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    Subject[RESEND PATCH v4 08/10] 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.

    Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
    Message-Id: <20210203113421.5759-2-weijiang.yang@intel.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    ---
    arch/x86/kvm/x86.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index 3a67ad29fa9d..b699f7a37b1a 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -1298,6 +1298,8 @@ static const u32 msrs_to_save_all[] = {
    MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13,
    MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15,
    MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
    +
    + MSR_IA32_XSS,
    };

    static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
    @@ -6035,6 +6037,10 @@ static void kvm_init_msr_list(void)
    min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
    continue;
    break;
    + case MSR_IA32_XSS:
    + if (!supported_xss)
    + continue;
    + break;
    default:
    break;
    }
    --
    2.31.1
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