linux-kernel - Re: [PATCH][GIT PULL][3.8] x86: Don't clobber top of pt

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Date:	Mon, 05 Nov 2012 08:58:33 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	"Salman Qazi" <sqazi@...gle.com>, "Ingo Molnar" <mingo@...nel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][GIT PULL][3.8] x86: Don't clobber top of pt_regs
 in nested NMI

>>> On 02.11.12 at 20:19, Steven Rostedt <rostedt@...dmis.org> wrote:
> @@ -1842,8 +1851,12 @@ nmi_swapgs:
>  	SWAPGS_UNSAFE_STACK
>  nmi_restore:
>  	RESTORE_ALL 8
> +
> +	/* Pop the extra iret frame */
> +	addq $(5*8), %rsp

This could (for code efficiency) and should (for CFI annotation
correctness) be folded into the RESTORE_ALL above (by
converting "8" to "6*8").

Jan

> +
>  	/* Clear the NMI executing stack variable */
> -	movq $0, 10*8(%rsp)
> +	movq $0, 5*8(%rsp)
>  	jmp irq_return
>  	CFI_ENDPROC
>  END(nmi)


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