From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
To: bugzilla-daemon@bugzilla.kernel.org
Cc: kvm@vger.kernel.org
Subject: Re: [Bug 54061] guest panic after live migration
Date: Mon, 25 Feb 2013 16:26:17 +0800 [thread overview]
Message-ID: <512B2029.1090009@linux.vnet.ibm.com> (raw)
In-Reply-To: <20130220080616.A0DCA11FB82@bugzilla.kernel.org>
On 02/20/2013 04:06 PM, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=54061
>
>
>
>
>
> --- Comment #2 from Jay Ren <yongjie.ren@intel.com> 2013-02-20 08:06:16 ---
> Marcleo,
>
> yes, after reverting that commit "caf6900f2d8", live-migration can work fine.
>
Sorry for the wrong patch and the bug is: the fast page fault path
can make large-spte writeable without probably set dirty bitmap for
all small pages.
Two ways to fix these:
1): covert the large-spte to small sptes and wirte-protect them, then
no readonly large-spte exists.
2): only allow fast page fault to fix #PF on small spte.
Seems the first way is better because the second way can cause useless
page table waking.
next prev parent reply other threads:[~2013-02-25 8:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-19 3:05 [Bug 54061] New: guest panic after live migration bugzilla-daemon
2013-02-20 2:43 ` [Bug 54061] " bugzilla-daemon
2013-02-20 8:06 ` bugzilla-daemon
2013-02-25 8:26 ` Xiao Guangrong [this message]
2013-02-25 8:26 ` bugzilla-daemon
2013-03-01 7:33 ` bugzilla-daemon
2013-03-01 7:33 ` bugzilla-daemon
2013-03-01 7:34 ` bugzilla-daemon
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