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* Thu Aug 24 2023 Miroslav Rezanina <mrezanin@redhat.com> - 8.0.0-13

Browse Source 
- kvm-vdpa-return-errno-in-vhost_vdpa_get_vring_group-erro.patch [RHEL-923]
- kvm-vdpa-move-CVQ-isolation-check-to-net_init_vhost_vdpa.patch [RHEL-923]
- kvm-vdpa-use-first-queue-SVQ-state-for-CVQ-default.patch [RHEL-923]
- kvm-vdpa-export-vhost_vdpa_set_vring_ready.patch [RHEL-923]
- kvm-vdpa-rename-vhost_vdpa_net_load-to-vhost_vdpa_net_cv.patch [RHEL-923]
- kvm-vdpa-move-vhost_vdpa_set_vring_ready-to-the-caller.patch [RHEL-923]
- kvm-vdpa-remove-net-cvq-migration-blocker.patch [RHEL-923]
- Resolves: RHEL-923
  (vhost shadow virtqueue: state restore through CVQ)
This commit is contained in:
Miroslav Rezanina 2023-08-24 01:18:12 -04:00
parent a586acaa36
commit 913b5bcaef
8 changed files with 764 additions and 1 deletions
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105
kvm-vdpa-export-vhost_vdpa_set_vring_ready.patch Normal file
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@ -0,0 +1,105 @@
From 636eb63cbf23b31fc9880528490ac4bef680305b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Wed, 25 Jan 2023 08:47:34 +0100
Subject: [PATCH 4/7] vdpa: export vhost_vdpa_set_vring_ready
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 199: CVQ migration support
RH-Jira: RHEL-923
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Commit: [4/7] 8d1fecec7a993b8b68e268e8783c200c158f5ee0 (eperezmartin/qemu-kvm)
The vhost-vdpa net backend needs to enable vrings in a different order
than default, so export it.
No functional change intended except for tracing, that now includes the
(virtio) index being enabled and the return value of the ioctl.
Still ignoring return value of this function if called from
vhost_vdpa_dev_start, as reorganize calling code around it is out of
the scope of this series.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
hw/virtio/trace-events | 2 +-
hw/virtio/vhost-vdpa.c | 25 +++++++++++++------------
include/hw/virtio/vhost-vdpa.h | 1 +
3 files changed, 15 insertions(+), 13 deletions(-)
diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 300dec8d3e..85b43cd8fe 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -48,7 +48,7 @@ vhost_vdpa_set_features(void *dev, uint64_t features) "dev: %p features: 0x%"PRI
vhost_vdpa_get_device_id(void *dev, uint32_t device_id) "dev: %p device_id %"PRIu32
vhost_vdpa_reset_device(void *dev, uint8_t status) "dev: %p status: 0x%"PRIx8
vhost_vdpa_get_vq_index(void *dev, int idx, int vq_idx) "dev: %p idx: %d vq idx: %d"
-vhost_vdpa_set_vring_ready(void *dev) "dev: %p"
+vhost_vdpa_set_vring_ready(void *dev, unsigned i, int r) "dev: %p, idx: %u, r: %d"
vhost_vdpa_dump_config(void *dev, const char *line) "dev: %p %s"
vhost_vdpa_set_config(void *dev, uint32_t offset, uint32_t size, uint32_t flags) "dev: %p offset: %"PRIu32" size: %"PRIu32" flags: 0x%"PRIx32
vhost_vdpa_get_config(void *dev, void *config, uint32_t config_len) "dev: %p config: %p config_len: %"PRIu32
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index c04f14420d..e4d0101327 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -733,18 +733,17 @@ static int vhost_vdpa_get_vq_index(struct vhost_dev *dev, int idx)
return idx;
}
-static int vhost_vdpa_set_vring_ready(struct vhost_dev *dev)
+int vhost_vdpa_set_vring_ready(struct vhost_vdpa *v, unsigned idx)
{
- int i;
- trace_vhost_vdpa_set_vring_ready(dev);
- for (i = 0; i < dev->nvqs; ++i) {
- struct vhost_vring_state state = {
- .index = dev->vq_index + i,
- .num = 1,
- };
- vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state);
- }
- return 0;
+ struct vhost_dev *dev = v->dev;
+ struct vhost_vring_state state = {
+ .index = idx,
+ .num = 1,
+ };
+ int r = vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state);
+
+ trace_vhost_vdpa_set_vring_ready(dev, idx, r);
+ return r;
}
static int vhost_vdpa_set_config_call(struct vhost_dev *dev,
@@ -1155,7 +1154,9 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started)
if (unlikely(!ok)) {
return -1;
}
- vhost_vdpa_set_vring_ready(dev);
+ for (int i = 0; i < dev->nvqs; ++i) {
+ vhost_vdpa_set_vring_ready(v, dev->vq_index + i);
+ }
} else {
vhost_vdpa_suspend(dev);
vhost_vdpa_svqs_stop(dev);
diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
index c278a2a8de..540642d304 100644
--- a/include/hw/virtio/vhost-vdpa.h
+++ b/include/hw/virtio/vhost-vdpa.h
@@ -55,6 +55,7 @@ typedef struct vhost_vdpa {
} VhostVDPA;
int vhost_vdpa_get_iova_range(int fd, struct vhost_vdpa_iova_range *iova_range);
+int vhost_vdpa_set_vring_ready(struct vhost_vdpa *v, unsigned idx);
int vhost_vdpa_dma_map(struct vhost_vdpa *v, uint32_t asid, hwaddr iova,
hwaddr size, void *vaddr, bool readonly);
--
2.39.3

