@@ -874,6 +874,30 @@ struct pending_irq *gicv3_assign_guest_event(struct domain *d,
return pirq;
}
+/* Changes the target VCPU for a given host LPI assigned to a domain. */
+int gicv3_lpi_change_vcpu(struct domain *d, paddr_t vdoorbell,
+ uint32_t vdevid, uint32_t veventid,
+ unsigned int vcpu_id)
+{
+ uint32_t host_lpi;
+ struct its_device *dev;
+
+ spin_lock(&d->arch.vgic.its_devices_lock);
+ dev = get_its_device(d, vdoorbell, vdevid);
+ if ( dev )
+ host_lpi = get_host_lpi(dev, veventid);
+ else
+ host_lpi = 0;
+ spin_unlock(&d->arch.vgic.its_devices_lock);
+
+ if ( !host_lpi )
+ return -ENOENT;
+
+ gicv3_lpi_update_host_vcpuid(host_lpi, vcpu_id);
+
+ return 0;
+}
+
/* Scan the DT for any ITS nodes and create a list of host ITSes out of it. */
void gicv3_its_dt_init(const struct dt_device_node *node)
{
@@ -220,6 +220,21 @@ void gicv3_lpi_update_host_entry(uint32_t host_lpi, int domain_id,
write_u64_atomic(&hlpip->data, hlpi.data);
}
+int gicv3_lpi_update_host_vcpuid(uint32_t host_lpi, unsigned int vcpu_id)
+{
+ union host_lpi *hlpip;
+
+ ASSERT(host_lpi >= LPI_OFFSET);
+
+ host_lpi -= LPI_OFFSET;
+
+ hlpip = &lpi_data.host_lpis[host_lpi / HOST_LPIS_PER_PAGE][host_lpi % HOST_LPIS_PER_PAGE];
+
+ write_u16_atomic(&hlpip->vcpu_id, vcpu_id);
+
+ return 0;
+}
+
static int gicv3_lpi_allocate_pendtable(uint64_t *reg)
{
uint64_t val;
@@ -530,6 +530,47 @@ static int its_handle_mapti(struct virt_its *its, uint64_t *cmdptr)
return 0;
}
+static int its_handle_movi(struct virt_its *its, uint64_t *cmdptr)
+{
+ uint32_t devid = its_cmd_get_deviceid(cmdptr);
+ uint32_t eventid = its_cmd_get_id(cmdptr);
+ int collid = its_cmd_get_collection(cmdptr);
+ struct pending_irq *p;
+ struct vcpu *vcpu;
+ uint32_t vlpi;
+ int ret = -1;
+
+ spin_lock(&its->its_lock);
+ /* Check for a mapped LPI and get the LPI number. */
+ if ( !read_itte_locked(its, devid, eventid, &vcpu, &vlpi) )
+ goto out_unlock;
+
+ /* Check the new collection ID and get the new VCPU pointer */
+ vcpu = get_vcpu_from_collection(its, collid);
+ if ( !vcpu )
+ goto out_unlock;
+
+ /* Update our cached vcpu_id in the pending_irq. */
+ p = its->d->arch.vgic.handler->lpi_to_pending(its->d, vlpi);
+ p->lpi_vcpu_id = vcpu->vcpu_id;
+
+ /* Now store the new collection in the translation table. */
+ if ( !write_itte_locked(its, devid, eventid, collid, vlpi, &vcpu) )
+ goto out_unlock;
+
+ spin_unlock(&its->its_lock);
+
+ /* TODO: lookup currently-in-guest virtual IRQs and migrate them? */
+
+ return gicv3_lpi_change_vcpu(its->d, its->doorbell_address,
+ devid, eventid, vcpu->vcpu_id);
+
+out_unlock:
+ spin_unlock(&its->its_lock);
+
+ return ret;
+}
+
#define ITS_CMD_BUFFER_SIZE(baser) ((((baser) & 0xff) + 1) << 12)
/*
@@ -575,6 +616,12 @@ static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its)
case GITS_CMD_MAPTI:
ret = its_handle_mapti(its, command);
break;
+ case GITS_CMD_MOVALL:
+ gdprintk(XENLOG_G_INFO, "ITS: ignoring MOVALL command\n");
+ break;
+ case GITS_CMD_MOVI:
+ ret = its_handle_movi(its, command);
+ break;
case GITS_CMD_SYNC:
/* We handle ITS commands synchronously, so we ignore SYNC. */
break;
@@ -172,8 +172,12 @@ void gicv3_free_host_lpi_block(uint32_t first_lpi);
struct pending_irq *gicv3_assign_guest_event(struct domain *d, paddr_t doorbell,
uint32_t devid, uint32_t eventid,
struct vcpu *v, uint32_t virt_lpi);
+int gicv3_lpi_change_vcpu(struct domain *d, paddr_t doorbell,
+ uint32_t devid, uint32_t eventid,
+ unsigned int vcpu_id);
void gicv3_lpi_update_host_entry(uint32_t host_lpi, int domain_id,
unsigned int vcpu_id, uint32_t virt_lpi);
+int gicv3_lpi_update_host_vcpuid(uint32_t host_lpi, unsigned int vcpu_id);
#else
The MOVI command moves the interrupt affinity from one redistributor (read: VCPU) to another. For now migration of "live" LPIs is not yet implemented, but we store the changed affinity in the host LPI structure and in our virtual ITTE. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- xen/arch/arm/gic-v3-its.c | 24 ++++++++++++++++++++ xen/arch/arm/gic-v3-lpi.c | 15 +++++++++++++ xen/arch/arm/vgic-v3-its.c | 47 ++++++++++++++++++++++++++++++++++++++++ xen/include/asm-arm/gic_v3_its.h | 4 ++++ 4 files changed, 90 insertions(+)