Up to now the MAPD's ITT size field has been ignored. It encodes the number of eventid bit minus 1. It should be used to check the eventid when a MAPTI command is issued on a device. Let's store the number of eventid bits in the its_device and do the check on MAPTI. Also make sure the ITT size field does not exceed the GITS_TYPER IDBITS field. Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx> --- v4 -> v5: - its_cmd_get_size macro now returns the actual number of eventid bits - use GIC_ENCODE_SZ macro to encode ID_bits v3 -> v4: - VITS_TYPER_IDBITS set to 16 to be homogeneous with VITS_ESZ definition and correct users - nb_eventid_bits correspond to the actual number of eventid bits --- include/linux/irqchip/arm-gic-v3.h | 2 ++ virt/kvm/arm/vgic/vgic-its.c | 15 ++++++++++++++- 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h index 54c20bd..0c6798c 100644 --- a/include/linux/irqchip/arm-gic-v3.h +++ b/include/linux/irqchip/arm-gic-v3.h @@ -345,9 +345,11 @@ #define E_ITS_INT_UNMAPPED_INTERRUPT 0x010307 #define E_ITS_CLEAR_UNMAPPED_INTERRUPT 0x010507 #define E_ITS_MAPD_DEVICE_OOR 0x010801 +#define E_ITS_MAPD_ITTSIZE_OOR 0x010802 #define E_ITS_MAPC_PROCNUM_OOR 0x010902 #define E_ITS_MAPC_COLLECTION_OOR 0x010903 #define E_ITS_MAPTI_UNMAPPED_DEVICE 0x010a04 +#define E_ITS_MAPTI_ID_OOR 0x010a05 #define E_ITS_MAPTI_PHYSICALID_OOR 0x010a06 #define E_ITS_INV_UNMAPPED_INTERRUPT 0x010c07 #define E_ITS_INVALL_UNMAPPED_COLLECTION 0x010d09 diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 1b5797e..0f3c8f3 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -105,6 +105,7 @@ struct its_device { /* the head for the list of ITTEs */ struct list_head itt_head; + u32 nb_eventid_bits; u32 device_id; }; @@ -191,6 +192,8 @@ static struct its_ite *find_ite(struct vgic_its *its, u32 device_id, #define GIC_LPI_OFFSET 8192 +#define VITS_TYPER_IDBITS 16 + /* * Finds and returns a collection in the ITS collection table. * Must be called with the its_lock mutex held. @@ -391,7 +394,7 @@ static unsigned long vgic_mmio_read_its_typer(struct kvm *kvm, * DevBits low - as least for the time being. */ reg |= 0x0f << GITS_TYPER_DEVBITS_SHIFT; - reg |= 0x0f << GITS_TYPER_IDBITS_SHIFT; + reg |= GIC_ENCODE_SZ(VITS_TYPER_IDBITS, 5) << GITS_TYPER_IDBITS_SHIFT; reg |= GIC_ENCODE_SZ(abi->ite_esz, 4) << GITS_TYPER_ITT_ENTRY_SIZE_SHIFT; return extract_bytes(reg, addr & 7, len); @@ -562,6 +565,7 @@ static u64 its_cmd_mask_field(u64 *its_cmd, int word, int shift, int size) #define its_cmd_get_command(cmd) its_cmd_mask_field(cmd, 0, 0, 8) #define its_cmd_get_deviceid(cmd) its_cmd_mask_field(cmd, 0, 32, 32) +#define its_cmd_get_size(cmd) (its_cmd_mask_field(cmd, 1, 0, 5) + 1) #define its_cmd_get_id(cmd) its_cmd_mask_field(cmd, 1, 0, 32) #define its_cmd_get_physical_id(cmd) its_cmd_mask_field(cmd, 1, 32, 32) #define its_cmd_get_collection(cmd) its_cmd_mask_field(cmd, 2, 0, 16) @@ -752,6 +756,9 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its, if (!device) return E_ITS_MAPTI_UNMAPPED_DEVICE; + if (event_id >= BIT_ULL(device->nb_eventid_bits)) + return E_ITS_MAPTI_ID_OOR; + if (its_cmd_get_command(its_cmd) == GITS_CMD_MAPTI) lpi_nr = its_cmd_get_physical_id(its_cmd); else @@ -832,11 +839,15 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its, { u32 device_id = its_cmd_get_deviceid(its_cmd); bool valid = its_cmd_get_validbit(its_cmd); + u8 nb_eventid_bits = its_cmd_get_size(its_cmd); struct its_device *device; if (!vgic_its_check_id(its, its->baser_device_table, device_id)) return E_ITS_MAPD_DEVICE_OOR; + if (valid && nb_eventid_bits > VITS_TYPER_IDBITS) + return E_ITS_MAPD_ITTSIZE_OOR; + device = find_its_device(its, device_id); /* @@ -859,6 +870,8 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its, return -ENOMEM; device->device_id = device_id; + device->nb_eventid_bits = nb_eventid_bits; + INIT_LIST_HEAD(&device->itt_head); list_add_tail(&device->dev_list, &its->device_list); -- 2.5.5