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x86/kvm/fpu: Remove kvm_vcpu_arch.guest_supported_xcr0

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kvm_vcpu_arch currently contains the guest supported features in both
guest_supported_xcr0 and guest_fpu.fpstate->user_xfeatures field.

Currently both fields are set to the same value in
kvm_vcpu_after_set_cpuid() and are not changed anywhere else after that.

Since it's not good to keep duplicated data, remove guest_supported_xcr0.

To keep the code more readable, introduce kvm_guest_supported_xcr()
and kvm_guest_supported_xfd() to replace the previous usages of
guest_supported_xcr0.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Message-Id: <20220217053028.96432-3-leobras@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Leonardo Bras 2022-02-17 02:30:30 -03:00 committed by Paolo Bonzini
parent ad856280dd
commit 988896bb61
3 changed files with 16 additions and 8 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -703,7 +703,6 @@ struct kvm_vcpu_arch {
struct fpu_guest guest_fpu;
u64 xcr0;
u64 guest_supported_xcr0;
struct kvm_pio_request pio;
void *pio_data;

5
arch/x86/kvm/cpuid.c
View File

@ -282,6 +282,7 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
struct kvm_cpuid_entry2 *best;
u64 guest_supported_xcr0;
best = kvm_find_cpuid_entry(vcpu, 1, 0);
if (best && apic) {
@ -293,10 +294,10 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
kvm_apic_set_version(vcpu);
}
vcpu->arch.guest_supported_xcr0 =
guest_supported_xcr0 =
cpuid_get_supported_xcr0(vcpu->arch.cpuid_entries, vcpu->arch.cpuid_nent);
vcpu->arch.guest_fpu.fpstate->user_xfeatures = vcpu->arch.guest_supported_xcr0;
vcpu->arch.guest_fpu.fpstate->user_xfeatures = guest_supported_xcr0;
kvm_update_pv_runtime(vcpu);

18
arch/x86/kvm/x86.c
View File

@ -984,6 +984,16 @@ void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_load_host_xsave_state);
static inline u64 kvm_guest_supported_xcr0(struct kvm_vcpu *vcpu)
{
return vcpu->arch.guest_fpu.fpstate->user_xfeatures;
}
static inline u64 kvm_guest_supported_xfd(struct kvm_vcpu *vcpu)
{
return kvm_guest_supported_xcr0(vcpu) & XFEATURE_MASK_USER_DYNAMIC;
}
static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
{
u64 xcr0 = xcr;
@ -1003,7 +1013,7 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
* saving. However, xcr0 bit 0 is always set, even if the
* emulated CPU does not support XSAVE (see kvm_vcpu_reset()).
*/
valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP;
valid_bits = kvm_guest_supported_xcr0(vcpu) | XFEATURE_MASK_FP;
if (xcr0 & ~valid_bits)
return 1;
@ -3706,8 +3716,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
!guest_cpuid_has(vcpu, X86_FEATURE_XFD))
return 1;
if (data & ~(XFEATURE_MASK_USER_DYNAMIC &
vcpu->arch.guest_supported_xcr0))
if (data & ~kvm_guest_supported_xfd(vcpu))
return 1;
fpu_update_guest_xfd(&vcpu->arch.guest_fpu, data);
@ -3717,8 +3726,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
!guest_cpuid_has(vcpu, X86_FEATURE_XFD))
return 1;
if (data & ~(XFEATURE_MASK_USER_DYNAMIC &
vcpu->arch.guest_supported_xcr0))
if (data & ~kvm_guest_supported_xfd(vcpu))
return 1;
vcpu->arch.guest_fpu.xfd_err = data;