[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC PATCH v2 21/26] ARM: vITS: handle DISCARD command
The DISCARD command drops the connection between a DeviceID/EventID and an LPI/collection pair. We mark the respective structure entries as not allocated and make sure that any queued IRQs are removed. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> --- xen/arch/arm/vgic-its.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/xen/arch/arm/vgic-its.c b/xen/arch/arm/vgic-its.c index 7c80c17..52c660a 100644 --- a/xen/arch/arm/vgic-its.c +++ b/xen/arch/arm/vgic-its.c @@ -351,6 +351,44 @@ out_unlock: return 0; } +static int its_handle_discard(struct virt_its *its, uint64_t *cmdptr) +{ + uint32_t devid = its_cmd_get_deviceid(cmdptr); + uint32_t eventid = its_cmd_get_id(cmdptr); + struct pending_irq *pirq; + struct vits_itte *itte; + struct vcpu *vcpu; + + spin_lock(&its->its_lock); + itte = get_devid_evid(its, devid, eventid); + if ( !itte ) + goto out_unlock; + + vcpu = get_vcpu_from_collection(its, itte->collection); + + pirq = lpi_to_pending(vcpu, itte->vlpi, false); + if ( pirq ) + { + clear_bit(GIC_IRQ_GUEST_QUEUED, &pirq->status); + gic_remove_from_queues(vcpu, itte->vlpi); + + /* Mark this pending IRQ struct as availabe again. */ + if ( !test_bit(GIC_IRQ_GUEST_VISIBLE, &pirq->status) ) + pirq->irq = 0; + } + + itte->vlpi = 0; /* Mark this ITTE as unused. */ + itte->collection = ~0; + gicv3_assign_guest_event(its->d, devid, eventid, NULL, 0); + + put_devid_evid(its, itte); + +out_unlock: + spin_unlock(&its->its_lock); + + return 0; +} + #define ITS_CMD_BUFFER_SIZE(baser) ((((baser) & 0xff) + 1) << 12) static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its, @@ -374,6 +412,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its, case GITS_CMD_CLEAR: its_handle_clear(its, cmdptr); break; + case GITS_CMD_DISCARD: + its_handle_discard(its, cmdptr); + break; case GITS_CMD_INT: its_handle_int(its, cmdptr); break; -- 2.9.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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