Merge tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging

pci,pc,virtio: features, tests, fixes, cleanups

lots of acpi rework
first version of biosbits infrastructure
ASID support in vhost-vdpa
core_count2 support in smbios
PCIe DOE emulation
virtio vq reset
HMAT support
part of infrastructure for viommu support in vhost-vdpa
VTD PASID support
fixes, tests all over the place

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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* tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu: (83 commits)
  checkpatch: better pattern for inline comments
  hw/virtio: introduce virtio_device_should_start
  tests/acpi: update tables for new core count test
  bios-tables-test: add test for number of cores > 255
  tests/acpi: allow changes for core_count2 test
  bios-tables-test: teach test to use smbios 3.0 tables
  hw/smbios: add core_count2 to smbios table type 4
  vhost-user: Support vhost_dev_start
  vhost: Change the sequence of device start
  intel-iommu: PASID support
  intel-iommu: convert VTD_PE_GET_FPD_ERR() to be a function
  intel-iommu: drop VTDBus
  intel-iommu: don't warn guest errors when getting rid2pasid entry
  vfio: move implement of vfio_get_xlat_addr() to memory.c
  tests: virt: Update expected *.acpihmatvirt tables
  tests: acpi: aarch64/virt: add a test for hmat nodes with no initiators
  hw/arm/virt: Enable HMAT on arm virt machine
  tests: Add HMAT AArch64/virt empty table files
  tests: acpi: q35: update expected blobs *.hmat-noinitiators expected HMAT:
  tests: acpi: q35: add test for hmat nodes without initiators
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 84 insertions, 6 deletions

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index d28f8b9..feda448 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -34,6 +34,7 @@
 #include "standard-headers/linux/virtio_ring.h"
 #include "hw/virtio/vhost.h"
 #include "hw/virtio/virtio-bus.h"
+#include "linux-headers/linux/vhost.h"
 
 
 /* Features supported by host kernel. */
@@ -46,6 +47,7 @@ static const int kernel_feature_bits[] = {
     VIRTIO_NET_F_MTU,
     VIRTIO_F_IOMMU_PLATFORM,
     VIRTIO_F_RING_PACKED,
+    VIRTIO_F_RING_RESET,
     VIRTIO_NET_F_HASH_REPORT,
     VHOST_INVALID_FEATURE_BIT
 };
@@ -387,21 +389,20 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
         } else {
             peer = qemu_get_peer(ncs, n->max_queue_pairs);
         }
-        r = vhost_net_start_one(get_vhost_net(peer), dev);
-
-        if (r < 0) {
-            goto err_start;
-        }
 
         if (peer->vring_enable) {
             /* restore vring enable state */
             r = vhost_set_vring_enable(peer, peer->vring_enable);
 
             if (r < 0) {
-                vhost_net_stop_one(get_vhost_net(peer), dev);
                 goto err_start;
             }
         }
+
+        r = vhost_net_start_one(get_vhost_net(peer), dev);
+        if (r < 0) {
+            goto err_start;
+        }
     }
 
     return 0;
@@ -531,3 +532,80 @@ int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
 
     return vhost_ops->vhost_net_set_mtu(&net->dev, mtu);
 }
+
+void vhost_net_virtqueue_reset(VirtIODevice *vdev, NetClientState *nc,
+                               int vq_index)
+{
+    VHostNetState *net = get_vhost_net(nc->peer);
+    const VhostOps *vhost_ops = net->dev.vhost_ops;
+    struct vhost_vring_file file = { .fd = -1 };
+    int idx;
+
+    /* should only be called after backend is connected */
+    assert(vhost_ops);
+
+    idx = vhost_ops->vhost_get_vq_index(&net->dev, vq_index);
+
+    if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
+        file.index = idx;
+        int r = vhost_net_set_backend(&net->dev, &file);
+        assert(r >= 0);
+    }
+
+    vhost_virtqueue_stop(&net->dev,
+                         vdev,
+                         net->dev.vqs + idx,
+                         net->dev.vq_index + idx);
+}
+
+int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc,
+                                int vq_index)
+{
+    VHostNetState *net = get_vhost_net(nc->peer);
+    const VhostOps *vhost_ops = net->dev.vhost_ops;
+    struct vhost_vring_file file = { };
+    int idx, r;
+
+    if (!net->dev.started) {
+        return -EBUSY;
+    }
+
+    /* should only be called after backend is connected */
+    assert(vhost_ops);
+
+    idx = vhost_ops->vhost_get_vq_index(&net->dev, vq_index);
+
+    r = vhost_virtqueue_start(&net->dev,
+                              vdev,
+                              net->dev.vqs + idx,
+                              net->dev.vq_index + idx);
+    if (r < 0) {
+        goto err_start;
+    }
+
+    if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
+        file.index = idx;
+        file.fd = net->backend;
+        r = vhost_net_set_backend(&net->dev, &file);
+        if (r < 0) {
+            r = -errno;
+            goto err_start;
+        }
+    }
+
+    return 0;
+
+err_start:
+    error_report("Error when restarting the queue.");
+
+    if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
+        file.fd = VHOST_FILE_UNBIND;
+        file.index = idx;
+        int r = vhost_net_set_backend(&net->dev, &file);
+        assert(r >= 0);
+    }
+
+    vhost_dev_stop(&net->dev, vdev);
+
+    return r;
+}