linux-kernel - Re: [PATCH 09/18] x86/asm/64: De-Xen-ify our NMI code

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Date:   Thu, 26 Oct 2017 10:41:18 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>
Cc:     Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH 09/18] x86/asm/64: De-Xen-ify our NMI code

On 26/10/17 10:26, Andy Lutomirski wrote:
> Xen PV is fundamentally incompatible with our fancy NMI code: it
> doesn't use IST at all, and Xen entries clobber two stack slots
> below the hardware frame.
> 
> Drop Xen PV support from our NMI code entirely.
> 
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Signed-off-by: Andy Lutomirski <luto@...nel.org>

Acked-by: Juergen Gross <jgross@...e.com>


Juergen