Randy Dunlap wrote on 2013-04-18: > On 04/17/13 17:35, Zhang, Yang Z wrote: >> David Rientjes wrote on 2013-04-18: >>> On Wed, 17 Apr 2013, Randy Dunlap wrote: >>> >>>> On 04/17/13 16:12, David Rientjes wrote: >>>>> The build fails when CONFIG_SMP is disabled: >>>>> >>>>> arch/x86/kvm/vmx.c: In function 'vmx_deliver_posted_interrupt': >>>>> arch/x86/kvm/vmx.c:3950:3: error: 'apic' undeclared (first use in >>>>> this function) >>>>> >>>>> Fix it by including the necessary header. >>>> >>>> Sorry, i386 build still fails with the same error message plus this one: >>>> >>>> ERROR: "apic" [arch/x86/kvm/kvm-intel.ko] undefined! >>>> >>> >>> Ahh, that's because you don't have CONFIG_X86_LOCAL_APIC as you already >>> mentioned. So it looks like this error can manifest in two different ways >>> and we got different reports. >>> >>> This failure came from "KVM: VMX: Add the deliver posted interrupt >>> algorithm", so adding Yang to the cc to specify the dependency this has on >>> apic and how it can be protected without CONFIG_X86_LOCAL_APIC on i386. >> How about the follow patch? >> >> commit a49dd819f502c1029c5a857e87201ef25ec06ce6 >> Author: Yang Zhang <yang.z.zhang@xxxxxxxxx> >> Date: Wed Apr 17 05:34:07 2013 -0400 >> >> KVM: x86: Don't sending posted interrupt if not config CONFIG_SMP >> >> In UP, posted interrupt logic will not work. So we should not send >> posted interrupt and let vcpu to pick the pending interrupt before >> vmentry. >> >> Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx> > > Missing Reported-by: and the patch does not apply cleanly (looks like > lots of spaces instead of tabs in it)... but it does build now after > massaging the patch. Thanks. Just copy it to you for a quick testing. I will resend a formal patch. > Thanks. > > Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> > > >> >> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index >> 52b21da..d5c6b95 100644 --- a/arch/x86/kvm/vmx.c +++ >> b/arch/x86/kvm/vmx.c @@ -3946,10 +3946,12 @@ static void >> vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector) >> >> r = pi_test_and_set_on(&vmx->pi_desc); >> kvm_make_request(KVM_REQ_EVENT, vcpu); +#ifdef CONFIG_SMP if >> (!r && (vcpu->mode == IN_GUEST_MODE)) >> apic->send_IPI_mask(get_cpu_mask(vcpu->cpu), >> POSTED_INTR_VECTOR); >> else >> +#endif >> kvm_vcpu_kick(vcpu); >> } >> Best regards, >> Yang >> >> > > > -- > ~Randy > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Best regards, Yang -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
