• [PATCH] PCI MSI: allow alignment restrictions on vector allocation

    From Thomas Gleixner@21:1/5 to Thomas Gleixner on Mon Oct 2 22:50:06 2017
    On Mon, 2 Oct 2017, Thomas Gleixner wrote:
    On Mon, 2 Oct 2017, Daniel Drake wrote:
    2) The affinity setting of straight MSI interrupts (w/o remapping) on x86
    requires to make the affinity change from the interrupt context of the
    current active vector in order not to lose interrupts or worst case
    getting into a stale state.

    That works for single vectors, but trying to move all vectors in one
    go is more or less impossible, as there is no reliable way to
    determine that none of the other vectors is on flight.

    There might be some 'workarounds' for that, but I rather avoid that
    unless we get an official documented one from Intel/AMD.

    Thinking more about it. That might be actually a non issue for MSI, but we
    have that modus operandi in the current code and we need to address that
    first before even thinking about multi MSI support.

    Thanks,

    tglx

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