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

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Message-ID: <DE8DF0795D48FD4CA783C40EC829233514BFD4@SHSMSX101.ccr.corp.intel.com>
Date:	Tue, 17 Apr 2012 12:55:49 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.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

Konrad Rzeszutek Wilk wrote:
> 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?

What do you mean by 'check out'? remove
else if (addr == (unsigned long) machine_check) {
	;
}
?

That would fail to register mce bounce back point.

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

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