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KVM: arm/arm64: vgic-its: Check GITS_BASER Valid bit before saving tables

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At the moment we don't properly check the GITS_BASER<n>.Valid
bit before saving the collection and device tables.

On vgic_its_save_collection_table() we use the GITS_BASER gpa
field whereas the Valid bit should be used.

On vgic_its_save_device_tables() there is no check. This can
cause various bugs, among which a subsequent fault when accessing
the table in guest memory.

Let's systematically check the Valid bit before doing anything.

We also uniformize the code between save and restore.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2017-10-26 17:23:06 +02:00 committed by Christoffer Dall
parent c9b51bb60d
commit c2385eaa6c
1 changed files with 11 additions and 9 deletions
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20
virt/kvm/arm/vgic/vgic-its.c
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@ -2067,11 +2067,12 @@ static int vgic_its_device_cmp(void *priv, struct list_head *a,
static int vgic_its_save_device_tables(struct vgic_its *its)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
u64 baser = its->baser_device_table;
struct its_device *dev;
int dte_esz = abi->dte_esz;
u64 baser;
baser = its->baser_device_table;
if (!(baser & GITS_BASER_VALID))
return 0;
list_sort(NULL, &its->device_list, vgic_its_device_cmp);
@ -2215,17 +2216,17 @@ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
static int vgic_its_save_collection_table(struct vgic_its *its)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
u64 baser = its->baser_coll_table;
gpa_t gpa = BASER_ADDRESS(baser);
struct its_collection *collection;
u64 val;
gpa_t gpa;
size_t max_size, filled = 0;
int ret, cte_esz = abi->cte_esz;
gpa = BASER_ADDRESS(its->baser_coll_table);
if (!gpa)
if (!(baser & GITS_BASER_VALID))
return 0;
max_size = GITS_BASER_NR_PAGES(its->baser_coll_table) * SZ_64K;
max_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
list_for_each_entry(collection, &its->collection_list, coll_list) {
ret = vgic_its_save_cte(its, collection, gpa, cte_esz);
@ -2256,17 +2257,18 @@ static int vgic_its_save_collection_table(struct vgic_its *its)
static int vgic_its_restore_collection_table(struct vgic_its *its)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
u64 baser = its->baser_coll_table;
int cte_esz = abi->cte_esz;
size_t max_size, read = 0;
gpa_t gpa;
int ret;
if (!(its->baser_coll_table & GITS_BASER_VALID))
if (!(baser & GITS_BASER_VALID))
return 0;
gpa = BASER_ADDRESS(its->baser_coll_table);
gpa = BASER_ADDRESS(baser);
max_size = GITS_BASER_NR_PAGES(its->baser_coll_table) * SZ_64K;
max_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
while (read < max_size) {
ret = vgic_its_restore_cte(its, gpa, cte_esz);