[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 30/34] 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-v3-its.c | 36 ++++++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c index c5dc797..f163c09 100644 --- a/xen/arch/arm/vgic-v3-its.c +++ b/xen/arch/arm/vgic-v3-its.c @@ -280,8 +280,8 @@ static bool write_itte_locked(struct virt_its *its, uint32_t devid, * This function takes care of the locking by taking the its_lock itself, so * a caller shall not hold this. Before returning, the lock is dropped again. */ -bool write_itte(struct virt_its *its, uint32_t devid, uint32_t evid, - uint32_t collid, uint32_t vlpi, struct vcpu **vcpu_ptr) +static bool write_itte(struct virt_its *its, uint32_t devid, uint32_t evid, + uint32_t collid, uint32_t vlpi, struct vcpu **vcpu_ptr) { bool ret; @@ -571,6 +571,35 @@ out_unlock: return ret; } +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 vcpu *vcpu; + uint32_t vlpi; + + if ( !read_itte(its, devid, eventid, &vcpu, &vlpi) ) + return -1; + + pirq = its->d->arch.vgic.handler->lpi_to_pending(its->d, vlpi); + if ( pirq ) + { + clear_bit(GIC_IRQ_GUEST_QUEUED, &pirq->status); + gic_remove_from_queues(vcpu, vlpi); + } + + if ( !write_itte(its, devid, eventid, UNMAPPED_COLLECTION, INVALID_LPI, + NULL) ) + return -1; + + if ( !gicv3_assign_guest_event(its->d, its->doorbell_address, + devid, eventid, NULL, 0) ) + return -1; + + return 0; +} + #define ITS_CMD_BUFFER_SIZE(baser) ((((baser) & 0xff) + 1) << 12) /* @@ -603,6 +632,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its) case GITS_CMD_CLEAR: ret = its_handle_clear(its, command); break; + case GITS_CMD_DISCARD: + ret = its_handle_discard(its, command); + break; case GITS_CMD_INT: ret = its_handle_int(its, command); break; -- 2.8.2 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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