[PATCH v2 02/15] KVM: x86: Report XSS as an MSR to be saved if there are supported features

Yang Weijiang
2022-11-25T06:10:07Z

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>
---
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 f18f579ebde8..16726b44061b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1465,6 +1465,7 @@ static const u32 msrs_to_save_all[] = {
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)];
@@ -7061,6 +7062,10 @@ 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