linux-kernel - Re: [PATCH v6 1/3] x86/paravirt: Move halt paravirt calls under CONFIG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <9e6ee367-41c6-47b2-ac64-1bdb0794cb47@suse.com>
Date: Tue, 25 Feb 2025 07:44:32 +0100
From: Juergen Gross <jgross@...e.com>
To: Vishal Annapurve <vannapurve@...gle.com>, dave.hansen@...ux.intel.com,
 kirill.shutemov@...ux.intel.com, ajay.kaher@...adcom.com,
 ak@...ux.intel.com, tony.luck@...el.com, thomas.lendacky@....com
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
 pbonzini@...hat.com, seanjc@...gle.com, kai.huang@...el.com,
 chao.p.peng@...ux.intel.com, isaku.yamahata@...il.com,
 sathyanarayanan.kuppuswamy@...ux.intel.com, erdemaktas@...gle.com,
 ackerleytng@...gle.com, jxgao@...gle.com, sagis@...gle.com,
 afranji@...gle.com, kees@...nel.org, jikos@...nel.org, peterz@...radead.org,
 x86@...nel.org, linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev,
 virtualization@...ts.linux.dev, bcm-kernel-feedback-list@...adcom.com,
 stable@...r.kernel.org
Subject: Re: [PATCH v6 1/3] x86/paravirt: Move halt paravirt calls under
 CONFIG_PARAVIRT

On 25.02.25 01:47, Vishal Annapurve wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> 
> CONFIG_PARAVIRT_XXL is mainly defined/used by XEN PV guests. For
> other VM guest types, features supported under CONFIG_PARAVIRT
> are self sufficient. CONFIG_PARAVIRT mainly provides support for
> TLB flush operations and time related operations.
> 
> For TDX guest as well, paravirt calls under CONFIG_PARVIRT meets
> most of its requirement except the need of HLT and SAFE_HLT
> paravirt calls, which is currently defined under
> CONFIG_PARAVIRT_XXL.
> 
> Since enabling CONFIG_PARAVIRT_XXL is too bloated for TDX guest
> like platforms, move HLT and SAFE_HLT paravirt calls under
> CONFIG_PARAVIRT.
> 
> Moving HLT and SAFE_HLT paravirt calls are not fatal and should not
> break any functionality for current users of CONFIG_PARAVIRT.
> 
> Cc: stable@...r.kernel.org
> Fixes: bfe6ed0c6727 ("x86/tdx: Add HLT support for TDX guests")
> Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Reviewed-by: Andi Kleen <ak@...ux.intel.com>
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen

Download attachment "OpenPGP_0xB0DE9DD628BF132F.asc" of type "application/pgp-keys" (3684 bytes)

Download attachment "OpenPGP_signature.asc" of type "application/pgp-signature" (496 bytes)