linux-kernel - Re: [RFC PATCH V5 0/4] x86/Hyper-V: Add AMD Secure AVIC for Hyper-V platform

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Message-ID: <83ae59ce-99f9-45b2-b6f8-4b4859b191c2@linux.microsoft.com>
Date: Wed, 6 Aug 2025 11:12:29 +0530
From: Naman Jain <namjain@...ux.microsoft.com>
To: Tianyu Lan <ltykernel@...il.com>, kys@...rosoft.com,
 haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com, arnd@...db.de,
 Neeraj.Upadhyay@....com, kvijayab@....com
Cc: Tianyu Lan <tiala@...rosoft.com>, linux-arch@...r.kernel.org,
 linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V5 0/4] x86/Hyper-V: Add AMD Secure AVIC for Hyper-V
 platform



On 8/4/2025 11:35 PM, Tianyu Lan wrote:
> From: Tianyu Lan <tiala@...rosoft.com>
> 
> 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.
> 
> This patchset is based on the AMD patchset "AMD: Add
> Secure AVIC Guest Support"
> 


NIT:
Generally RFC tag is meant to be used for the patches which are probably 
not ready for merging, and is mostly intended for having a discussion 
around your changes. Since this is now reviewed by multiple people and 
have gone through multiple versions already, if you feel this can be 
merged, you can remove RFC tags in next version, if you are planning to 
send it.

Regards,
Naman