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 3/3] KVM: x86: Sync the states size with the XCR0/IA32_XSS at, any time
Date: Wed, 26 Jan 2022 17:22:26 +0000 [thread overview]
Message-ID: <20220126172226.2298529-4-seanjc@google.com> (raw)
In-Reply-To: <20220126172226.2298529-1-seanjc@google.com>
From: Like Xu <likexu@tencent.com>
XCR0 is reset to 1 by RESET but not INIT and IA32_XSS is zeroed by
both RESET and INIT. The kvm_set_msr_common()'s handling of MSR_IA32_XSS
also needs to update kvm_update_cpuid_runtime(). In the above cases, the
size in bytes of the XSAVE area containing all states enabled by XCR0 or
(XCRO | IA32_XSS) needs to be updated.
For simplicity and consistency, existing helpers are used to write values
and call kvm_update_cpuid_runtime(), and it's not exactly a fast path.
Fixes: a554d207dc46 ("KVM: X86: Processor States following Reset or INIT")
Cc: stable@vger.kernel.org
Signed-off-by: Like Xu <likexu@tencent.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/x86.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 13793582f26d..2e8a8fb42269 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11257,8 +11257,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
vcpu->arch.msr_misc_features_enables = 0;
- vcpu->arch.xcr0 = XFEATURE_MASK_FP;
- vcpu->arch.ia32_xss = 0;
+ __kvm_set_xcr(vcpu, 0, XFEATURE_MASK_FP);
+ __kvm_set_msr(vcpu, MSR_IA32_XSS, 0, true);
}
/* All GPRs except RDX (handled below) are zeroed on RESET/INIT. */
--
2.35.0.rc0.227.g00780c9af4-goog
next prev parent reply other threads:[~2022-01-26 17:23 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 ` [PATCH 2/3] KVM: x86: Update vCPU's runtime CPUID on write to MSR_IA32_XSS Sean Christopherson
2022-01-26 17:22 ` Sean Christopherson [this message]
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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