linux-kernel - Re: [PATCH 2/2] Register native mce handler as vMCE bounce back point

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Message-ID: <20120416202821.GC14982@phenom.dumpdata.com>
Date:	Mon, 16 Apr 2012 16:28:21 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	"Liu, Jinsong" <jinsong.liu@...el.com>
Cc:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Register native mce handler as vMCE bounce back point

On Mon, Apr 16, 2012 at 01:07:35AM +0000, Liu, Jinsong wrote:
> >From 76e40a60878ff72986fd8d92611400195ae0f997 Mon Sep 17 00:00:00 2001
> From: Liu, Jinsong <jinsong.liu@...el.com>
> Date: Mon, 16 Apr 2012 00:16:58 +0800
> Subject: [PATCH 2/2] Register native mce handler as vMCE bounce back point
> 
> When xen hyeprvisor inject vMCE to guest, use native mce handler to handle it

hypervisor

> 
> Signed-off-by: Liu, Jinsong <jinsong.liu@...el.com>
> Signed-off-by: Ke, Liping <liping.ke@...el.com>
> Signed-off-by: Jiang, Yunhong <yunhong.jiang@...el.com>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> ---
>  arch/x86/xen/enlighten.c |   10 +++++++---
>  1 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 15628d4..346ba64 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -614,8 +614,8 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
>  	/*
>  	 * Look for known traps using IST, and substitute them
>  	 * appropriately.  The debugger ones are the only ones we care
> -	 * about.  Xen will handle faults like double_fault and
> -	 * machine_check, so we should never see them.  Warn if
> +	 * about.  Xen will handle faults like double_fault,
> +	 * so we should never see them.  Warn if
>  	 * there's an unexpected IST-using fault handler.
>  	 */
>  	if (addr == (unsigned long)debug)
> @@ -630,7 +630,11 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
>  		return 0;
>  #ifdef CONFIG_X86_MCE
>  	} else if (addr == (unsigned long)machine_check) {
> -		return 0;
> +		/*
> +		 * when xen hyeprvisor inject vMCE to guest,
> +		 * use native mce handler to handle it
> +		 */
> +		;


Can you just take the check out?


>  #endif
>  	} else {
>  		/* Some other trap using IST? */
> -- 
> 1.7.1


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