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Subject[PATCH RFC 0/2] kvm: set irq affinity for assigned devices
To forward an interrupt to a vcpu that runs on
a host cpu different from the current one,
we need an ipi which likely will cost us as much
as delivering the interrupt directly to that cpu would.

So it seems to make sense to set irq affinity hint to point there, irq
balancer can then take this into accound and balance interrupts

This is what this patchset does.
Note: it might make sense to optimize the gsi lookups
here for the msi case, using rcu, the way we did for eventfd.
But that's a subject for another patch.

Warning: compiled only.

Any early comments / flames?



Michael S. Tsirkin (2):
kvm: pass host irq number to set irq calls
kvm: set affinity hint for assigned device msi

arch/x86/kvm/i8254.c | 4 ++--
arch/x86/kvm/lapic.c | 2 +-
arch/x86/kvm/x86.c | 2 +-
include/linux/kvm_host.h | 7 ++++---
virt/kvm/assigned-dev.c | 17 ++++++++++-------
virt/kvm/eventfd.c | 7 ++++---
virt/kvm/ioapic.c | 2 +-
virt/kvm/ioapic.h | 2 +-
virt/kvm/irq_comm.c | 35 +++++++++++++++++++++++++++--------
9 files changed, 51 insertions(+), 27 deletions(-)

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