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    SubjectRe: [patch] KVM: T60 resume fix
    Ingo Molnar wrote:
    > * Avi Kivity <> 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

    Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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      Last update: 2007-03-05 09:53    [W:0.031 / U:30.700 seconds]
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