[PATCH 0/2] kvm: disable virtualization on kdump

Eric W. Biederman ebiederm at xmission.com
Mon Oct 27 11:02:31 EDT 2008

Avi Kivity <avi at redhat.com> writes:

> Eric W. Biederman wrote:
> We've observed on some machines that keyboard controller reset didn't work, and
> that the fallback to triple-fault asserted INIT and not RESET (and that this
> INIT was blocked, hanging the machine).  Switching to acpi reset worked on some
> machines, but not all.  Either acpi reset was not implemented on the failing
> machines, or it was wired to INIT and not RESET.

Right.  INIT does not reset things like the MTRRs, I had forgotten
that distinction.

Frequently the firmware when it regains control at 0xffffffff0
asserts reset, but if we can't get there.  Ouch!

> Since we already have NMI IPIs, we could disable vmx there.  If it is done
> unconditionally and without notifiers, there is no chance of having unreviewed
> surprises sneaking in.

Sounds good to me.


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