From: Avi Kivity <avi@redhat.com>
To: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Marcelo Tosatti <mtosatti@redhat.com>,
Sheng Yang <sheng@linux.intel.com>,
KVM list <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] KVM MMU: thinking of shadow page cache
Date: Thu, 01 Apr 2010 12:12:05 +0300 [thread overview]
Message-ID: <4BB46365.7020400@redhat.com> (raw)
In-Reply-To: <4BB461E7.9000109@cn.fujitsu.com>
On 04/01/2010 12:05 PM, Xiao Guangrong wrote:
>
>> We've considered this in the past, it makes sense. The big question is
>> whether any guests actually map the same page table through PDEs with
>> different permissions (mapping the same page table through multiple PDEs
>> is very common, but always with the same permissions). Do you know of
>> any such guest?
>>
> I also don't know whether have such guest.
> Maybe my idea is no good for current OS, thanks for your comments.
>
In fact there are plans to make kvm such a guest (when running in nested
mode) - when we perform live migration we write-protect all guest pages,
and it's reasonable to use the top-level shadow page to write protect
all memory at once instead of iterating over all mmu pages. When that
goes in, we should also implement your idea.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2010-04-01 16:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-30 1:59 [RFC] KVM MMU: thinking of shadow page cache Xiao Guangrong
2010-03-30 13:32 ` Avi Kivity
2010-04-01 9:05 ` Xiao Guangrong
2010-04-01 9:12 ` Avi Kivity [this message]
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