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. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
