From: Andi Kleen <ak@suse.de>
To: virtualization@lists.osdl.org
Subject: Re: [RFC, PATCH 17/24] i386 Vmi msr patch
Date: Wed, 22 Mar 2006 21:21:32 +0100
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Cc: Zachary Amsden <zach@vmware.com>, Linus Torvalds <torvalds@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Xen-devel <xen-devel@lists.xensource.com>,
       Andrew Morton <akpm@osdl.org>, Dan Hecht <dhecht@vmware.com>,
       Dan Arai <arai@vmware.com>, Anne Holler <anne@vmware.com>,
       Pratap Subrahmanyam <pratap@vmware.com>,
       Christopher Li <chrisl@vmware.com>, Joshua LeVasseur <jtl@ira.uka.de>,
       Chris Wright <chrisw@osdl.org>, Rik Van Riel <riel@redhat.com>,
       Jyothy Reddy <jreddy@vmware.com>, Jack Lo <jlo@vmware.com>,
       Kip Macy <kmacy@fsmware.com>, Jan Beulich <jbeulich@novell.com>,
       Ky Srinivasan <ksrinivasan@novell.com>,
       Wim Coekaerts <wim.coekaerts@oracle.com>,
       Leendert van Doorn <leendert@watson.ibm.com>
References: <200603131812.k2DICGJE005747@zach-dev.vmware.com>
In-Reply-To: <200603131812.k2DICGJE005747@zach-dev.vmware.com>
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> -#define rdtsc(low,high) \
> -     __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
> -
> -#define rdtscl(low) \
> -     __asm__ __volatile__("rdtsc" : "=a" (low) : : "edx")
> -
> -#define rdtscll(val) \
> -     __asm__ __volatile__("rdtsc" : "=A" (val))
> -
> -#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
> -
> -#define rdpmc(counter,low,high) \
> -     __asm__ __volatile__("rdpmc" \
> -			  : "=a" (low), "=d" (high) \
> -			  : "c" (counter))

The kernel doesn't use rdpmc. And moving rdtsc is useless
as I wrote earlier.

But mostly it is used from user space and you will break everything there.

-Andi
-
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