Re: [Xen-devel] [PATCH v11 08/34] ARM: GIC: Add checks for NULL pointer pending_irq's

[Julien Grall <julien.grall@xxxxxxx>]

Hi Andre,

On 09/06/17 18:41, Andre Przywara wrote:
> For LPIs the struct pending_irq's are dynamically allocated and the
> pointers will be stored in a radix tree. Since an LPI can be "unmapped"
> at any time, teach the VGIC how to deal with irq_to_pending() returning
> a NULL pointer.
> We just do nothing in this case or clean up the LR if the virtual LPI
> number was still in an LR.
>
> Those are all call sites for irq_to_pending(), as per:
> "git grep irq_to_pending", and their evaluations:
> (PROTECTED means: added NULL check and bailing out)
>
>     xen/arch/arm/gic.c:
> gic_route_irq_to_guest(): only called for SPIs, added ASSERT()
> gic_remove_irq_from_guest(): only called for SPIs, added ASSERT()
> gic_remove_from_lr_pending(): PROTECTED, called within VCPU VGIC lock
> gic_raise_inflight_irq(): PROTECTED, called under VCPU VGIC lock
> gic_raise_guest_irq(): PROTECTED, called under VCPU VGIC lock
> gic_update_one_lr(): PROTECTED, called under VCPU VGIC lock
>
>     xen/arch/arm/vgic.c:
> vgic_migrate_irq(): not called for LPIs (virtual IRQs), added ASSERT()
> arch_move_irqs(): not iterating over LPIs, LPI ASSERT already in place
> vgic_disable_irqs(): not called for LPIs, added ASSERT()
> vgic_enable_irqs(): not called for LPIs, added ASSERT()
> vgic_vcpu_inject_irq(): PROTECTED, moved under VCPU VGIC lock
>
>     xen/include/asm-arm/event.h:
> local_events_need_delivery_nomask(): only called for a PPI, added ASSERT()
>
>     xen/include/asm-arm/vgic.h:
> (prototype)
>
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

--
Julien Grall

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