4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andre Przywara <andre.przywara@xxxxxxx>
commit 711702b57cc3c50b84bd648de0f1ca0a378805be upstream.
kvm_read_guest() will eventually look up in kvm_memslots(), which requires
either to hold the kvm->slots_lock or to be inside a kvm->srcu critical
section.
In contrast to x86 and s390 we don't take the SRCU lock on every guest
exit, so we have to do it individually for each kvm_read_guest() call.
Use the newly introduced wrapper for that.
Cc: Stable <stable@xxxxxxxxxxxxxxx> # 4.12+
Reported-by: Jan Glauber <jan.glauber@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Acked-by: Christoffer Dall <christoffer.dall@xxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
virt/kvm/arm/vgic/vgic-its.c | 4 ++--
virt/kvm/arm/vgic/vgic-v3.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1830,7 +1830,7 @@ static int scan_its_table(struct vgic_it
int next_offset;
size_t byte_offset;
- ret = kvm_read_guest(kvm, gpa, entry, esz);
+ ret = kvm_read_guest_lock(kvm, gpa, entry, esz);
if (ret)
return ret;
@@ -2191,7 +2191,7 @@ static int vgic_its_restore_cte(struct v
int ret;
BUG_ON(esz > sizeof(val));
- ret = kvm_read_guest(kvm, gpa, &val, esz);
+ ret = kvm_read_guest_lock(kvm, gpa, &val, esz);
if (ret)
return ret;
val = le64_to_cpu(val);
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -297,7 +297,7 @@ retry:
bit_nr = irq->intid % BITS_PER_BYTE;
ptr = pendbase + byte_offset;
- ret = kvm_read_guest(kvm, ptr, &val, 1);
+ ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
if (ret)
return ret;
@@ -350,7 +350,7 @@ int vgic_v3_save_pending_tables(struct k
ptr = pendbase + byte_offset;
if (byte_offset != last_byte_offset) {
- ret = kvm_read_guest(kvm, ptr, &val, 1);
+ ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
if (ret)
return ret;
last_byte_offset = byte_offset;
