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    Subject[PATCH 06/19] KVM: x86: Report XSS as an MSR to be saved if there are supported features
    Date
    From: Sean Christopherson <sean.j.christopherson@intel.com>

    Add MSR_IA32_XSS to the list of MSRs reported to userspace if
    supported_xss is non-zero, i.e. KVM supports at least one XSS based
    feature.

    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
    Message-Id: <20220517154100.29983-4-weijiang.yang@intel.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    ---
    arch/x86/kvm/x86.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index 2318a99139fa..f525228168b8 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -1446,6 +1446,7 @@ static const u32 msrs_to_save_all[] = {
    MSR_F15H_PERF_CTR0, MSR_F15H_PERF_CTR1, MSR_F15H_PERF_CTR2,
    MSR_F15H_PERF_CTR3, MSR_F15H_PERF_CTR4, MSR_F15H_PERF_CTR5,
    MSR_IA32_XFD, MSR_IA32_XFD_ERR,
    + MSR_IA32_XSS,
    };

    static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
    @@ -6780,6 +6781,10 @@ static void kvm_init_msr_list(void)
    if (!kvm_cpu_cap_has(X86_FEATURE_XFD))
    continue;
    break;
    + case MSR_IA32_XSS:
    + if (!kvm_caps.supported_xss)
    + continue;
    + break;
    default:
    break;
    }
    --
    2.27.0
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