Re: [libvirt] pvpanic plans?
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Il 31/10/2013 15:32, Eric Blake ha scritto:
On 10/31/2013 08:30 AM, Michael S. Tsirkin wrote:
> On Thu, Oct 24, 2013 at 10:39:03AM +0800, Hu Tao wrote:
>> Hi All,
>>
>> I know it's been a long time since this thread. But qemu 1.7 is
>> releasing, do you have any consensus on this?
>
> I think the biggest issue is the new PANICKED state. Guests
> already have simple ways to halt the CPU, and actually do. I
> think a new state was a mistake. So how about the following?
> Does it break anything? (Untested).
Don't you still need to halt the guest on a panic event, for
management to have a chance to choose what to do about the panic?
I'm suspecting this patch does break things.
Yes, it does. But I think that, once we make the pvpanic device is
optional, to a large extent there is no bug. Adding the pvpanic
device to the VM will make libvirt obey <oncrash> instead of the
in-guest setting, and that's it.
Two months have passed and no casualties have been reported due to
pvpanic. Let's just remove the auto-pvpanic from all machine types in
1.7 (yes, that's backwards incompatible in a strict sense), document
it in the release notes, and hope that the old QEMU versions with
mandatory pvpanic die of old age.
All the advantages/disadvantages from my original messages still
apply. Let's ignore the disadvantages and just KISS.
Paolo
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.22 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/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=GBBt
-----END PGP SIGNATURE-----