[PATCH v4 0/3] KVM: s390: Improve floating IRQ injection behavior

[Janosch Frank <frankja@linux.ibm.com>]

Multiple fixes for the floating IRQ handling triggered by the firq
kvm-unit-test sometimes failing for pv vms.

Only waking up cpus which are enabled, re-kicking after the
instruction notification for pv cpus and a general redistribution of
IRQs on entry (pending guidance from performance measurements).

The floating part of floating IRQs can make it difficult to make
absolutely sure that an IRQ is actually delivered, especially if the
OS doesn't regularly have the masks open. We might miss mask
enablements if the intervention bits don't get set properly and the
kicks might end up nowhere.

v4:
 - Replaced pv check with mask check which does not need locks
 - Fixed bitnum to bitmask translations that Sashiko rightfully
   complained about
v3:
 - Separated code into two patches
 - Added a patch that fixes service injections for PV vms
 - Added IRQ filtering and kick all if no cpu is enabled
 - Fixed the IO pend type translation
v2:
 - Rebase onto master
 - Added IRQ type check before delivering


Janosch Frank (3):
  KVM: s390: Improve floating IRQ injection behavior
  KVM: s390: Kick PV cpus at the right time for service irqs
  KVM: s390: Add opportunistic floating IRQ injection

 arch/s390/include/asm/kvm_host.h |   1 +
 arch/s390/kvm/intercept.c        |   9 ++
 arch/s390/kvm/interrupt.c        | 153 ++++++++++++++++++++++++++-----
 arch/s390/kvm/kvm-s390.c         |   3 +
 arch/s390/kvm/kvm-s390.h         |   2 +
 5 files changed, 147 insertions(+), 21 deletions(-)

-- 
2.53.0