[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 16/27] ARM: vITS: handle CLEAR command
This introduces the ITS command handler for the CLEAR command, which clears the pending state of an LPI. This removes a not-yet injected, but already queued IRQ from a VCPU. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> --- xen/arch/arm/vgic-v3-its.c | 35 +++++++++++++++++++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c index 267a573..e808f43 100644 --- a/xen/arch/arm/vgic-v3-its.c +++ b/xen/arch/arm/vgic-v3-its.c @@ -131,8 +131,8 @@ static void put_devid_evid(struct virt_its *its, struct vits_itte *itte) * protect the ITTs with their less-than-page-size granularity. * Takes and drops the its_lock. */ -bool read_itte(struct virt_its *its, uint32_t devid, uint32_t evid, - struct vcpu **vcpu, uint32_t *vlpi) +static bool read_itte(struct virt_its *its, uint32_t devid, uint32_t evid, + struct vcpu **vcpu, uint32_t *vlpi) { struct vits_itte *itte; int collid; @@ -216,6 +216,34 @@ static uint64_t its_cmd_mask_field(uint64_t *its_cmd, #define its_cmd_get_target_addr(cmd) its_cmd_mask_field(cmd, 2, 16, 32) #define its_cmd_get_validbit(cmd) its_cmd_mask_field(cmd, 2, 63, 1) +static int its_handle_clear(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; + + /* Remove a pending, but not yet injected guest IRQ. */ + pirq = lpi_to_pending(vcpu, vlpi, false); + if ( pirq ) + { + clear_bit(GIC_IRQ_GUEST_QUEUED, &pirq->status); + gic_remove_from_queues(vcpu, vlpi); + + /* Mark this pending IRQ struct as availabe again. */ + if ( !test_bit(GIC_IRQ_GUEST_VISIBLE, &pirq->status) ) + pirq->irq = 0; + } + + clear_bit(vlpi - LPI_OFFSET, vcpu->arch.vgic.pendtable); + + 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, @@ -236,6 +264,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its, cmdptr = its->cmdbuf + (its->creadr / sizeof(*its->cmdbuf)); switch (its_cmd_get_command(cmdptr)) { + case GITS_CMD_CLEAR: + its_handle_clear(its, cmdptr); + break; case GITS_CMD_SYNC: /* We handle ITS commands synchronously, so we ignore SYNC. */ break; -- 2.9.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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