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Date: Mon, 13 Mar 2017 22:58:42 +0800 From: fangying <fangying1@...wei.com> To: "Huang, Kai" <kai.huang@...ux.intel.com>, "Herongguang (Stephen)" <herongguang.he@...wei.com>, Paolo Bonzini <pbonzini@...hat.com>, "Chris Friesen" <chris.friesen@...driver.com>, "Han, Huaitong" <huaitong.han@...el.com>, "hangaohuai@...wei.com" <hangaohuai@...wei.com>, <stable@...r.kernel.org> CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "xudong.hao@...ux.intel.com" <xudong.hao@...ux.intel.com>, "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>, "wangxinxin.wang@...wei.com" <wangxinxin.wang@...wei.com>, "rkrcmar@...hat.com" <rkrcmar@...hat.com>, "guangrong.xiao@...ux.intel.com" <guangrong.xiao@...ux.intel.com>, <linux-kernel@...r.kernel.org> Subject: Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Hi, Huang Kai After weeks of intensive testing, we think the problem is solved and this issue can be closed. On 2017/2/27 15:38, Huang, Kai wrote: > > > On 2/25/2017 2:44 PM, Herongguang (Stephen) wrote: >> >> >> On 2017/2/24 23:14, Paolo Bonzini wrote: >>> >>> >>> On 24/02/2017 16:10, Chris Friesen wrote: >>>> On 02/23/2017 08:23 PM, Herongguang (Stephen) wrote: >>>> >>>>> On 2017/2/22 22:43, Paolo Bonzini wrote: >>>> >>>>>> Hopefully Gaohuai and Rongguang can help with this too. >>>>>> >>>>>> Paolo >>>>> >>>>> Yes, we are looking into and testing this. >>>>> >>>>> I think this can result in any memory corruption, if VM1 writes its >>>>> PML buffer into VM2’s VMCS (since sched_in/sched_out notifier of VM1 >>>>> is not registered yet), then VM1 is destroyed (hence its PML buffer >>>>> is freed back to kernel), after that, VM2 starts migration, so CPU >>>>> logs VM2’s dirty GFNS into a freed memory, results in any memory >>>>> corruption. >>>>> >>>>> As its severity, this commit >>>>> (http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4e59516a12a6ef6dcb660cb3a3f70c64bd60cfec) >>>>> >>>>> >>>>> >>>>> is eligible to back port to kernel stable. >>>> >>>> Are we expecting that fix to resolve the original issue, or is it a >>>> separate issue that needs fixing in stable? >>> >>> It should be the original issue. >>> >>> Paolo >>> >>> . >>> >> Yes, I agree, though we are still testing. >> >> > Hi Stephen, > > Sorry for late reply. I was taking the whole week off last week. How's > the test going? > > Thanks, > -Kai > > . >
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