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Message-ID: <1294932178-26866-2-git-send-email-joerg.roedel@amd.com> Date: Thu, 13 Jan 2011 16:22:57 +0100 From: Joerg Roedel <joerg.roedel@....com> To: Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com> CC: <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Joerg Roedel <joerg.roedel@....com>, <stable@...nel.org> Subject: [PATCH 1/2] KVM: SVM: Fix NMI path when NMI happens in guest mode The vmexit path on SVM needs to restore the KERNEL_GS_BASE MSR in order to savely execute the NMI handler. Otherwise a pending NMI can occur after the STGI instruction and crash the machine. This makes it impossible to run perf and kvm in parallel on an AMD machine in a stable way. Cc: stable@...nel.org Signed-off-by: Joerg Roedel <joerg.roedel@....com> --- arch/x86/kvm/svm.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 25bd1bc..8b9bc72 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -3637,6 +3637,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) #ifdef CONFIG_X86_64 wrmsrl(MSR_GS_BASE, svm->host.gs_base); + wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs); #else loadsegment(fs, svm->host.fs); #endif -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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