[PATCH-4.5 v2 0/10] remove maintenance interrupts

[Stefano Stabellini <stefano.stabellini@eu.citrix.com>]

Hi all,
this patch series removes any needs for maintenance interrupts for both
hardware and software interrupts in Xen.
It achieves the goal by using the GICH_LR_HW bit for hardware interrupts
and by checking the status of the GICH_LR registers on return to guest,
clearing the registers that are invalid and handling the lifecycle of
the corresponding interrupts in Xen data structures.


Changes in v2:
- do not assume physical IRQ == virtual IRQ;
- refactor gic_set_lr;
- simplify gic_clear_lrs;
- disable/enable the GICH_HCR_UIE bit in GICH_HCR;
- only enable GICH_HCR_UIE if this_cpu(lr_mask) == ((1 << nr_lrs) - 1);
- add a patch to keep track of the LR number in pending_irq;
- add a patch to set GICH_LR_PENDING to inject a second irq while the
first one is still active;
- add a patch to simplify and reduce the usage of gic.lock;
- add a patch to reduce the usage of vgic.lock;
- add a patch to use GICH_ELSR[01] to avoid reading all the GICH_LRs in
gic_clear_lrs;
- add a debug patch to print more info in gic_dump_info.


Stefano Stabellini (10):
      xen/arm: remove unused virtual parameter from vgic_vcpu_inject_irq
      xen/arm: support HW interrupts in gic_set_lr
      xen/arm: do not request maintenance_interrupts
      xen/arm: set GICH_HCR_NPIE if all the LRs are in use
      xen/arm: keep track of the GICH_LR used for the irq in struct pending_irq
      xen/arm: second irq injection while the first irq is still inflight
      xen/arm: don't protect GICH and lr_queue accesses with gic.lock
      xen/arm: avoid taking unconditionally the vgic.lock in gic_clear_lrs
      xen/arm: use GICH_ELSR[01] to avoid reading all the GICH_LRs in gic_clear_lrs
      xen/arm: print more info in gic_dump_info, keep gic_lr sync'ed

 xen/arch/arm/domain.c        |    2 +-
 xen/arch/arm/gic.c           |  216 +++++++++++++++++++++++++++++--------------------------
 xen/arch/arm/irq.c           |    2 +-
 xen/arch/arm/time.c          |    2 +-
 xen/arch/arm/vgic.c          |   34 ++++++---
 xen/arch/arm/vtimer.c        |    4 +-
 xen/include/asm-arm/domain.h |    1 +
 xen/include/asm-arm/gic.h    |    4 +-
 8 files changed, 151 insertions(+), 114 deletions(-)


git://xenbits.xen.org/people/sstabellini/xen-unstable.git no_maintenance_interrupts-v2