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KVM: arm64: vgic-its: Interpret MAPD Size field and check related errors

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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@redhat.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Eric Auger 2016-12-22 18:14:14 +01:00 committed by Christoffer Dall
parent ab01c6bdac
commit 0d44cdb631
2 changed files with 16 additions and 1 deletions
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2
include/linux/irqchip/arm-gic-v3.h
View File

@ -347,9 +347,11 @@
#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

15
virt/kvm/arm/vgic/vgic-its.c
View File

@ -103,6 +103,7 @@ struct its_device {
/* the head for the list of ITTEs */
struct list_head itt_head;
u32 num_eventid_bits;
u32 device_id;
};
@ -224,6 +225,8 @@ 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.
@ -424,7 +427,7 @@ 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);
@ -595,6 +598,7 @@ 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)
@ -785,6 +789,9 @@ 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->num_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
@ -865,11 +872,15 @@ 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 num_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 && num_eventid_bits > VITS_TYPER_IDBITS)
return E_ITS_MAPD_ITTSIZE_OOR;
device = find_its_device(its, device_id);
/*
@ -892,6 +903,8 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its,
return -ENOMEM;
device->device_id = device_id;
device->num_eventid_bits = num_eventid_bits;
INIT_LIST_HEAD(&device->itt_head);
list_add_tail(&device->dev_list, &its->device_list);