[PATCH] SVM: set NM intercept when enabling CR0.TS in the guest

[PATCH] SVM: set NM intercept when enabling CR0.TS in the guest

[Joerg Roedel]

Explicitly enable the NM intercept in svm_set_cr0 if we enable TS in the guest
copy of CR0 for lazy FPU switching. This fixes guest SMP with Linux under SVM.
Without that patch Linux deadlocks or panics right after trying to boot the
other CPUs.

Signed-off-by: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
Signed-off-by: Markus Rechberger <markus.rechberger-5C7GfCeVMHo@public.gmane.org>
---
 arch/x86/kvm/svm.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 7bdbe16..d1c7fcb 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -792,8 +792,10 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 	vcpu->arch.cr0 = cr0;
 	cr0 |= X86_CR0_PG | X86_CR0_WP;
 	cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
-	if (!vcpu->fpu_active)
+	if (!vcpu->fpu_active) {
+		svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR);
 		cr0 |= X86_CR0_TS;
+	}
 	svm->vmcb->save.cr0 = cr0;
 }
 
-- 
1.5.3.7




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Re: [PATCH] SVM: set NM intercept when enabling CR0.TS in the guest

[Avi Kivity]

Joerg Roedel wrote:
> Explicitly enable the NM intercept in svm_set_cr0 if we enable TS in the guest
> copy of CR0 for lazy FPU switching. This fixes guest SMP with Linux under SVM.
> Without that patch Linux deadlocks or panics right after trying to boot the
> other CPUs.
>   

Applied, thanks.

-- 
error compiling committee.c: too many arguments to function


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