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

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Date:   Fri, 4 Aug 2023 17:20:30 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     "Gross, Jurgen" <jgross@...e.com>,
        "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>,
        "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?
> >
> > 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.

Thanks for checking it for me.