[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 32/34] ARM: vITS: handle INVALL command
The INVALL command instructs an ITS to invalidate the configuration data for all LPIs associated with a given redistributor (read: VCPU). This is nasty to emulate exactly with our architecture, so we just iterate over all mapped LPIs and filter for those from that particular VCPU. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> --- xen/arch/arm/vgic-v3-its.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c index 7634a63..19b00c2 100644 --- a/xen/arch/arm/vgic-v3-its.c +++ b/xen/arch/arm/vgic-v3-its.c @@ -462,6 +462,65 @@ static int its_handle_inv(struct virt_its *its, uint64_t *cmdptr) return 0; } +/* + * INVALL updates the per-LPI configuration status for every LPI mapped to + * a particular redistributor. + * We iterate over all mapped LPIs in our radix tree and update those. + */ +static int its_handle_invall(struct virt_its *its, uint64_t *cmdptr) +{ + uint32_t collid = its_cmd_get_collection(cmdptr); + struct vcpu *vcpu; + struct pending_irq *pirqs[16]; + uint64_t vlpi = 0; /* 64-bit to catch overflows */ + unsigned int nr_lpis, i; + int ret = 0; + + /* + * As this implementation walks over all mapped LPIs, it might take + * too long for a real guest, so we might want to revisit this + * implementation for DomUs. + * However this command is very rare, also we don't expect many + * LPIs to be actually mapped, so it's fine for Dom0 to use. + */ + ASSERT(is_hardware_domain(its->d)); + + spin_lock(&its->its_lock); + vcpu = get_vcpu_from_collection(its, collid); + spin_unlock(&its->its_lock); + + read_lock(&its->d->arch.vgic.pend_lpi_tree_lock); + + do + { + nr_lpis = radix_tree_gang_lookup(&its->d->arch.vgic.pend_lpi_tree, + (void **)pirqs, vlpi, + ARRAY_SIZE(pirqs)); + + for ( i = 0; i < nr_lpis; i++ ) + { + /* We only care about LPIs on our VCPU. */ + if ( pirqs[i]->lpi_vcpu_id != vcpu->vcpu_id ) + continue; + + vlpi = pirqs[i]->irq; + /* If that fails for a single LPI, carry on to handle the rest. */ + if ( update_lpi_enabled_status(its->d, vcpu, vlpi) ) + ret = -1; + } + /* + * Loop over the next gang of pending_irqs until we reached the end of + * a (fully populated) tree or the lookup function returns less LPIs than + * it has been asked for. + */ + } while ( (++vlpi < its->d->arch.vgic.nr_lpis) && + (nr_lpis == ARRAY_SIZE(pirqs)) ); + + read_unlock(&its->d->arch.vgic.pend_lpi_tree_lock); + + return ret; +} + static int its_handle_mapc(struct virt_its *its, uint64_t *cmdptr) { uint32_t collid = its_cmd_get_collection(cmdptr); @@ -705,6 +764,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its) case GITS_CMD_INV: ret = its_handle_inv(its, command); break; + case GITS_CMD_INVALL: + ret = its_handle_invall(its, command); + break; case GITS_CMD_MAPC: ret = its_handle_mapc(its, command); break; -- 2.8.2 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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