[PATCH v5 03/19] KVM:x86: Report XSS as to-be-saved if there are supported features

Yang Weijiang
2023-08-03T07:37:12Z

From: Sean Christopherson <seanjc@google.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 <seanjc@google.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 a6b9bea62fb8..0b9033551d8c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1451,6 +1451,7 @@ static const u32 msrs_to_save_base[] = {
MSR_IA32_UMWAIT_CONTROL,

MSR_IA32_XFD, MSR_IA32_XFD_ERR,
+ MSR_IA32_XSS,
};

static const u32 msrs_to_save_pmu[] = {
@@ -7172,6 +7173,10 @@ static void kvm_probe_msr_to_save(u32 msr_index)
if (!(kvm_get_arch_capabilities() & ARCH_CAP_TSX_CTRL_MSR))
return;
break;
+ case MSR_IA32_XSS:
+ if (!kvm_caps.supported_xss)
+ return;
+ break;
default:
break;
}
--
2.27.0