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

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Message-ID: <f3c20dd0-9914-f646-0aaa-400dffd2bb2b@suse.com>
Date:   Fri, 4 Aug 2023 12:35:23 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Andrew Cooper <andrew.cooper3@...rix.com>,
        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>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [RFC PATCH 1/1] x86/traps: Get rid of exception handlers' second
 argument error code

On 04.08.23 12:25, Andrew Cooper wrote:
> 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).

The only adaption of Xen code will need to happen for the only use of
DEFINE_IDTENTRY_RAW_ERRORCODE() there, and this you have covered in your
patch already.


Juergen


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