Ingo Molnar wrote:
While the change mentions that it fixes a time warp bug, it also says
it should be rare. So clearly kvm smp tsc handing is buggy.
Ingo/Thomas, (or anybody else), do you have any insight as to what kvm
can be doing wrong to trigger this behavior?
hm. Those time warps were really small, due to the small imperfections
in the "sync up all CPUs to the same moment and do a WRMSR to clear all
their TSCs" mechanism. I.e. at most a few usec time warps. I really dont
know how that should result in udevd hanging. Can you debug udevd in any
way?
Adding debug didn't help. I'll try some sysrq keys to see what the
guest thinks is happening.
so the only thing that KVM might be doing incorrectly here is the
emulation of the WRMSR that clears the TSC of each vcpu?
By inspection, it is correct. Of course I may be missing something, so
I'll write a unit test for it. It should also be much slower than the
native wrmsr.
--
error compiling committee.c: too many arguments to function
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