From: Glauber Costa <gcosta@redhat.com>
To: Avi Kivity <avi@qumranet.com>
Cc: kvm-devel <kvm-devel@lists.sourceforge.net>
Subject: Re: Stop the clock!
Date: Tue, 04 Mar 2008 09:41:33 -0300 [thread overview]
Message-ID: <47CD437D.3000406@redhat.com> (raw)
In-Reply-To: <47CD28DE.7020502@qumranet.com>
Avi Kivity wrote:
> With paravirt clocksource, reboot and kexec are broken: the clock keeps
> updating after the reboot, and the new kernel will have a random memory
> location trampled occasionally.
>
> So we need to stop the clock on kexec (in the guest) and reboot (in the
> host). On the host side, this can be done either in the kernel, or in
> userspace via new ioctls.
>
> Joerg, I think you mentioned you were working on a vm-wide reset
> ioctl()? If so, that would be the place to stop the clock on reboot.
>
> Glauber, can you extend the interface to support stopping the clock? It
> needs to be done even outside kexec, for example if the the user decides
> to stop using your clock.
>
Sure, I'll work on it.
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next prev parent reply other threads:[~2008-03-04 12:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-04 10:47 Stop the clock! Avi Kivity
2008-03-04 12:41 ` Glauber Costa [this message]
2008-03-04 15:49 ` Joerg Roedel
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