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KVM: arm64: Consolidate exception injection

Browse source 
Move the AArch32 exception injection code back into the inject_fault.c
file, removing the need for a few non-static functions now that AArch32
host support is a thing of the past.

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2020-10-15 09:45:24 +01:00
parent 7d76b8a603
commit dcfba39932
4 changed files with 73 additions and 102 deletions
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3
arch/arm64/include/asm/kvm_emulate.h
View file

@ -42,9 +42,6 @@ void kvm_inject_undefined(struct kvm_vcpu *vcpu);
void kvm_inject_vabt(struct kvm_vcpu *vcpu);
void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
void kvm_inject_undef32(struct kvm_vcpu *vcpu);
void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr);
void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr);
static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
{

2
arch/arm64/kvm/Makefile
View file

@ -16,7 +16,7 @@ kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \
inject_fault.o regmap.o va_layout.o handle_exit.o \
guest.o debug.o reset.o sys_regs.o \
vgic-sys-reg-v3.o fpsimd.o pmu.o \
aarch32.o arch_timer.o \
arch_timer.o \
vgic/vgic.o vgic/vgic-init.o \
vgic/vgic-irqfd.o vgic/vgic-v2.o \
vgic/vgic-v3.o vgic/vgic-v4.o \

95
arch/arm64/kvm/aarch32.c
View file

@ -1,95 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* (not much of an) Emulation layer for 32bit guests.
*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* based on arch/arm/kvm/emulate.c
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
* Author: Christoffer Dall <c.dall@virtualopensystems.com>
*/
#include <linux/bits.h>
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
#define DFSR_FSC_EXTABT_LPAE 0x10
#define DFSR_FSC_EXTABT_nLPAE 0x08
#define DFSR_LPAE BIT(9)
static bool pre_fault_synchronize(struct kvm_vcpu *vcpu)
{
preempt_disable();
if (vcpu->arch.sysregs_loaded_on_cpu) {
kvm_arch_vcpu_put(vcpu);
return true;
}
preempt_enable();
return false;
}
static void post_fault_synchronize(struct kvm_vcpu *vcpu, bool loaded)
{
if (loaded) {
kvm_arch_vcpu_load(vcpu, smp_processor_id());
preempt_enable();
}
}
void kvm_inject_undef32(struct kvm_vcpu *vcpu)
{
vcpu->arch.flags |= (KVM_ARM64_EXCEPT_AA32_UND |
KVM_ARM64_PENDING_EXCEPTION);
}
/*
* Modelled after TakeDataAbortException() and TakePrefetchAbortException
* pseudocode.
*/
static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
unsigned long addr)
{
u32 *far, *fsr;
bool is_lpae;
bool loaded;
loaded = pre_fault_synchronize(vcpu);
if (is_pabt) {
vcpu->arch.flags |= (KVM_ARM64_EXCEPT_AA32_IABT |
KVM_ARM64_PENDING_EXCEPTION);
far = &vcpu_cp15(vcpu, c6_IFAR);
fsr = &vcpu_cp15(vcpu, c5_IFSR);
} else { /* !iabt */
vcpu->arch.flags |= (KVM_ARM64_EXCEPT_AA32_DABT |
KVM_ARM64_PENDING_EXCEPTION);
far = &vcpu_cp15(vcpu, c6_DFAR);
fsr = &vcpu_cp15(vcpu, c5_DFSR);
}
*far = addr;
/* Give the guest an IMPLEMENTATION DEFINED exception */
is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
if (is_lpae) {
*fsr = DFSR_LPAE | DFSR_FSC_EXTABT_LPAE;
} else {
/* no need to shuffle FS[4] into DFSR[10] as its 0 */
*fsr = DFSR_FSC_EXTABT_nLPAE;
}
post_fault_synchronize(vcpu, loaded);
}
void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr)
{
inject_abt32(vcpu, false, addr);
}
void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr)
{
inject_abt32(vcpu, true, addr);
}

75
arch/arm64/kvm/inject_fault.c
View file

@ -66,6 +66,75 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
vcpu_write_sys_reg(vcpu, esr, ESR_EL1);
}
#define DFSR_FSC_EXTABT_LPAE 0x10
#define DFSR_FSC_EXTABT_nLPAE 0x08
#define DFSR_LPAE BIT(9)
static bool pre_fault_synchronize(struct kvm_vcpu *vcpu)
{
preempt_disable();
if (vcpu->arch.sysregs_loaded_on_cpu) {
kvm_arch_vcpu_put(vcpu);
return true;
}
preempt_enable();
return false;
}
static void post_fault_synchronize(struct kvm_vcpu *vcpu, bool loaded)
{
if (loaded) {
kvm_arch_vcpu_load(vcpu, smp_processor_id());
preempt_enable();
}
}
static void inject_undef32(struct kvm_vcpu *vcpu)
{
vcpu->arch.flags |= (KVM_ARM64_EXCEPT_AA32_UND |
KVM_ARM64_PENDING_EXCEPTION);
}
/*
* Modelled after TakeDataAbortException() and TakePrefetchAbortException
* pseudocode.
*/
static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
unsigned long addr)
{
u32 *far, *fsr;
bool is_lpae;
bool loaded;
loaded = pre_fault_synchronize(vcpu);
if (is_pabt) {
vcpu->arch.flags |= (KVM_ARM64_EXCEPT_AA32_IABT |
KVM_ARM64_PENDING_EXCEPTION);
far = &vcpu_cp15(vcpu, c6_IFAR);
fsr = &vcpu_cp15(vcpu, c5_IFSR);
} else { /* !iabt */
vcpu->arch.flags |= (KVM_ARM64_EXCEPT_AA32_DABT |
KVM_ARM64_PENDING_EXCEPTION);
far = &vcpu_cp15(vcpu, c6_DFAR);
fsr = &vcpu_cp15(vcpu, c5_DFSR);
}
*far = addr;
/* Give the guest an IMPLEMENTATION DEFINED exception */
is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
if (is_lpae) {
*fsr = DFSR_LPAE | DFSR_FSC_EXTABT_LPAE;
} else {
/* no need to shuffle FS[4] into DFSR[10] as its 0 */
*fsr = DFSR_FSC_EXTABT_nLPAE;
}
post_fault_synchronize(vcpu, loaded);
}
/**
* kvm_inject_dabt - inject a data abort into the guest
* @vcpu: The VCPU to receive the data abort
@ -77,7 +146,7 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
{
if (vcpu_el1_is_32bit(vcpu))
kvm_inject_dabt32(vcpu, addr);
inject_abt32(vcpu, false, addr);
else
inject_abt64(vcpu, false, addr);
}
@ -93,7 +162,7 @@ void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
{
if (vcpu_el1_is_32bit(vcpu))
kvm_inject_pabt32(vcpu, addr);
inject_abt32(vcpu, true, addr);
else
inject_abt64(vcpu, true, addr);
}
@ -108,7 +177,7 @@ void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
void kvm_inject_undefined(struct kvm_vcpu *vcpu)
{
if (vcpu_el1_is_32bit(vcpu))
kvm_inject_undef32(vcpu);
inject_undef32(vcpu);
else
inject_undef64(vcpu);
}