Re: [Qemu-devel] [RFC 0/8] arm AioContext with its own timer stuff

[Alex Bligh]

--On 26 July 2013 10:43:45 +0200 Stefan Hajnoczi <address@hidden> wrote:

> block.c and block/qed.c use vm_clock because block drivers should not do
> guest I/O while the vm is stopped.  This is especially true during live
> migration where it's important to hand off the image file from the
> source host to the destination host with good cache consistency.  The
> source host is not allowed to modify the image file anymore once the
> destination host has resumed the guest.
>
> Block jobs use rt_clock because they aren't considered guest I/O.

That's going to be 'interesting' if qemu-img uses a block driver that
uses a timer, as I don't think the vm timer is running when qemu-img
is running.

--
Alex Bligh