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Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it? |
Date: |
Mon, 17 Sep 2012 12:08:28 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0 |
On 09/17/2012 11:56 AM, Luiz Capitulino wrote:
> Hi Wen,
>
> We've re-reviewed the dump-guest-memory command and found some
> possible issues with the -p option.
>
> However, I also think that we should consider if having the -p
> feature is really worth it. It's a complex feature and has a number
> of limitations*. If libvirt doesn't use this, dropping it shouldn't
> be a big deal (we can return an error when -p is used).
>
> * The issues discussed in this email plus the fact that the guest
> memory may be corrupted, and the guest may be in real-mode even
> when paging is enabled
Libvirt is not currently exposing the -p mode (that is, it currently
blindly passes 'paging':false to the JSON command). Dropping it would
have no noticeable impact to libvirt. (Note - libvirt _did_ wire up an
internal flag to qemu_monitor_json.c, QEMU_MONITOR_DUMP_PAGING, but
nothing sets this flag, so libvirt would need a cleanup patch to remove
it as useless code, but that is not user-visible.)
--
Eric Blake address@hidden +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Luiz Capitulino, 2012/09/17
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?,
Eric Blake <=
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Wen Congyang, 2012/09/17
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Jan Kiszka, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Markus Armbruster, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Jan Kiszka, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Luiz Capitulino, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Jan Kiszka, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Markus Armbruster, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Anthony Liguori, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Luiz Capitulino, 2012/09/18
- Re: [Qemu-devel] qmp: dump-guest-memory: -p option has issues, fix it or drop it?, Anthony Liguori, 2012/09/18