linux-kernel - Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER

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Message-ID: <CA+55aFxVWj+25Er_nBqdsO=0s3HXqpTTwvQipxc=GO-zFwvHFQ@mail.gmail.com>
Date:	Thu, 25 Feb 2016 12:54:50 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Brian Gerst <brgerst@...il.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>
Subject: Re: [tip:x86/urgent] x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32

On Thu, Feb 25, 2016 at 11:31 AM, Brian Gerst <brgerst@...il.com> wrote:
>
> According to the SDM, popf will change IOPL only at CPL0,

Ok, so that's good enough for the native case, and adding a "popf"
would at least restore AC and IOPL.

                 Linus