Bug#604604: qemu-kvm: vm entry failed with error 0xffffffff; kvm_run returned -22

[Michael Tokarev <mjt@tls.msk.ru>]

28.11.2010 05:25, Ben Hutchings wrote:
> Please can you test whether this is fixed in 2.6.32-28?  We backported a
> KVM feature (VCPU_EVENTS) which meant we needed an additional fix beyond
> the one which Michael Tokarev identified, and that was done in -28.

Yes, with 2.6.32-28 686 kernel I can't reproduce the problem anymore,
kvm works as intended, while reverting back to -27 returns the issue.

Reading #599507 again, together with this #604604 and also #604900, it
looks like all this stuff is the same thing.  There's also #580652.

Out of curiocity, why this feature (VCPU_EVENTS) were backported/applied
in the first place (it was in 2.6.32-12)?  Isn't it somewhat too buggy
having in mind all the above?

Thank you!

/mjt