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KVM: x86: Use KVM-governed feature framework to track "LAM enabled" 

JIRA: https://issues.redhat.com/browse/RHEL-32430

commit 183bdd161c2b773a62f01d1c030f5a3a5b7c33b5
Author: Binbin Wu <binbin.wu@linux.intel.com>
Date:   Wed Sep 13 20:42:24 2023 +0800

    KVM: x86: Use KVM-governed feature framework to track "LAM enabled"

    Use the governed feature framework to track if Linear Address Masking (LAM)
    is "enabled", i.e. if LAM can be used by the guest.

    Using the framework to avoid the relative expensive call guest_cpuid_has()
    during cr3 and vmexit handling paths for LAM.

    No functional change intended.

    Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
    Tested-by: Xuelian Guo <xuelian.guo@intel.com>
    Link: https://lore.kernel.org/r/20230913124227.12574-14-binbin.wu@linux.intel.com
    Signed-off-by: Sean Christopherson <seanjc@google.com>

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
This commit is contained in:
Maxim Levitsky 2024-04-17 17:10:04 -04:00
parent 42c616078f
commit cbcd5a8c55
4 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/kvm/cpuid.h
View File

@ -276,8 +276,7 @@ static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
if (kvm_cpu_cap_has(X86_FEATURE_LAM) &&
guest_cpuid_has(vcpu, X86_FEATURE_LAM))
if (guest_can_use(vcpu, X86_FEATURE_LAM))
cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
return kvm_vcpu_is_legal_gpa(vcpu, cr3);

1
arch/x86/kvm/governed_features.h
View File

@ -16,6 +16,7 @@ KVM_GOVERNED_X86_FEATURE(PAUSEFILTER)
KVM_GOVERNED_X86_FEATURE(PFTHRESHOLD)
KVM_GOVERNED_X86_FEATURE(VGIF)
KVM_GOVERNED_X86_FEATURE(VNMI)
KVM_GOVERNED_X86_FEATURE(LAM)
#undef KVM_GOVERNED_X86_FEATURE
#undef KVM_GOVERNED_FEATURE

3
arch/x86/kvm/mmu.h
View File

@ -148,8 +148,7 @@ static inline unsigned long kvm_get_active_pcid(struct kvm_vcpu *vcpu)
static inline unsigned long kvm_get_active_cr3_lam_bits(struct kvm_vcpu *vcpu)
{
if (!kvm_cpu_cap_has(X86_FEATURE_LAM) ||
!guest_cpuid_has(vcpu, X86_FEATURE_LAM))
if (!guest_can_use(vcpu, X86_FEATURE_LAM))
return 0;
return kvm_read_cr3(vcpu) & (X86_CR3_LAM_U48 | X86_CR3_LAM_U57);

1
arch/x86/kvm/vmx/vmx.c
View File

@ -7763,6 +7763,7 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_XSAVES);
kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_VMX);
kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_LAM);
vmx_setup_uret_msrs(vmx);