From: Anthony Liguori <anthony@codemonkey.ws>
To: "Yang, Sheng" <sheng.yang@intel.com>
Cc: kvm@vger.kernel.org, Glauber Costa <gcosta@redhat.com>,
glommer@gmail.com, avi@qumranet.com
Subject: Re: [PATCH] mask out clflush
Date: Thu, 10 Jul 2008 08:30:14 -0500 [thread overview]
Message-ID: <48760EE6.1070303@codemonkey.ws> (raw)
In-Reply-To: <200807101843.57902.sheng.yang@intel.com>
Yang, Sheng wrote:
> On Wednesday 09 July 2008 02:29:44 Glauber Costa wrote:
>
>> clflush is a non-privileged instruction that flushes the cacheline
>> given by its parameter, in terms of linear address. As it is
>> non-privileged, it is quite tricky, because a guest doing clflush
>> will actually be trying to flush a host kernel address.
>>
>
> The linear address was convert to host physical address, then cache
> line was flushed. Of course the host physical address was used by
> guest at the time. I don't understand why we need to prevent guest
> from flushing cache line related to itself...
>
The problem turned out to be that we aren't emulating clflush in
x86_emulate.
Regards,
Anthony Liguori
> --
> Thanks
> Yang, Sheng
> --
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>
next prev parent reply other threads:[~2008-07-10 13:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-08 18:29 [PATCH] mask out clflush Glauber Costa
2008-07-08 19:34 ` Anthony Liguori
2008-07-08 20:01 ` Glauber Costa
2008-07-10 10:43 ` Yang, Sheng
2008-07-10 13:30 ` Anthony Liguori [this message]
2008-07-10 13:34 ` Avi Kivity
2008-07-10 13:37 ` Anthony Liguori
2008-07-10 14:10 ` Avi Kivity
2008-07-10 14:20 ` Anthony Liguori
2008-07-10 14:45 ` Glauber Costa
2008-07-10 14:47 ` Avi Kivity
2008-07-10 15:37 ` Anthony Liguori
2008-07-10 15:39 ` Avi Kivity
2008-07-10 20:18 ` Glauber Costa
2008-07-13 7:58 ` Avi Kivity
2008-07-10 14:16 ` Avi Kivity
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