @@ struct kvm_vcpu_arch {
struct vfp_hard_struct vfp_guest;
struct vfp_hard_struct *vfp_host;
/* VGIC state */
struct vgic_cpu vgic_cpu;
/*
* Anything that is not used directly from assembly code goes
* here.

80
arch/arm/include/asm/kvm_vgic.h Normal file
View File

@ -0,0 +1,80 @@
/*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __ASM_ARM_KVM_VGIC_H
#define __ASM_ARM_KVM_VGIC_H
#include <linux/irqchip/arm-gic.h>
struct vgic_dist {
};
struct vgic_cpu {
};
struct kvm;
struct kvm_vcpu;
struct kvm_run;
struct kvm_exit_mmio;
#ifdef CONFIG_KVM_ARM_VGIC
bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_exit_mmio *mmio);
#else
static inline int kvm_vgic_hyp_init(void)
{
return 0;
}
static inline int kvm_vgic_init(struct kvm *kvm)
{
return 0;
}
static inline int kvm_vgic_create(struct kvm *kvm)
{
return 0;
}
static inline int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) {}
static inline void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) {}
static inline int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_exit_mmio *mmio)
{
return false;
}
static inline int irqchip_in_kernel(struct kvm *kvm)
{
return 0;
}
#endif
#endif

1
arch/arm/kvm/Makefile
View File

@ -19,3 +19,4 @@ kvm-arm-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
obj-y += kvm-arm.o init.o interrupts.o
obj-y += arm.o guest.o mmu.o emulate.o reset.o
obj-y += coproc.o coproc_a15.o mmio.o psci.o
obj-$(CONFIG_KVM_ARM_VGIC) += vgic.o

27
arch/arm/kvm/arm.c
View File

@ -62,6 +62,8 @@ static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
static u8 kvm_next_vmid;
static DEFINE_SPINLOCK(kvm_vmid_lock);
static bool vgic_present;
static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
{
BUG_ON(preemptible());
@ -184,6 +186,9 @@ int kvm_dev_ioctl_check_extension(long ext)
{
int r;
switch (ext) {
case KVM_CAP_IRQCHIP:
r = vgic_present;
break;
case KVM_CAP_USER_MEMORY:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
@ -315,8 +320,16 @@ int __attribute_const__ kvm_target_cpu(void)
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
int ret;
/* Force users to call KVM_ARM_VCPU_INIT */
vcpu->arch.target = -1;
/* Set up VGIC */
ret = kvm_vgic_vcpu_init(vcpu);
if (ret)
return ret;
return 0;
}
@ -374,7 +387,7 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
*/
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
return !!v->arch.irq_lines;
return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
}
/* Just ensure a guest exit from a particular CPU */
@ -693,6 +706,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
if (vcpu->arch.pause)
vcpu_pause(vcpu);
kvm_vgic_flush_hwstate(vcpu);
local_irq_disable();
/*
@ -705,6 +720,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
local_irq_enable();
kvm_vgic_sync_hwstate(vcpu);
continue;
}
@ -737,6 +753,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
* Back from guest
*************************************************************/
kvm_vgic_sync_hwstate(vcpu);
ret = handle_exit(vcpu, run, ret);
}
@ -1011,6 +1029,13 @@ static int init_hyp_mode(void)
}
}
/*
* Init HYP view of VGIC
*/
err = kvm_vgic_hyp_init();
if (err)
goto out_free_vfp;
kvm_info("Hyp mode initialized successfully\n");
return 0;
out_free_vfp:

4
arch/arm/kvm/interrupts.S
View File

@ -94,6 +94,8 @@ ENTRY(__kvm_vcpu_run)
save_host_regs
restore_vgic_state
@ Store hardware CP15 state and load guest state
read_cp15_state store_to_vcpu = 0
write_cp15_state read_from_vcpu = 1
@ -187,6 +189,8 @@ after_vfp_restore:
read_cp15_state store_to_vcpu = 1
write_cp15_state read_from_vcpu = 0
save_vgic_state
restore_host_regs
clrex @ Clear exclusive monitor
mov r0, r1 @ Return the return code

