linux-kernel - RE: [RFC PATCH 1/1] x86/traps: Get rid of exception handlers' second argument error code

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Message-ID: <SA1PR11MB6734A92B97F4A4A51AE3CCCEA809A@SA1PR11MB6734.namprd11.prod.outlook.com>
Date:   Fri, 4 Aug 2023 17:19:45 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
CC:     "Lutomirski, Andy" <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Gross, Jurgen" <jgross@...e.com>,
        "Ostrovsky, Boris" <boris.ostrovsky@...cle.com>
Subject: RE: [RFC PATCH 1/1] x86/traps: Get rid of exception handlers' second
 argument error code

> On 04/08/2023 8:57 am, Xin Li wrote:
> > I haven't checked Xen implications with this change, i.e., does Xen
> > hypervisor need to adjust how it passes arguments to PV guests?
> 
> This is an internal detail of how Linux handles data on it's stacks, isn't it?

Yes, it is completely internal to Linux.

> The Xen code in Linux will need adjustment to match, but this is not a hypervisor
> ABI (which obviously can't and won't change).

You're right! Thanks for confirming!