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SubjectRe: [PATCH] Fix emergency_restart (sysrq-b) with kvm loaded on Intel hosts
Eric W. Biederman wrote:
> Ingo Molnar <> writes:
>> * Avi Kivity <> wrote:
>>> Enabling Intel VT has the curious side effect whereby the INIT signal
>>> is blocked. Rather than comment on the wisdom of this side effect,
>>> this patch adds an emergency restart reboot notifier, and modifies the
>>> kvm reboot notifier to disable VT on emergency reboot.
> Please no notifiers in emergency_restart.
> First emergency_restart is not supposed to work reliably it is a best effort tickle
> the hardware thing.
> Second and more importantly whenever someone adds a notifier instead of a proper hook
> to one a code path like this it seems like avoiding building a proper interface so
> and I believe keeps us from getting all of the logic and the heuristics right.
> Why not just add a disable intel_vt if it is enabled call?

We need to do it across all cpus.

However, a reliable (and simpler) fix has emerged: reset via ACPI. That
causes a true reset which VT does not block.

error compiling committee.c: too many arguments to function

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