From: Marcelo Tosatti <mtosatti@redhat.com>
To: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Avi Kivity <avi.kivity@gmail.com>, Gleb Natapov <gleb@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH v3] KVM: MMU: lazily drop large spte
Date: Wed, 6 Feb 2013 22:28:16 -0200 [thread overview]
Message-ID: <20130207002816.GA16685@amt.cnet> (raw)
In-Reply-To: <5110B08D.9080600@linux.vnet.ibm.com>
On Tue, Feb 05, 2013 at 03:11:09PM +0800, Xiao Guangrong wrote:
> Currently, kvm zaps the large spte if write-protected is needed, the later
> read can fault on that spte. Actually, we can make the large spte readonly
> instead of making them un-present, the page fault caused by read access can
> be avoid
>
> The idea is from Avi:
> | As I mentioned before, write-protecting a large spte is a good idea,
> | since it moves some work from protect-time to fault-time, so it reduces
> | jitter. This removes the need for the return value.
>
> Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Applied, thanks.
prev parent reply other threads:[~2013-02-07 0:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-05 7:11 [PATCH v3] KVM: MMU: lazily drop large spte Xiao Guangrong
2013-02-05 9:05 ` Gleb Natapov
2013-02-07 0:28 ` Marcelo Tosatti [this message]
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