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KVM: arm64: Get rid of vCPU-scoped feature bitmap

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The vCPU-scoped feature bitmap was left in place a couple of releases
ago in case the change to VM-scoped vCPU features broke anyone. Nobody
has complained and the interop between VM and vCPU bitmaps is pretty
gross. Throw it out.

Link: https://lore.kernel.org/r/20230920195036.1169791-9-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2023-09-20 19:50:36 +00:00
parent 3d4b2a4cdd
commit 1de10b7d13
8 changed files with 18 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arm64/include/asm/kvm_emulate.h
View File

@ -54,6 +54,11 @@ void kvm_emulate_nested_eret(struct kvm_vcpu *vcpu);
int kvm_inject_nested_sync(struct kvm_vcpu *vcpu, u64 esr_el2);
int kvm_inject_nested_irq(struct kvm_vcpu *vcpu);
static inline bool vcpu_has_feature(const struct kvm_vcpu *vcpu, int feature)
{
return test_bit(feature, vcpu->kvm->arch.vcpu_features);
}
#if defined(__KVM_VHE_HYPERVISOR__) || defined(__KVM_NVHE_HYPERVISOR__)
static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
{
@ -62,7 +67,7 @@ static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
#else
static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
{
return test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features);
return vcpu_has_feature(vcpu, KVM_ARM_VCPU_EL1_32BIT);
}
#endif
@ -565,12 +570,6 @@ static __always_inline void kvm_incr_pc(struct kvm_vcpu *vcpu)
vcpu_set_flag((v), e); \
} while (0)
static inline bool vcpu_has_feature(struct kvm_vcpu *vcpu, int feature)
{
return test_bit(feature, vcpu->arch.features);
}
static __always_inline void kvm_write_cptr_el2(u64 val)
{
if (has_vhe() || has_hvhe())

3
arch/arm64/include/asm/kvm_host.h
View File

@ -574,9 +574,6 @@ struct kvm_vcpu_arch {
/* Cache some mmu pages needed inside spinlock regions */
struct kvm_mmu_memory_cache mmu_page_cache;
/* feature flags */
DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
/* Virtual SError ESR to restore when HCR_EL2.VSE is set */
u64 vsesr_el2;

3
arch/arm64/include/asm/kvm_nested.h
View File

@ -2,13 +2,14 @@
#ifndef __ARM64_KVM_NESTED_H
#define __ARM64_KVM_NESTED_H
#include <asm/kvm_emulate.h>
#include <linux/kvm_host.h>
static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu)
{
return (!__is_defined(__KVM_NVHE_HYPERVISOR__) &&
cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) &&
test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features));
vcpu_has_feature(vcpu, KVM_ARM_VCPU_HAS_EL2));
}
extern bool __check_nv_sr_forward(struct kvm_vcpu *vcpu);

9
arch/arm64/kvm/arm.c
View File

@ -367,7 +367,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
/* Force users to call KVM_ARM_VCPU_INIT */
vcpu_clear_flag(vcpu, VCPU_INITIALIZED);
bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
@ -1263,7 +1262,8 @@ static bool kvm_vcpu_init_changed(struct kvm_vcpu *vcpu,
{
unsigned long features = init->features[0];
return !bitmap_equal(vcpu->arch.features, &features, KVM_VCPU_MAX_FEATURES);
return !bitmap_equal(vcpu->kvm->arch.vcpu_features, &features,
KVM_VCPU_MAX_FEATURES);
}
static int __kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
@ -1276,15 +1276,14 @@ static int __kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
mutex_lock(&kvm->arch.config_lock);
if (test_bit(KVM_ARCH_FLAG_VCPU_FEATURES_CONFIGURED, &kvm->arch.flags) &&
!bitmap_equal(kvm->arch.vcpu_features, &features, KVM_VCPU_MAX_FEATURES))
kvm_vcpu_init_changed(vcpu, init))
goto out_unlock;
bitmap_copy(vcpu->arch.features, &features, KVM_VCPU_MAX_FEATURES);
bitmap_copy(kvm->arch.vcpu_features, &features, KVM_VCPU_MAX_FEATURES);
/* Now we know what it is, we can reset it. */
kvm_reset_vcpu(vcpu);
bitmap_copy(kvm->arch.vcpu_features, &features, KVM_VCPU_MAX_FEATURES);
set_bit(KVM_ARCH_FLAG_VCPU_FEATURES_CONFIGURED, &kvm->arch.flags);
vcpu_set_flag(vcpu, VCPU_INITIALIZED);
ret = 0;

2
arch/arm64/kvm/hypercalls.c
View File

@ -554,7 +554,7 @@ int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
bool wants_02;
wants_02 = test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features);
wants_02 = vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2);
switch (val) {
case KVM_ARM_PSCI_0_1:

6
arch/arm64/kvm/reset.c
View File

@ -208,14 +208,14 @@ void kvm_reset_vcpu(struct kvm_vcpu *vcpu)
kvm_arch_vcpu_put(vcpu);
if (!kvm_arm_vcpu_sve_finalized(vcpu)) {
if (test_bit(KVM_ARM_VCPU_SVE, vcpu->arch.features))
if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_SVE))
kvm_vcpu_enable_sve(vcpu);
} else {
kvm_vcpu_reset_sve(vcpu);
}
if (test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||
test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features))
if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_PTRAUTH_ADDRESS) ||
vcpu_has_feature(vcpu, KVM_ARM_VCPU_PTRAUTH_GENERIC))
kvm_vcpu_enable_ptrauth(vcpu);
if (vcpu_el1_is_32bit(vcpu))

2
include/kvm/arm_pmu.h
View File

@ -77,7 +77,7 @@ void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu);
void kvm_vcpu_pmu_resync_el0(void);
#define kvm_vcpu_has_pmu(vcpu) \
(test_bit(KVM_ARM_VCPU_PMU_V3, (vcpu)->arch.features))
(vcpu_has_feature(vcpu, KVM_ARM_VCPU_PMU_V3))
/*
* Updates the vcpu's view of the pmu events for this cpu.

2
include/kvm/arm_psci.h
View File

@ -26,7 +26,7 @@ static inline int kvm_psci_version(struct kvm_vcpu *vcpu)
* revisions. It is thus safe to return the latest, unless
* userspace has instructed us otherwise.
*/
if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features)) {
if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2)) {
if (vcpu->kvm->arch.psci_version)
return vcpu->kvm->arch.psci_version;