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Groups > linux.kernel > #1588532
| From | "Huang, Kai" <kai.huang@linux.intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration |
| Date | 2017-02-27 08:50 +0100 |
| Message-ID | <tfoee-2mQ-3@gated-at.bofh.it> (permalink) |
| References | (8 earlier) <tedNU-1Pt-21@gated-at.bofh.it> <tedNU-1Pt-3@gated-at.bofh.it> <tepP3-1Yk-3@gated-at.bofh.it> <tepP3-1Yk-1@gated-at.bofh.it> <tezEK-t9-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Herongguang (Stephen)" <herongguang.he@huawei.com> - 2017-02-24 03:30 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Herongguang (Stephen)" <herongguang.he@huawei.com> - 2017-02-24 10:40 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Greg KH <gregkh@linuxfoundation.org> - 2017-02-24 11:10 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Greg KH <gregkh@linuxfoundation.org> - 2017-02-24 11:10 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Paolo Bonzini <pbonzini@redhat.com> - 2017-02-24 11:10 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Paolo Bonzini <pbonzini@redhat.com> - 2017-02-24 16:20 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Herongguang (Stephen)" <herongguang.he@huawei.com> - 2017-02-25 02:50 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Huang, Kai" <kai.huang@linux.intel.com> - 2017-02-27 08:50 +0100
Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Chris Friesen <chris.friesen@windriver.com> - 2017-02-24 16:20 +0100
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