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Message-Id: <20230914063325.85503-12-weijiang.yang@intel.com>
Date: Thu, 14 Sep 2023 02:33:11 -0400
From: Yang Weijiang <weijiang.yang@...el.com>
To: seanjc@...gle.com, pbonzini@...hat.com, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: dave.hansen@...el.com, peterz@...radead.org, chao.gao@...el.com,
rick.p.edgecombe@...el.com, weijiang.yang@...el.com,
john.allen@....com
Subject: [PATCH v6 11/25] KVM: x86: Report XSS as to-be-saved if there are supported features
From: Sean Christopherson <seanjc@...gle.com>
Add MSR_IA32_XSS to 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@...gle.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.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 e0b55c043dab..1258d1d6dd52 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1464,6 +1464,7 @@ 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[] = {
@@ -7195,6 +7196,10 @@ 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
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