[Xen-devel] [PATCH v4 0/8] ARM: VGIC/GIC separation cleanups

[Andre Przywara <andre.przywara@xxxxxxx>]

Hi,

an updated version, focussing on the complaints Julien raised about the
locking on assigned hardware IRQs. Patch 5/8 has been changed to address
his concerns.
I dropped the tag on this patch, also on 2/8 since I moved the per-CPU
variable declaration into gic.h, as requested.  Not sure if that is what
people wanted, so please have a look.
The rest of that patch is unchanged, and I checked that the code is still
correct even after the rebase to staging.

Please test and apply.

Cheers,
Andre

Changelov v3->v4
01: added tags
02: remove extra header files, move per-CPU variable into gic.h
03, 04: unchanged
05: rework locking, rework dropping hardware IRQ connection
06: add ASSERT
07: unchanged
08: removed read_mostly attribute

Changelog v2->v3:
01: reworked
02: rebased to match staging, added tag
03, 07: added tag
08: new, as suggested by Julien

================
By the original VGIC design, Xen differentiates between the actual VGIC
emulation on one hand and the GIC hardware accesses on the other.
It seems there were some deviations from that scheme (over time?), so at
the moment we end up happily accessing VGIC specific data structures
like struct pending_irq and struct vgic_irq_rank from pure GIC files
like gic.c or even irq.c (try: git grep -l struct\ pending_irq xen/arch/arm).
But any future VGIC rework will depend on a clean separation, so this
series tries to clean this up.
After this series there are no more references to VGIC structures from
GIC files, at least for non-ITS code. The ITS is a beast own its own
(blame the author) and will be addressed later.

Andre Przywara (8):
  ARM: VGIC: drop unneeded gic_restore_pending_irqs()
  ARM: VGIC: split gic.c to observe hardware/virtual GIC separation
  ARM: VGIC: split up gic_dump_info() to cover virtual part separately
  ARM: VGIC: rework events_need_delivery()
  ARM: VGIC: factor out vgic_connect_hw_irq()
  ARM: VGIC: factor out vgic_get_hw_irq_desc()
  ARM: VGIC: rework gicv[23]_update_lr to not use pending_irq
  ARM: make nr_irqs a constant

 xen/arch/arm/Makefile       |   1 +
 xen/arch/arm/domain.c       |   1 +
 xen/arch/arm/gic-v2.c       |  14 +-
 xen/arch/arm/gic-v3.c       |  12 +-
 xen/arch/arm/gic-vgic.c     | 461 ++++++++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/gic.c          | 423 ++--------------------------------------
 xen/arch/arm/irq.c          |   9 +-
 xen/arch/arm/vgic.c         |  11 ++
 xen/include/asm-arm/event.h |  13 +-
 xen/include/asm-arm/gic.h   |   8 +-
 xen/include/asm-arm/irq.h   |   5 +-
 xen/include/asm-arm/vgic.h  |   6 +
 12 files changed, 521 insertions(+), 443 deletions(-)
 create mode 100644 xen/arch/arm/gic-vgic.c

-- 
2.14.1


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