linux-kernel - Re: [PATCH 0/4] x86/xen: do some paravirt cleanup

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Message-ID: <20201117100017.GB3121406@hirez.programming.kicks-ass.net>
Date:   Tue, 17 Nov 2020 11:00:17 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Deep Shah <sdeep@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>
Subject: Re: [PATCH 0/4] x86/xen: do some paravirt cleanup

On Mon, Nov 16, 2020 at 04:22:57PM +0100, Juergen Gross wrote:
> Eliminate the usergs_sysret64 paravirt call completely and switch
> the swapgs one to use ALTERNATIVE instead. This requires to fix the
> IST based exception entries for Xen PV to use the same mechanism as
> NMI and debug exception already do.
> 
> Juergen Gross (4):
>   x86/xen: use specific Xen pv interrupt entry for MCE
>   x86/xen: use specific Xen pv interrupt entry for DF
>   x86/pv: switch SWAPGS to ALTERNATIVE
>   x86/xen: drop USERGS_SYSRET64 paravirt call

Looks 'sane' :-))

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>