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kvm, vmx: Fix lazy FPU on nested guest

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If a nested guest does a NM fault but its CR0 doesn't contain the TS
flag (because it was already cleared by the guest with L1 aid) then we
have to activate FPU ourselves in L0 and then continue to L2. If TS flag
is set then we fallback on the previous behavior, forward the fault to
L1 if it asked for.

Signed-off-by: Anthoine Bourgeois <bourgeois@bertin.fr>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Anthoine Bourgeois 2013-11-13 11:45:37 +01:00 committed by Paolo Bonzini
parent ede5822242
commit e504c9098e
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/vmx.c
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@ -6643,6 +6643,9 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
return 0;
else if (is_page_fault(intr_info))
return enable_ept;
else if (is_no_device(intr_info) &&
!(nested_read_cr0(vmcs12) & X86_CR0_TS))
return 0;
return vmcs12->exception_bitmap &
(1u << (intr_info & INTR_INFO_VECTOR_MASK));
case EXIT_REASON_EXTERNAL_INTERRUPT: