Commit ccf9844e authored by Paolo Bonzini's avatar Paolo Bonzini

kvm, vmx: Really fix lazy FPU on nested guest

Commit e504c909 (kvm, vmx: Fix lazy FPU on nested guest, 2013-11-13)
highlighted a real problem, but the fix was subtly wrong.

nested_read_cr0 is the CR0 as read by L2, but here we want to look at
the CR0 value reflecting L1's setup.  In other words, L2 might think
that TS=0 (so nested_read_cr0 has the bit clear); but if L1 is actually
running it with TS=1, we should inject the fault into L1.

The effective value of CR0 in L2 is contained in vmcs12->guest_cr0, use
it.

Fixes: e504c909Reported-by: default avatarKashyap Chamarty <kchamart@redhat.com>
Reported-by: default avatarStefan Bader <stefan.bader@canonical.com>
Tested-by: default avatarKashyap Chamarty <kchamart@redhat.com>
Tested-by: default avatarAnthoine Bourgeois <bourgeois@bertin.fr>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 684851a1
......@@ -6699,7 +6699,7 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
else if (is_page_fault(intr_info))
return enable_ept;
else if (is_no_device(intr_info) &&
!(nested_read_cr0(vmcs12) & X86_CR0_TS))
!(vmcs12->guest_cr0 & X86_CR0_TS))
return 0;
return vmcs12->exception_bitmap &
(1u << (intr_info & INTR_INFO_VECTOR_MASK));
......
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