[PATCH v6 0/8] Handle forwarded level-triggered interrupts

Christoffer Dall
2017-12-04T20:02:01Z

From: Christoffer Dall <christoffer.dall@linaro.org>

This series is an alternative approach to Eric Auger's direct EOI setup
patches [1] in terms of the KVM VGIC support.

The idea is to maintain existing semantics for the VGIC for mapped
level-triggered IRQs and also support the timer using mapped IRQs with
the same VGIC support as VFIO interrupts.

Based on v4.15-rc.

Also available at:
git://git.kernel.org/pub/scm/linux/kernel/git/cdall/linux.git level-mapped-v6

Changes since v5:
- Rebased on v4.15-rc1
- Changed comment on preemption code as suggested by Andre
- Fixed white space and confusing conditionals as suggested by Drew

Changes since v4:
- Rebased on the timer optimization series merged in the v4.15 merge
window, which caused a fair amount of modifications to patch 3.
- Added a static key to disable the sync operations when no VMs are
using userspace irqchips to further optimize the performance
- Fixed extra semicolon in vgic-mmio.c
- Added commentary as requested during review
- Dropped what was patch 4, because it was merged as part of GICv4
support.
- Factored out the VGIC input level function change as separate patch
(helps bisect and debugging), before providing a function for the
timer.

Changes since v3:
- Added a number of patches and moved patches around a bit.
- Check for uaccesses in the mmio handler functions
- Fixed bugs in the mmio handler functions

Changes since v2:
- Removed patch 5 from v2 and integrating the changes in what's now
patch 5 to make it easier to reuse code when adding VFIO integration.
- Changed the virtual distributor MMIO handling to use the
pending_latch and more closely match the semantics of SPENDR and
CPENDR for both level and edge mapped interrupts.

Changes since v1:
- Added necessary changes to the timer (Patch 1)
- Added handling of guest MMIO accesses to the virtual distributor
(Patch 4)
- Addressed Marc's comments from the initial RFC (mostly renames)

Thanks,
-Christoffer

Christoffer Dall (8):
KVM: arm/arm64: Remove redundant preemptible checks
KVM: arm/arm64: Factor out functionality to get vgic mmio
requester_vcpu
KVM: arm/arm64: Don't cache the timer IRQ level
KVM: arm/arm64: vgic: Support level-triggered mapped interrupts
KVM: arm/arm64: Support a vgic interrupt line level sample function
KVM: arm/arm64: Support VGIC dist pend/active changes for mapped IRQs
KVM: arm/arm64: Provide a get_input_level for the arch timer
KVM: arm/arm64: Avoid work when userspace iqchips are not used

include/kvm/arm_arch_timer.h | 2 +
include/kvm/arm_vgic.h | 13 ++++-
virt/kvm/arm/arch_timer.c | 105 +++++++++++++++++++++-----------------
virt/kvm/arm/arm.c | 2 -
virt/kvm/arm/vgic/vgic-mmio.c | 115 ++++++++++++++++++++++++++++++++++--------
virt/kvm/arm/vgic/vgic-v2.c | 29 +++++++++++
virt/kvm/arm/vgic/vgic-v3.c | 29 +++++++++++
virt/kvm/arm/vgic/vgic.c | 42 +++++++++++++--
virt/kvm/arm/vgic/vgic.h | 8 +++
9 files changed, 270 insertions(+), 75 deletions(-)

--
2.14.2