Ingo Molnar wrote:
* Avi Kivity <[EMAIL PROTECTED]> wrote:
my T60 laptop does not resume correctly due to KVM attempting to
send an IPI to a CPU that might be down (or not up yet). (Doing so
also triggers the send_IPI_mask_bitmask() warning in
arch/i386/kernel/smp.c, line 732.)
with this fix applied my laptop does not hang during resume.
[ KVM will have to disable/enable virtualization on the CPU itself
that goes down / comes up, not via an IPI sent from the requesting
CPU. ]
That is already CPU_ONLINE in my tree (and in the pull request sent to
Linus a couple of days ago).
that solves the resume problem - but doesnt solve the CPU_DEAD issue of
sending an IPI to an already offline CPU. Might be a better idea to do
it in CPU_DOWN_PREPARE? (and then to also add a CPU_DOWN_FAILED branch?)
Mainline now has DOWN_PREPARE and UP_CANCELED calling
->hardware_disable(), and ONLINE calling ->hardware_enabled(). What
tree are you looking at?
[but I do see the need for DOWN_FAILED now. Off to find a resumable
machine...]
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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