From: Kunkun Jiang <jiangkunkun@xxxxxxxxxx>
commit e9649129d33dca561305fc590a7c4ba8c3e5675a upstream.
vgic_its_save_device_tables will traverse its->device_list to
save DTE for each device. vgic_its_restore_device_tables will
traverse each entry of device table and check if it is valid.
Restore if valid.
But when MAPD unmaps a device, it does not invalidate the
corresponding DTE. In the scenario of continuous saves
and restores, there may be a situation where a device's DTE
is not saved but is restored. This is unreasonable and may
cause restore to fail. This patch clears the corresponding
DTE when MAPD unmaps a device.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 57a9a117154c ("KVM: arm64: vgic-its: Device table save/restore")
Co-developed-by: Shusen Li <lishusen2@xxxxxxxxxx>
Signed-off-by: Shusen Li <lishusen2@xxxxxxxxxx>
Signed-off-by: Kunkun Jiang <jiangkunkun@xxxxxxxxxx>
[Jing: Update with entry write helper]
Signed-off-by: Jing Zhang <jingzhangos@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241107214137.428439-5-jingzhangos@xxxxxxxxxx
Signed-off-by: Oliver Upton <oliver.upton@xxxxxxxxx>
---
arch/arm64/kvm/vgic/vgic-its.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
index 84499545bd8d..7a1569b9d10e 100644
--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -1211,9 +1211,11 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its,
bool valid = its_cmd_get_validbit(its_cmd);
u8 num_eventid_bits = its_cmd_get_size(its_cmd);
gpa_t itt_addr = its_cmd_get_ittaddr(its_cmd);
+ int dte_esz = vgic_its_get_abi(its)->dte_esz;
struct its_device *device;
+ gpa_t gpa;
- if (!vgic_its_check_id(its, its->baser_device_table, device_id, NULL))
+ if (!vgic_its_check_id(its, its->baser_device_table, device_id, &gpa))
return E_ITS_MAPD_DEVICE_OOR;
if (valid && num_eventid_bits > VITS_TYPER_IDBITS)
@@ -1234,7 +1236,7 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its,
* is an error, so we are done in any case.
*/
if (!valid)
- return 0;
+ return vgic_its_write_entry_lock(its, gpa, 0, dte_esz);
device = vgic_its_alloc_device(its, device_id, itt_addr,
num_eventid_bits);
--
2.47.0.338.g60cca15819-goog