286
kvm-vdpa-move-CVQ-isolation-check-to-net_init_vhost_vdpa.patch Normal file
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@ -0,0 +1,286 @@
From 1609e47511c9a02b26e0023ff6e1e999d7cdf179 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Fri, 26 May 2023 17:31:43 +0200
Subject: [PATCH 2/7] vdpa: move CVQ isolation check to net_init_vhost_vdpa
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 199: CVQ migration support
RH-Jira: RHEL-923
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Commit: [2/7] caed8f81c3e30e6147817e7f43225aa3ee90ff37 (eperezmartin/qemu-kvm)
Evaluating it at start time instead of initialization time may make the
guest capable of dynamically adding or removing migration blockers.
Also, moving to initialization reduces the number of ioctls in the
migration, reducing failure possibilities.
As a drawback we need to check for CVQ isolation twice: one time with no
MQ negotiated and another one acking it, as long as the device supports
it. This is because Vring ASID / group management is based on vq
indexes, but we don't know the index of CVQ before negotiating MQ.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230526153143.470745-3-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
net/vhost-vdpa.c | 155 ++++++++++++++++++++++++++++++++++-------------
1 file changed, 112 insertions(+), 43 deletions(-)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 801d4e0422..ce17e4416a 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -43,6 +43,10 @@ typedef struct VhostVDPAState {
/* The device always have SVQ enabled */
bool always_svq;
+
+ /* The device can isolate CVQ in its own ASID */
+ bool cvq_isolated;
+
bool started;
} VhostVDPAState;
@@ -369,15 +373,8 @@ static NetClientInfo net_vhost_vdpa_info = {
.check_peer_type = vhost_vdpa_check_peer_type,
};
-/**
- * Get vring virtqueue group
- *
- * @device_fd vdpa device fd
- * @vq_index Virtqueue index
- *
- * Return -errno in case of error, or vq group if success.
- */
-static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index)
+static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index,
+ Error **errp)
{
struct vhost_vring_state state = {
.index = vq_index,
@@ -386,8 +383,7 @@ static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index)
if (unlikely(r < 0)) {
r = -errno;
- error_report("Cannot get VQ %u group: %s", vq_index,
- g_strerror(errno));
+ error_setg_errno(errp, errno, "Cannot get VQ %u group", vq_index);
return r;
}
@@ -487,9 +483,9 @@ static int vhost_vdpa_net_cvq_start(NetClientState *nc)
{
VhostVDPAState *s, *s0;
struct vhost_vdpa *v;
- uint64_t backend_features;
int64_t cvq_group;
- int cvq_index, r;
+ int r;
+ Error *err = NULL;
assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
@@ -509,41 +505,22 @@ static int vhost_vdpa_net_cvq_start(NetClientState *nc)
/*
* If we early return in these cases SVQ will not be enabled. The migration
* will be blocked as long as vhost-vdpa backends will not offer _F_LOG.
- *
- * Calling VHOST_GET_BACKEND_FEATURES as they are not available in v->dev
- * yet.
*/
- r = ioctl(v->device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features);
- if (unlikely(r < 0)) {
- error_report("Cannot get vdpa backend_features: %s(%d)",
- g_strerror(errno), errno);
- return -1;
+ if (!vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) {
+ return 0;
}
- if (!(backend_features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID)) ||
- !vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) {
+
+ if (!s->cvq_isolated) {
return 0;
}
- /*
- * Check if all the virtqueues of the virtio device are in a different vq
- * than the last vq. VQ group of last group passed in cvq_group.
- */
- cvq_index = v->dev->vq_index_end - 1;
- cvq_group = vhost_vdpa_get_vring_group(v->device_fd, cvq_index);
+ cvq_group = vhost_vdpa_get_vring_group(v->device_fd,
+ v->dev->vq_index_end - 1,
+ &err);
if (unlikely(cvq_group < 0)) {
+ error_report_err(err);
return cvq_group;
}
- for (int i = 0; i < cvq_index; ++i) {
- int64_t group = vhost_vdpa_get_vring_group(v->device_fd, i);
-
- if (unlikely(group < 0)) {
- return group;
- }
-
- if (group == cvq_group) {
- return 0;
- }
- }
r = vhost_vdpa_set_address_space_id(v, cvq_group, VHOST_VDPA_NET_CVQ_ASID);
if (unlikely(r < 0)) {
@@ -806,6 +783,87 @@ static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = {
.avail_handler = vhost_vdpa_net_handle_ctrl_avail,
};
+/**
+ * Probe if CVQ is isolated
+ *
+ * @device_fd The vdpa device fd
+ * @features Features offered by the device.
+ * @cvq_index The control vq pair index
+ *
+ * Returns <0 in case of failure, 0 if false and 1 if true.
+ */
+static int vhost_vdpa_probe_cvq_isolation(int device_fd, uint64_t features,
+ int cvq_index, Error **errp)
+{
+ uint64_t backend_features;
+ int64_t cvq_group;
+ uint8_t status = VIRTIO_CONFIG_S_ACKNOWLEDGE |
+ VIRTIO_CONFIG_S_DRIVER |
+ VIRTIO_CONFIG_S_FEATURES_OK;
+ int r;
+
+ ERRP_GUARD();
+
+ r = ioctl(device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features);
+ if (unlikely(r < 0)) {
+ error_setg_errno(errp, errno, "Cannot get vdpa backend_features");
+ return r;
+ }
+
+ if (!(backend_features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) {
+ return 0;
+ }
+
+ r = ioctl(device_fd, VHOST_SET_FEATURES, &features);
+ if (unlikely(r)) {
+ error_setg_errno(errp, errno, "Cannot set features");
+ }
+
+ r = ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status);
+ if (unlikely(r)) {
+ error_setg_errno(errp, -r, "Cannot set device features");
+ goto out;
+ }
+
+ cvq_group = vhost_vdpa_get_vring_group(device_fd, cvq_index, errp);
+ if (unlikely(cvq_group < 0)) {
+ if (cvq_group != -ENOTSUP) {
+ r = cvq_group;
+ goto out;
+ }
+
+ /*
+ * The kernel report VHOST_BACKEND_F_IOTLB_ASID if the vdpa frontend
+ * support ASID even if the parent driver does not. The CVQ cannot be
+ * isolated in this case.
+ */
+ error_free(*errp);
+ *errp = NULL;
+ r = 0;
+ goto out;
+ }
+
+ for (int i = 0; i < cvq_index; ++i) {
+ int64_t group = vhost_vdpa_get_vring_group(device_fd, i, errp);
+ if (unlikely(group < 0)) {
+ r = group;
+ goto out;
+ }
+
+ if (group == (int64_t)cvq_group) {
+ r = 0;
+ goto out;
+ }
+ }
+
+ r = 1;
+
+out:
+ status = 0;
+ ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status);
+ return r;
+}
+
static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
const char *device,
const char *name,
@@ -815,16 +873,26 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
bool is_datapath,
bool svq,
struct vhost_vdpa_iova_range iova_range,
- uint64_t features)
+ uint64_t features,
+ Error **errp)
{
NetClientState *nc = NULL;
VhostVDPAState *s;
int ret = 0;
assert(name);
+ int cvq_isolated;
+
if (is_datapath) {
nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device,
name);
} else {
+ cvq_isolated = vhost_vdpa_probe_cvq_isolation(vdpa_device_fd, features,
+ queue_pair_index * 2,
+ errp);
+ if (unlikely(cvq_isolated < 0)) {
+ return NULL;
+ }
+
nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer,
device, name);
}
@@ -851,6 +919,7 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops;
s->vhost_vdpa.shadow_vq_ops_opaque = s;
+ s->cvq_isolated = cvq_isolated;
/*
* TODO: We cannot migrate devices with CVQ and no x-svq enabled as
@@ -982,7 +1051,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
for (i = 0; i < queue_pairs; i++) {
ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
vdpa_device_fd, i, 2, true, opts->x_svq,
- iova_range, features);
+ iova_range, features, errp);
if (!ncs[i])
goto err;
}
@@ -990,7 +1059,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
if (has_cvq) {
nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
vdpa_device_fd, i, 1, false,
- opts->x_svq, iova_range, features);
+ opts->x_svq, iova_range, features, errp);
if (!nc)
goto err;
}
--
2.39.3

