From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Avi Kivity <avi@qumranet.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
kvm-devel@lists.sourceforge.net, akpm@osdl.org,
linux-kernel@vger.kernel.org
Subject: Re: [kvm-devel] [PATCH] KVM: Avoid using vmx instruction directly
Date: Thu, 09 Nov 2006 15:39:04 -0800 [thread overview]
Message-ID: <4553BC18.6090207@goop.org> (raw)
In-Reply-To: <455340B8.2080206@qumranet.com>
Avi Kivity wrote:
>> Or gcc
>> might move the assignment of phys_addr to after the inline assembly.
>>
> "asm volatile" prevents that (and I'm not 100% sure it's necessary).
No, it won't necessarily. "asm volatile" simply forces gcc to emit the
assembler, even if it thinks its output doesn't get used. It makes no
ordering guarantees with respect to other code (or even other "asm
volatiles"). The "memory" clobbers should fix the ordering of the asms
though.
J
next prev parent reply other threads:[~2006-11-09 23:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-09 11:08 [PATCH] KVM: Avoid using vmx instruction directly Avi Kivity
2006-11-09 13:29 ` [kvm-devel] " Arnd Bergmann
2006-11-09 13:36 ` Avi Kivity
2006-11-09 14:42 ` Arnd Bergmann
2006-11-09 14:52 ` Avi Kivity
2006-11-09 16:37 ` Arnd Bergmann
2006-11-09 16:51 ` Avi Kivity
2006-11-09 23:39 ` Jeremy Fitzhardinge [this message]
2006-11-10 12:46 ` Martin Schwidefsky
2006-11-10 19:38 ` Jeremy Fitzhardinge
2006-11-21 18:35 ` H. Peter Anvin
2006-11-21 19:41 ` Avi Kivity
2006-11-21 20:50 ` Jeremy Fitzhardinge
2006-11-22 6:42 ` Avi Kivity
2006-11-22 9:10 ` Jeremy Fitzhardinge
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