On Fri, Jan 25, 2013 at 02:37:16PM +0100, Olaf Hering wrote: > Enable hyperv_clocksource only if its advertised as a feature. > XenServer 6 returns the signature which is checked in > ms_hyperv_platform(), but it does not offer all features. Currently the > clocksource is enabled unconditionally in ms_hyperv_init_platform(), and > the result is a hanging guest. > > Hyper-V spec Bit 1 indicates the availability of Partition Reference > Counter. Register the clocksource only if this bit is set. > > The guest in question prints this in dmesg: > [ 0.000000] Hypervisor detected: Microsoft HyperV > [ 0.000000] HyperV: features 0x70, hints 0x0 > > This bug can be reproduced easily be setting 'viridian=1' in a HVM domU > .cfg file. A workaround without this patch is to boot the HVM guest with > 'clocksource=jiffies'. > > Signed-off-by: Olaf Hering <[email protected]> > Cc: [email protected] > Cc: KY Srinivasan <[email protected]> > Cc: Greg KH <[email protected]> > --- > arch/x86/kernel/cpu/mshyperv.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-)
This needs to go through the x86 maintainers, not me, sorry. greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
