linux-kernel - Re: [PATCH 5/5] x86/Hyper-V: Add Hyper-V specific hvcall to set backing page

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Message-ID: <20250918195952.GFaMxkuFc1OqfWavWv@fat_crate.local>
Date: Thu, 18 Sep 2025 21:59:52 +0200
From: Borislav Petkov <bp@...en8.de>
To: Tianyu Lan <ltykernel@...il.com>
Cc: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
	decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
	arnd@...db.de, Neeraj.Upadhyay@....com, tiala@...rosoft.com,
	romank@...ux.microsoft.com, linux-arch@...r.kernel.org,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michael Kelley <mhklinux@...look.com>
Subject: Re: [PATCH 5/5] x86/Hyper-V: Add Hyper-V specific hvcall to set
 backing page

On Fri, Sep 19, 2025 at 01:11:02AM +0800, Tianyu Lan wrote:
> Could I move the check into savic_register_gpa() or add a stub function
> to check guest runs on Hyper-V  or not and then call associated function
> to register APIC backing page?

You probably should do

static struct apic apic_x2apic_savic_hyperv

and copy the apic_x2apic_savic contents into it and overwrite the .setup
function with your variant.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette