Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1587458
| From | "Herongguang (Stephen)" <herongguang.he@huawei.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration |
| Date | 2017-02-24 10:40 +0100 |
| Message-ID | <tekw2-6Db-3@gated-at.bofh.it> (permalink) |
| References | (5 earlier) <tedNU-1Pt-15@gated-at.bofh.it> <tedNU-1Pt-17@gated-at.bofh.it> <tedNU-1Pt-19@gated-at.bofh.it> <tedNU-1Pt-21@gated-at.bofh.it> <tedNU-1Pt-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 2017/2/24 10:23, Herongguang (Stephen) wrote:
>
>
> On 2017/2/22 22:43, Paolo Bonzini wrote:
>>
>>
>> On 22/02/2017 14:31, Chris Friesen wrote:
>>>>>
>>>>
>>>> Can you reproduce it with kernel 4.8+? I'm suspecting commmit
>>>> 4e59516a12a6 ("kvm: vmx: ensure VMCS is current while enabling PML",
>>>> 2016-07-14) to be the fix.
>>>
>>> I can't easily try with a newer kernel, the software package we're using
>>> has kernel patches that would have to be ported.
>>>
>>> I'm at a conference, don't really have time to set up a pair of test
>>> machines from scratch with a custom kernel.
>>
>> 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.
Hi, Greg, can you cherry pick commit 4e59516a12a6ef6dcb660cb3a3f70c64bd60cfec to 4.4-y?
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
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
csiph-web