linux-kernel - Re: [PATCH 1/3] xen: rework xen_pv

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Message-ID: <c6bb835a-40dc-44b6-8f95-4254f10db98a@amd.com>
Date: Wed, 27 Aug 2025 09:59:01 -0400
From: Jason Andryuk <jason.andryuk@....com>
To: Juergen Gross <jgross@...e.com>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>
CC: Boris Ostrovsky <boris.ostrovsky@...cle.com>, Thomas Gleixner
	<tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov
	<bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin"
	<hpa@...or.com>, Stefano Stabellini <sstabellini@...nel.org>, "Oleksandr
 Tyshchenko" <oleksandr_tyshchenko@...m.com>, <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 1/3] xen: rework xen_pv_domain()

On 2025-08-26 10:56, Juergen Gross wrote:
> Rework xen_pv_domain() to no longer use the xen_domain_type variable,
> but the artificial X86_FEATURE_XENPV cpu feature.
> 
> On non-x86 architectures xen_pv_domain() can be defined as "0".
> 
> This has the advantage that a kernel not built with CONFIG_XEN_PV
> will be smaller due to dead code elimination.
> 
> Set the X86_FEATURE_XENPV feature very early, as xen_pv_domain() is
> used rather early, too.
> 
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Jason Andryuk <jason.andryuk@....com>