5 files changed, 39 insertions, 12 deletions

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 06fc71746e..7c5ef81b55 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1682,9 +1682,9 @@ void vhost_dev_cleanup(struct vhost_dev *hdev)
     memset(hdev, 0, sizeof(struct vhost_dev));
 }
 
-static void vhost_dev_disable_notifiers_nvqs(struct vhost_dev *hdev,
-                                             VirtIODevice *vdev,
-                                             unsigned int nvqs)
+void vhost_dev_disable_notifiers_nvqs(struct vhost_dev *hdev,
+                                      VirtIODevice *vdev,
+                                      unsigned int nvqs)
 {
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
     int i, r;
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index 6e9d8293da..c3ffd8328d 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -1247,9 +1247,21 @@ static bool virtio_crypto_guest_notifier_pending(VirtIODevice *vdev, int idx)
 static struct vhost_dev *virtio_crypto_get_vhost(VirtIODevice *vdev)
 {
     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
-    CryptoDevBackend *b = vcrypto->cryptodev;
-    CryptoDevBackendClient *cc = b->conf.peers.ccs[0];
-    CryptoDevBackendVhost *vhost_crypto = cryptodev_get_vhost(cc, b, 0);
+    CryptoDevBackend *b;
+    CryptoDevBackendClient *cc;
+    CryptoDevBackendVhost *vhost_crypto;
+
+    b = vcrypto->cryptodev;
+    if (!b) {
+        return NULL;
+    }
+
+    cc = b->conf.peers.ccs[0];
+    vhost_crypto = cryptodev_get_vhost(cc, b, 0);
+    if (!vhost_crypto) {
+        return NULL;
+    }
+
     return &vhost_crypto->dev;
 }
 
diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index ef64bf1b4a..4075f3d4ce 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -88,6 +88,7 @@ static uint32_t virtio_mem_default_thp_size(void)
 static uint32_t thp_size;
 
 #define HPAGE_PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size"
+#define HPAGE_PATH "/sys/kernel/mm/transparent_hugepage/"
 static uint32_t virtio_mem_thp_size(void)
 {
     gchar *content = NULL;
@@ -98,6 +99,12 @@ static uint32_t virtio_mem_thp_size(void)
         return thp_size;
     }
 
+    /* No THP -> no restrictions. */
+    if (!g_file_test(HPAGE_PATH, G_FILE_TEST_EXISTS)) {
+        thp_size = VIRTIO_MEM_MIN_BLOCK_SIZE;
+        return thp_size;
+    }
+
     /*
      * Try to probe the actual THP size, fallback to (sane but eventually
      * incorrect) default sizes.
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 524b63e5c7..4d832fe845 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -615,8 +615,12 @@ static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy,
         reg = &proxy->regs[i];
         if (*off >= reg->offset &&
             *off + len <= reg->offset + reg->size) {
-            *off -= reg->offset;
-            return &reg->mr;
+            MemoryRegionSection mrs = memory_region_find(&reg->mr,
+                                        *off - reg->offset, len);
+            assert(mrs.mr);
+            *off = mrs.offset_within_region;
+            memory_region_unref(mrs.mr);
+            return mrs.mr;
         }
     }
 
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 9e10cbc058..a26f18908e 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2331,8 +2331,12 @@ void virtio_reset(void *opaque)
         vdev->device_endian = virtio_default_endian();
     }
 
-    if (vdev->vhost_started && k->get_vhost) {
-        vhost_reset_device(k->get_vhost(vdev));
+    if (k->get_vhost) {
+        struct vhost_dev *hdev = k->get_vhost(vdev);
+        /* Only reset when vhost back-end is connected */
+        if (hdev && hdev->vhost_ops) {
+            vhost_reset_device(hdev);
+        }
     }
 
     if (k->reset) {
@@ -3665,7 +3669,7 @@ static void virtio_queue_packed_update_used_idx(VirtIODevice *vdev, int n)
     return;
 }
 
-static void virtio_split_packed_update_used_idx(VirtIODevice *vdev, int n)
+static void virtio_queue_split_update_used_idx(VirtIODevice *vdev, int n)
 {
     RCU_READ_LOCK_GUARD();
     if (vdev->vq[n].vring.desc) {
@@ -3678,7 +3682,7 @@ void virtio_queue_update_used_idx(VirtIODevice *vdev, int n)
     if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
         return virtio_queue_packed_update_used_idx(vdev, n);
     } else {
-        return virtio_split_packed_update_used_idx(vdev, n);
+        return virtio_queue_split_update_used_idx(vdev, n);
     }
 }