Messages in this thread | | | Date | Fri, 25 Jan 2013 08:10:16 -0800 | From | Greg KH <> | Subject | Re: [PATCH] x86: Hyper-V: register clocksource only if its advertised |
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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 <olaf@aepfle.de> > Cc: stable@kernel.org > Cc: KY Srinivasan <kys@microsoft.com> > Cc: Greg KH <gregkh@linuxfoundation.org> > --- > 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
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