4.14-stable review patch. If anyone has any objections, please let me know.
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From: Andre Przywara andre.przywara@arm.com
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@vger.kernel.org # 4.12+ Reported-by: Jan Glauber jan.glauber@caviumnetworks.com Signed-off-by: Andre Przywara andre.przywara@arm.com Acked-by: Christoffer Dall christoffer.dall@arm.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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;