Hi Paul, On 15.09.2016 10:09, Paul Mackerras wrote: > This takes out the code that arranges to run two (or more) virtual > cores on a single subcore when possible, that is, when both vcores > are from the same VM, the VM is configured with one CPU thread per > virtual core, and all the per-subcore registers have the same value > in each vcore. Since the VTB (virtual timebase) is a per-subcore > register, and will almost always differ between vcores, this code > is disabled on POWER8 machines, meaning that it is only usable on > POWER7 machines (which don't have VTB). Given the tiny number of > POWER7 machines which have firmware that allows them to run HV KVM, > the benefit of simplifying the code outweighs the loss of this > feature on POWER7 machines. > > Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx> > --- > arch/powerpc/kvm/book3s_hv.c | 128 +------------------------------------------ > 1 file changed, 3 insertions(+), 125 deletions(-) I've built a kernel with your patches and used it for my test where on of the guests normally generates a soft lockup within some few hours. The test now ran on two P8 machines over the weekend, and there was no single soft lockup anymore, all guests survived now - that's great! Tested-by: Thomas Huth <thuth@xxxxxxxxxx> -- 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