134
kvm-vdpa-move-vhost_vdpa_set_vring_ready-to-the-caller.patch Normal file
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@ -0,0 +1,134 @@
From 09bf0febef2512f00e71edca0fcbaf452652c2c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Thu, 10 Aug 2023 11:27:28 +0200
Subject: [PATCH 6/7] vdpa: move vhost_vdpa_set_vring_ready to the caller
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 199: CVQ migration support
RH-Jira: RHEL-923
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Commit: [6/7] cf4fd1071ca127914c8e8d6aefec451cad97ecc1 (eperezmartin/qemu-kvm)
Doing that way allows CVQ to be enabled before the dataplane vqs,
restoring the state as MQ or MAC addresses properly in the case of a
migration.
The patch does it by defining a ->load NetClientInfo callback also for
dataplane. Ideally, this should be done by an independent patch, but
the function is already static so it would only add an empty
vhost_vdpa_net_data_load stub.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
v3:
* Fix subject typo
* Expand patch message so it explains why
---
hw/virtio/vdpa-dev.c | 3 +++
hw/virtio/vhost-vdpa.c | 3 ---
net/vhost-vdpa.c | 41 +++++++++++++++++++++++++++++++----------
3 files changed, 34 insertions(+), 13 deletions(-)
diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
index 01b41eb0f1..8c47d643bf 100644
--- a/hw/virtio/vdpa-dev.c
+++ b/hw/virtio/vdpa-dev.c
@@ -256,6 +256,9 @@ static int vhost_vdpa_device_start(VirtIODevice *vdev, Error **errp)
error_setg_errno(errp, -ret, "Error starting vhost");
goto err_guest_notifiers;
}
+ for (i = 0; i < s->dev.nvqs; ++i) {
+ vhost_vdpa_set_vring_ready(&s->vdpa, i);
+ }
s->started = true;
/*
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index e4d0101327..0d9d311abd 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -1154,9 +1154,6 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started)
if (unlikely(!ok)) {
return -1;
}
- for (int i = 0; i < dev->nvqs; ++i) {
- vhost_vdpa_set_vring_ready(v, dev->vq_index + i);
- }
} else {
vhost_vdpa_suspend(dev);
vhost_vdpa_svqs_stop(dev);
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index a1b16bbc52..47b87bf80d 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -344,6 +344,22 @@ static int vhost_vdpa_net_data_start(NetClientState *nc)
return 0;
}
+static int vhost_vdpa_net_data_load(NetClientState *nc)
+{
+ VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
+ struct vhost_vdpa *v = &s->vhost_vdpa;
+ bool has_cvq = v->dev->vq_index_end % 2;
+
+ if (has_cvq) {
+ return 0;
+ }
+
+ for (int i = 0; i < v->dev->nvqs; ++i) {
+ vhost_vdpa_set_vring_ready(v, i + v->dev->vq_index);
+ }
+ return 0;
+}
+
static void vhost_vdpa_net_client_stop(NetClientState *nc)
{
VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
@@ -366,6 +382,7 @@ static NetClientInfo net_vhost_vdpa_info = {
.size = sizeof(VhostVDPAState),
.receive = vhost_vdpa_receive,
.start = vhost_vdpa_net_data_start,
+ .load = vhost_vdpa_net_data_load,
.stop = vhost_vdpa_net_client_stop,
.cleanup = vhost_vdpa_cleanup,
.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
@@ -682,18 +699,22 @@ static int vhost_vdpa_net_cvq_load(NetClientState *nc)
assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
- if (!v->shadow_vqs_enabled) {
- return 0;
- }
+ vhost_vdpa_set_vring_ready(v, v->dev->vq_index);
- n = VIRTIO_NET(v->dev->vdev);
- r = vhost_vdpa_net_load_mac(s, n);
- if (unlikely(r < 0)) {
- return r;
+ if (v->shadow_vqs_enabled) {
+ n = VIRTIO_NET(v->dev->vdev);
+ r = vhost_vdpa_net_load_mac(s, n);
+ if (unlikely(r < 0)) {
+ return r;
+ }
+ r = vhost_vdpa_net_load_mq(s, n);
+ if (unlikely(r)) {
+ return r;
+ }
}
- r = vhost_vdpa_net_load_mq(s, n);
- if (unlikely(r)) {
- return r;
+
+ for (int i = 0; i < v->dev->vq_index; ++i) {
+ vhost_vdpa_set_vring_ready(v, i);
}
return 0;
--
2.39.3

