On 04/05/2015 17:37, Radim Krčmář wrote:
> 2015-04-30 13:36+0200, Paolo Bonzini:
>> This patch includes changes to the external API for SMM support.
>> All the changes are predicated by the availability of a new
>> capability, KVM_CAP_X86_SMM, which is added at the end of the
>> patch series.
>>
>> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
>> ---
>> diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
>> @@ -820,11 +820,19 @@ struct kvm_vcpu_events {
>> } nmi;
>> __u32 sipi_vector;
>> __u32 flags;
>> + struct {
>> + __u8 smm;
>
> 34.3.1 Entering SMM:
> Subsequent SMI requests are not acknowledged while the processor is in
> SMM. The first SMI interrupt request that occurs while the processor
> is in SMM (that is, after SMM has been acknowledged to external
> hardware) is latched and serviced when the processor exits SMM with
> the RSM instruction. The processor will latch only one SMI while in
> SMM.
>
> The final code doesn't handle pending SMI's at all, so we'll need to
> store it somewhere and expose to userspace here.
Right, and I can add this to the slow path I already have for SMM exits:
+ if (ctxt->emul_flags != vcpu->arch.hflags) {
+ vcpu->arch.hflags = ctxt->emul_flags;
+ kvm_mmu_reset_context(vcpu);
+ }
Paolo
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