linux-kernel - Re: [patch, 2.6.22-rc6] fix nmi

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Date:	Mon, 25 Jun 2007 14:45:12 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang

On 2007.06.25 10:26:52 +0200, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > the winner is ...
> > 
> >  f8822f42019eceed19cc6c0f985a489e17796ed8 is first bad commit
> >  commit f8822f42019eceed19cc6c0f985a489e17796ed8
> >  Author: Jeremy Fitzhardinge <jeremy@...p.org>
> >  Date:   Wed May 2 19:27:14 2007 +0200
> > 
> >     [PATCH] i386: PARAVIRT: Consistently wrap paravirt ops callsites to make them patchable
> 
> and of course i'm happy to test any patch that is simpler than the 
> brutal revert i sent.

wrmsrl() looks broken, dropping the upper 32bits of the value to be
written. Does this help?

Björn
---
diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
index d7a0512..7f846a7 100644
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -539,7 +539,7 @@ static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
 	val = paravirt_read_msr(msr, &_err);	\
 } while(0)
 
-#define wrmsrl(msr,val)		((void)paravirt_write_msr(msr, val, 0))
+#define wrmsrl(msr,val)		wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
 #define wrmsr_safe(msr,a,b)	paravirt_write_msr(msr, a, b)
 
 /* rdmsr with exception handling */
-
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