51
kvm-vdpa-remove-net-cvq-migration-blocker.patch Normal file
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@ -0,0 +1,51 @@
From 46d5b861a39b7d0d3222162e6b7707526c131230 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Fri, 24 Mar 2023 13:28:15 +0100
Subject: [PATCH 7/7] vdpa: remove net cvq migration blocker
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 199: CVQ migration support
RH-Jira: RHEL-923
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Commit: [7/7] 9542e305c7ea3a47e0f1fe0629281238b0bb2111 (eperezmartin/qemu-kvm)
Now that we have add migration blockers if the device does not support
all the needed features, remove the general blocker applied to all net
devices with CVQ.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
net/vhost-vdpa.c | 12 ------------
1 file changed, 12 deletions(-)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 47b87bf80d..6e03db4afa 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -941,18 +941,6 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops;
s->vhost_vdpa.shadow_vq_ops_opaque = s;
s->cvq_isolated = cvq_isolated;
-
- /*
- * TODO: We cannot migrate devices with CVQ and no x-svq enabled as
- * there is no way to set the device state (MAC, MQ, etc) before
- * starting the datapath.
- *
- * Migration blocker ownership now belongs to s->vhost_vdpa.
- */
- if (!svq) {
- error_setg(&s->vhost_vdpa.migration_blocker,
- "net vdpa cannot migrate with CVQ feature");
- }
}
ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs);
if (ret) {
--
2.39.3

