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From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Xiaoyao Li <xiaoyao.li@intel.com>, Like Xu <likexu@tencent.com>
Subject: [PATCH 2/3] KVM: x86: Update vCPU's runtime CPUID on write to MSR_IA32_XSS
Date: Wed, 26 Jan 2022 17:22:25 +0000	[thread overview]
Message-ID: <20220126172226.2298529-3-seanjc@google.com> (raw)
In-Reply-To: <20220126172226.2298529-1-seanjc@google.com>

From: Like Xu <likexu@tencent.com>

Do a runtime CPUID update for a vCPU if MSR_IA32_XSS is written, as the
size in bytes of the XSAVE area is affected by the states enabled in XSS.

Fixes: 203000993de5 ("kvm: vmx: add MSR logic for XSAVES")
Cc: stable@vger.kernel.org
Signed-off-by: Like Xu <likexu@tencent.com>
[sean: split out as a separate patch, adjust Fixes tag]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/x86.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c0727939684e..13793582f26d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3535,6 +3535,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		if (data & ~supported_xss)
 			return 1;
 		vcpu->arch.ia32_xss = data;
+		kvm_update_cpuid_runtime(vcpu);
 		break;
 	case MSR_SMI_COUNT:
 		if (!msr_info->host_initiated)
-- 
2.35.0.rc0.227.g00780c9af4-goog


  parent reply	other threads:[~2022-01-26 17:22 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-26 17:22 [PATCH 0/3] KVM: x86: XSS and XCR0 fixes Sean Christopherson
2022-01-26 17:22 ` [PATCH 1/3] KVM: x86: Keep MSR_IA32_XSS unchanged for INIT Sean Christopherson
2022-01-26 17:22 ` Sean Christopherson [this message]
2022-01-26 17:22 ` [PATCH 3/3] KVM: x86: Sync the states size with the XCR0/IA32_XSS at, any time Sean Christopherson
2022-01-26 17:43 ` [PATCH 0/3] KVM: x86: XSS and XCR0 fixes Paolo Bonzini
2022-01-26 17:48   ` Sean Christopherson
2022-01-27 12:09     ` Paolo Bonzini
2022-01-27 15:03       ` Sean Christopherson

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