linux-kernel - Re: [PATCH v2 0/3] Fix and cleanup for 32-bit PV sysexit

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Message-ID: <CALCETrUeGoeB8vNgbRNkFXjH0A570=M+4L1sRsfh-7btym59nA@mail.gmail.com>
Date:	Thu, 19 Nov 2015 14:07:02 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v2 0/3] Fix and cleanup for 32-bit PV sysexit

On Thu, Nov 19, 2015 at 1:55 PM, Boris Ostrovsky
<boris.ostrovsky@...cle.com> wrote:
> The first patch fixes Xen PV regression introduced by 32-bit rewrite. Unlike the
> earlier version it uses ALTERNATIVE instruction and avoids using xen_sysexit
> (and sysret32 in compat mode) pv ops, as suggested by Andy.
>
> As result of this patch irq_enable_sysexit and usergs_sysret32 pv ops are not
> used anymore by anyone and so can be removed.

This whole series is:

Acked-by: Andy Lutomirski <luto@...nel.org>

Now I just have to sucker someone into getting rid of
PARAVIRT_ADJUST_EXCEPTION_FRAME (by using stub entries) and the
overcomplicated syscall entry stuff.  :)  And whoever gets rid of
PARAVIRT_ADJUST_EXCEPTION_FRAME gets to wonder why it doesn't crash
and burn for NMIs on Xen, since I'm reasonably confident that it can't
possibly be correct.

--Andy
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