From: Paolo Bonzini <pbonzini@xxxxxxxxxx> Refine the code path of the existing clearing of supported_xss in this way: initialize the supported_xss with the filter of KVM_SUPPORTED_XSS mask and update its value in a bit clear manner (rather than bit setting). Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx> Signed-off-by: Like Xu <like.xu@xxxxxxxxxxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Yang Weijiang <weijiang.yang@xxxxxxxxx> --- arch/x86/kvm/vmx/vmx.c | 5 +++-- arch/x86/kvm/x86.c | 6 +++++- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 9bd52ad3bbf4..2ab4c33b5008 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7738,9 +7738,10 @@ static __init void vmx_set_cpu_caps(void) kvm_cpu_cap_set(X86_FEATURE_UMIP); /* CPUID 0xD.1 */ - kvm_caps.supported_xss = 0; - if (!cpu_has_vmx_xsaves()) + if (!cpu_has_vmx_xsaves()) { kvm_cpu_cap_clear(X86_FEATURE_XSAVES); + kvm_caps.supported_xss = 0; + } /* CPUID 0x80000001 and 0x7 (RDPID) */ if (!cpu_has_vmx_rdtscp()) { diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 74c858eaa1ea..889be0c9176d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -217,6 +217,8 @@ static struct kvm_user_return_msrs __percpu *user_return_msrs; | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \ | XFEATURE_MASK_PKRU | XFEATURE_MASK_XTILE) +#define KVM_SUPPORTED_XSS 0 + u64 __read_mostly host_efer; EXPORT_SYMBOL_GPL(host_efer); @@ -11999,8 +12001,10 @@ int kvm_arch_hardware_setup(void *opaque) rdmsrl_safe(MSR_EFER, &host_efer); - if (boot_cpu_has(X86_FEATURE_XSAVES)) + if (boot_cpu_has(X86_FEATURE_XSAVES)) { rdmsrl(MSR_IA32_XSS, host_xss); + kvm_caps.supported_xss = host_xss & KVM_SUPPORTED_XSS; + } kvm_init_pmu_capability(); -- 2.27.0