Re: [PATCH 0/5] x86/Hyper-V: Add AMD Secure AVIC for Hyper-V platform

Wei Liu
2025-10-13T17:18:50Z

On Tue, Sep 30, 2025 at 11:05:34PM +0000, Wei Liu wrote:
> On Thu, Sep 18, 2025 at 11:00:18AM -0400, Tianyu Lan wrote:
> > Secure AVIC is a new hardware feature in the AMD64
> > architecture to allow SEV-SNP guests to prevent the
> > hypervisor from generating unexpected interrupts to
> > a vCPU or otherwise violate architectural assumptions
> > around APIC behavior.
> >
> > Each vCPU has a guest-allocated APIC backing page of
> > size 4K, which maintains APIC state for that vCPU.
> > APIC backing page's ALLOWED_IRR field indicates the
> > interrupt vectors which the guest allows the hypervisor
> > to send.
> >
> > This patchset is to enable the feature for Hyper-V
> > platform. Patch "Drivers: hv: Allow vmbus message
> > synic interrupt injected from Hyper-V" is to expose
> > new fucntion hv_enable_coco_interrupt() and device
> > driver and arch code may update AVIC backing page
> > ALLOWED_IRR field to allow Hyper-V inject associated
> > vector.
> >
> > The patchset is based on the tip tree commit 27a17e02418e
> > (x86/sev: Indicate the SEV-SNP guest supports Secure AVIC)
> >
> > Tianyu Lan (5):
> > x86/hyperv: Don't use hv apic driver when Secure AVIC is available
> > drivers: hv: Allow vmbus message synic interrupt injected from Hyper-V
> > x86/hyperv: Don't use auto-eoi when Secure AVIC is available
> > x86/hyperv: Allow Hyper-V to inject STIMER0 interrupts
>
> These look good to me.

I applied these four to hyperv-next.

>
> > x86/Hyper-V: Add Hyper-V specific hvcall to set backing page
>
> Please address Borislav's comment on this patch.

This is no longer needed.

Thanks,
Wei