49
kvm-vdpa-rename-vhost_vdpa_net_load-to-vhost_vdpa_net_cv.patch Normal file
View File

@ -0,0 +1,49 @@
From db7ca7692e264e8bf1bd9e08e3de7a92fc76a363 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Wed, 9 Aug 2023 18:07:26 +0200
Subject: [PATCH 5/7] vdpa: rename vhost_vdpa_net_load to
vhost_vdpa_net_cvq_load
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 199: CVQ migration support
RH-Jira: RHEL-923
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Commit: [5/7] aea91f3274786665725af892eb905818eb0f44f1 (eperezmartin/qemu-kvm)
Next patches will add the corresponding data load.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
net/vhost-vdpa.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 29d3fd3ca6..a1b16bbc52 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -673,7 +673,7 @@ static int vhost_vdpa_net_load_mq(VhostVDPAState *s,
return *s->status != VIRTIO_NET_OK;
}
-static int vhost_vdpa_net_load(NetClientState *nc)
+static int vhost_vdpa_net_cvq_load(NetClientState *nc)
{
VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
struct vhost_vdpa *v = &s->vhost_vdpa;
@@ -704,7 +704,7 @@ static NetClientInfo net_vhost_vdpa_cvq_info = {
.size = sizeof(VhostVDPAState),
.receive = vhost_vdpa_receive,
.start = vhost_vdpa_net_cvq_start,
- .load = vhost_vdpa_net_load,
+ .load = vhost_vdpa_net_cvq_load,
.stop = vhost_vdpa_net_cvq_stop,
.cleanup = vhost_vdpa_cleanup,
.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
--
2.39.3

