On Wed, Feb 29, 2012 at 12:48:57PM +0200, Avi Kivity wrote:
> On 02/29/2012 12:44 PM, Gleb Natapov wrote:
> > > > >
> > > > Yes, crash can be so severe that it is not even detected by a kernel
> > > > itself, so not OOPS message even printed. But in most cases if kernel is
> > > > functional enough to print OOPS it is functional enough to call single
> > > > hypercall instruction.
> > >
> > > Why not print the oops to virtio-serial? Or even just a regular serial
> > > port? That's what bare metal does.
> > >
> > The more interface is complex the more chances it will fail during
> > panic. Regular serial is likely more reliable than virtio-serial.
> > Hypercall is likely more reliable than uart. On serial user can
> > fake panic notification.
>
> The serial device is under control of the kernel, so the user can only
> access it if the kernel so allows.
>
Yes, but if we will hijack UART for panic notification VM user will not
be able to use it for anything else. virtio-serial have many channels,
but AFAIK it does not work at early stages of boot process.
--
Gleb.
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