On 2013-12-30 21:56, Zhihui Zhang wrote: > According to Table C-1 of Intel SDM 3C, a VM exit happens on an I/O instruction when > "use I/O bitmaps" VM-execution control was 0 _and_ the "unconditional I/O exiting" > VM-execution control was 1. So we can't just check "unconditional I/O exiting" alone. > This patch was improved by suggestion from Jan Kiszka. > > Signed-off-by: Zhihui Zhang <zzhsuny@xxxxxxxxx> > --- > arch/x86/kvm/vmx.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c > index b2fe1c2..45617db 100644 > --- a/arch/x86/kvm/vmx.c > +++ b/arch/x86/kvm/vmx.c > @@ -6460,11 +6460,8 @@ static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu, > int size; > u8 b; > > - if (nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING)) > - return 1; > - > if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS)) > - return 0; > + return nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING); > > exit_qualification = vmcs_readl(EXIT_QUALIFICATION); > > Reviewed-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
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