From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@qumranet.com>
Cc: Glauber Costa <glommer@gmail.com>,
"Yang, Sheng" <sheng.yang@intel.com>,
kvm@vger.kernel.org, Glauber Costa <gcosta@redhat.com>
Subject: Re: [PATCH] mask out clflush
Date: Thu, 10 Jul 2008 10:37:09 -0500 [thread overview]
Message-ID: <48762CA5.50809@codemonkey.ws> (raw)
In-Reply-To: <4876211A.5030307@qumranet.com>
Avi Kivity wrote:
> Glauber Costa wrote:
>> On Thu, Jul 10, 2008 at 11:20 AM, Anthony Liguori
>> <anthony@codemonkey.ws> wrote:
>>
>>> Avi Kivity wrote:
>>>
>>>> Anthony Liguori wrote:
>>>>
>>>>> It's equivalent to a read from a VT perspective so if the read would
>>>>> trap, the clflush instruction will trap.
>>>>>
>>>>>
>>>> Reads don't normally go through the emulator. Is the guest
>>>> clflush()ing
>>>> mmio addresses? Strange as these are not normally cached.
>>>>
>>> It seems so, Glauber mentioned that the address was an MMIO address.
>>>
>>
>> yes. It is address 0xc8821000, apparently part of a pci controller
>> initialization.
>>
>
> qemu pci starts at 0xe0000000 IIRC. So maybe the guest is flushing
> random addresses just to be annoying.
That's a virtual address, not a physical address IIUC.
Regards,
Anthony Liguori
next prev parent reply other threads:[~2008-07-10 15:37 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
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 [this message]
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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