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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