3
arch/arm/kvm/mmio.c
View File

@ -148,6 +148,9 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
if (mmio.is_write)
memcpy(mmio.data, vcpu_reg(vcpu, rt), mmio.len);
if (vgic_handle_mmio(vcpu, run, &mmio))
return 1;
kvm_prepare_mmio(run, &mmio);
return 0;
}

153
arch/arm/kvm/vgic.c Normal file
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@ -0,0 +1,153 @@
/*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <asm/kvm_emulate.h>
#define ACCESS_READ_VALUE (1 << 0)
#define ACCESS_READ_RAZ (0 << 0)
#define ACCESS_READ_MASK(x) ((x) & (1 << 0))
#define ACCESS_WRITE_IGNORED (0 << 1)
#define ACCESS_WRITE_SETBIT (1 << 1)
#define ACCESS_WRITE_CLEARBIT (2 << 1)
#define ACCESS_WRITE_VALUE (3 << 1)
#define ACCESS_WRITE_MASK(x) ((x) & (3 << 1))
static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
{
return *((u32 *)mmio->data) & mask;
}
static void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
{
*((u32 *)mmio->data) = value & mask;
}
/**
* vgic_reg_access - access vgic register
* @mmio: pointer to the data describing the mmio access
* @reg: pointer to the virtual backing of vgic distributor data
* @offset: least significant 2 bits used for word offset
* @mode: ACCESS_ mode (see defines above)
*
* Helper to make vgic register access easier using one of the access
* modes defined for vgic register access
* (read,raz,write-ignored,setbit,clearbit,write)
*/
static void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
phys_addr_t offset, int mode)
{
int word_offset = (offset & 3) * 8;
u32 mask = (1UL << (mmio->len * 8)) - 1;
u32 regval;
/*
* Any alignment fault should have been delivered to the guest
* directly (ARM ARM B3.12.7 "Prioritization of aborts").
*/
if (reg) {
regval = *reg;
} else {
BUG_ON(mode != (ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED));
regval = 0;
}
if (mmio->is_write) {
u32 data = mmio_data_read(mmio, mask) << word_offset;
switch (ACCESS_WRITE_MASK(mode)) {
case ACCESS_WRITE_IGNORED:
return;
case ACCESS_WRITE_SETBIT:
regval |= data;
break;
case ACCESS_WRITE_CLEARBIT:
regval &= ~data;
break;
case ACCESS_WRITE_VALUE:
regval = (regval & ~(mask << word_offset)) | data;
break;
}
*reg = regval;
} else {
switch (ACCESS_READ_MASK(mode)) {
case ACCESS_READ_RAZ:
regval = 0;
/* fall through */
case ACCESS_READ_VALUE:
mmio_data_write(mmio, mask, regval >> word_offset);
}
}
}
/*
* I would have liked to use the kvm_bus_io_*() API instead, but it
* cannot cope with banked registers (only the VM pointer is passed
* around, and we need the vcpu). One of these days, someone please
* fix it!
*/
struct mmio_range {
phys_addr_t base;
unsigned long len;
bool (*handle_mmio)(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
phys_addr_t offset);
};
static const struct mmio_range vgic_ranges[] = {
{}
};
static const
struct mmio_range *find_matching_range(const struct mmio_range *ranges,
struct kvm_exit_mmio *mmio,
phys_addr_t base)
{
const struct mmio_range *r = ranges;
phys_addr_t addr = mmio->phys_addr - base;
while (r->len) {
if (addr >= r->base &&
(addr + mmio->len) <= (r->base + r->len))
return r;
r++;
}
return NULL;
}
/**
* vgic_handle_mmio - handle an in-kernel MMIO access
* @vcpu: pointer to the vcpu performing the access
* @run: pointer to the kvm_run structure
* @mmio: pointer to the data describing the access
*
* returns true if the MMIO access has been performed in kernel space,
* and false if it needs to be emulated in user space.
*/
bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_exit_mmio *mmio)
{
return KVM_EXIT_MMIO;
}