On 11/03/15 15:58, Janusz Mocek wrote: > W dniu 03.11.2015 o 14:31, Laszlo Ersek pisze: >> On 11/03/15 13:34, Paolo Bonzini wrote: >>> >>> On 03/11/2015 02:14, Laszlo Ersek wrote: >>>> Anyway, with the following host kernel change, the AP startup problem >>>> goes away (tested on top of v4.3): >>>> >>>>>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c >>>>>> index 9a9a198..4f978ad 100644 >>>>>> --- a/arch/x86/kvm/x86.c >>>>>> +++ b/arch/x86/kvm/x86.c >>>>>> @@ -622,7 +622,8 @@ int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long >>>>>> cr0) >>>>>> if ((cr0 ^ old_cr0) & update_bits) >>>>>> kvm_mmu_reset_context(vcpu); >>>>>> >>>>>> - if ((cr0 ^ old_cr0) & X86_CR0_CD) >>>>>> + if (!kvm_check_has_quirk(vcpu->kvm, >>>>>> KVM_X86_QUIRK_CD_NW_CLEARED) && >>>>>> + (cr0 ^ old_cr0) & X86_CR0_CD) >>>>>> kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL); >>>>>> >>>>>> return 0; >>>> (Honestly I just imitated fb279950ba here; I'm not making any better >>>> argument for this diff. But, independently, I wonder why this hunk >>>> didn't have the noncoherent DMA check either, originally.) >>> Great job. I look forward to the testing results. >>> >>> It should also have the noncoherent DMA check, in fact, though that's >>> just an optimization and it would have masked the bug on your system. >> Thank you! I'll wait for Janusz's results, and if stuff works, I'll post >> the patch with the update you're suggesting (zap only if the guest has >> noncoherent DMA and lacks the quirk). >> >> Laszlo >> >>> Thanks, >>> >>> Paolo >>> >>>> Janusz, could you rebuild your host kernel with this patch, and share >>>> the results? (I'm also attaching the same as a formatted patch, so you >>>> can apply it with "git am" easily.) > Looks like its working correctly now >
Awesome, thank you for testing it. I'll put together a patch. Laszlo _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
