On Wed, Aug 01, 2012 at 01:29:11PM +0200, Stefan Bader wrote: > I have been looking at a report[1] about the kvm_intel module failing to load on > linux v3.3 and newer guests when running on a v3.2 host. Bisection turned up the > following patch: > > commit fee84b079d5ddee2247b5c1f53162c330c622902 > Author: Avi Kivity <avi@xxxxxxxxxx> > Date: Thu Nov 10 14:57:25 2011 +0200 > > KVM: VMX: Intercept RDPMC > > Intercept RDPMC and forward it to the PMU emulation code. > > Signed-off-by: Avi Kivity <avi@xxxxxxxxxx> > Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx> > Signed-off-by: Avi Kivity <avi@xxxxxxxxxx> > > It looks like requiring the feature based on cpu fails when the host (outer kvm > module) code does not support it. So maybe that should be optional instead of > required? According to Intel SDM there was never CPU that didn't support RDPMC exiting. Looks like unfortunate nested VMX bug. > Seems also like kvm_amd does not "suffer" from any test that could fail and > should be ok (though I did not test it personally). > > -Stefan > > [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1031090 > -- 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
