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

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Message-ID: <f0077c58-9192-9c81-6c2d-df845bfb7815@citrix.com>
Date:   Fri, 4 Aug 2023 11:25:34 +0100
From:   Andrew Cooper <andrew.cooper3@...rix.com>
To:     Xin Li <xin3.li@...el.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     Andy Lutomirski <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,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <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?

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).

~Andrew