[Xen-devel] [PATCH v5 0/6] vgic emulation and GICD_ITARGETSR

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Hi all,
this patch series improves vgic emulation in relation to GICD_ITARGETSR,
and implements irq delivery to vcpus other than vcpu0.

vgic_enable_irqs and vgic_disable_irqs currently ignore the itarget
settings and just enable/disable irqs on the current vcpu. Fix their
behaviour to enable/disable irqs on the vcpu set by itarget, that is
vcpu0 for irq >= 32 initially.

Introduce a new vgic function called vgic_get_target_vcpu to retrieve
the right target vcpu (looking at itargets) and use it from do_IRQ.

Change the physical irq affinity to make physical irqs follow virtual
cpus migration.



Changes in v5:
- add "rename vgic_irq_rank to vgic_rank_offset";
- add "introduce vgic_rank_irq";
- improve in-code comments;
- use vgic_rank_irq;
- use bit masks to write-ignore GICD_ITARGETSR;
- introduce an version of vgic_get_target_vcpu that doesn't take the
rank lock;
- keep the rank lock while enabling/disabling irqs;
- use find_first_bit instead of find_next_bit;
- pass unsigned long to find_next_bit for alignment on aarch64;
- call vgic_get_target_vcpu instead of gic_add_to_lr_pending to add the
irq in the right inflight queue;
- add barrier and bit tests to make sure that vgic_migrate_irq and
gic_update_one_lr can run simultaneously on different cpus without
issues;
- rework the loop to identify the new vcpu when ITARGETSR is written;
- use find_first_bit instead of find_next_bit;
- prettify vgic_move_irqs;
- rename vgic_move_irqs to arch_move_irqs;
- introduce helper function irq_set_affinity.



Stefano Stabellini (6):
      xen/arm: rename vgic_irq_rank to vgic_rank_offset
      xen/arm: introduce vgic_rank_irq
      xen/arm: observe itargets setting in vgic_enable_irqs and 
vgic_disable_irqs
      xen/arm: inflight irqs during migration
      xen/arm: support irq delivery to vcpu > 0
      xen/arm: physical irq follow virtual irq

 xen/arch/arm/gic.c           |   44 +++++++--
 xen/arch/arm/irq.c           |    3 +-
 xen/arch/arm/vgic.c          |  202 +++++++++++++++++++++++++++++++++++-------
 xen/common/event_channel.c   |    2 +
 xen/include/asm-arm/domain.h |    4 +
 xen/include/asm-arm/gic.h    |    4 +
 xen/include/asm-x86/irq.h    |    2 +
 7 files changed, 222 insertions(+), 39 deletions(-)

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