67
kvm-vdpa-return-errno-in-vhost_vdpa_get_vring_group-erro.patch Normal file
View File

@ -0,0 +1,67 @@
From 09583f39d51d16079c9fda32545d7a44b6f5c8c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Fri, 26 May 2023 17:31:42 +0200
Subject: [PATCH 1/7] vdpa: return errno in vhost_vdpa_get_vring_group error
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 199: CVQ migration support
RH-Jira: RHEL-923
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Commit: [1/7] 89745b1828a1af535c40657022d385250688d11d (eperezmartin/qemu-kvm)
We need to tell in the caller, as some errors are expected in a normal
workflow. In particular, parent drivers in recent kernels with
VHOST_BACKEND_F_IOTLB_ASID may not support vring groups. In that case,
-ENOTSUP is returned.
This is the case of vp_vdpa in Linux 6.2.
Next patches in this series will use that information to know if it must
abort or not. Also, next patches return properly an errp instead of
printing with error_report.
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230526153143.470745-2-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
net/vhost-vdpa.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 1ae839da34..801d4e0422 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -369,6 +369,14 @@ static NetClientInfo net_vhost_vdpa_info = {
.check_peer_type = vhost_vdpa_check_peer_type,
};
+/**
+ * Get vring virtqueue group
+ *
+ * @device_fd vdpa device fd
+ * @vq_index Virtqueue index
+ *
+ * Return -errno in case of error, or vq group if success.
+ */
static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index)
{
struct vhost_vring_state state = {
@@ -377,6 +385,7 @@ static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index)
int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, &state);
if (unlikely(r < 0)) {
+ r = -errno;
error_report("Cannot get VQ %u group: %s", vq_index,
g_strerror(errno));
return r;
--
2.39.3

46
kvm-vdpa-use-first-queue-SVQ-state-for-CVQ-default.patch Normal file
View File

@ -0,0 +1,46 @@
From 726662aee0bc295f6931b7aba1bd68f033e949aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Thu, 10 Aug 2023 16:08:18 +0200
Subject: [PATCH 3/7] vdpa: use first queue SVQ state for CVQ default
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 199: CVQ migration support
RH-Jira: RHEL-923
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Commit: [3/7] 5c98f11b5080552a62c8e37ff2c23339455b7b86 (eperezmartin/qemu-kvm)
Previous to this patch the only way CVQ would be shadowed is if it does
support to isolate CVQ group or if all vqs were shadowed from the
beginning. The second condition was checked at the beginning, and no
more configuration was done.
After this series we need to check if data queues are shadowed because
they are in the middle of the migration. As checking if they are
shadowed already covers the previous case, let's just mimic it.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
net/vhost-vdpa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index ce17e4416a..29d3fd3ca6 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -494,7 +494,7 @@ static int vhost_vdpa_net_cvq_start(NetClientState *nc)
s0 = vhost_vdpa_net_first_nc_vdpa(s);
v->shadow_data = s0->vhost_vdpa.shadow_vqs_enabled;
- v->shadow_vqs_enabled = s->always_svq;
+ v->shadow_vqs_enabled = s0->vhost_vdpa.shadow_vqs_enabled;
s->vhost_vdpa.address_space_id = VHOST_VDPA_GUEST_PA_ASID;
if (s->vhost_vdpa.shadow_data) {
--
2.39.3

27
qemu-kvm.spec
View File

@ -149,7 +149,7 @@ Obsoletes: %{name}-block-ssh <= %{epoch}:%{version} \
Summary: QEMU is a machine emulator and virtualizer
Name: qemu-kvm
Version: 8.0.0
Release: 12%{?rcrel}%{?dist}%{?cc_suffix}
Release: 13%{?rcrel}%{?dist}%{?cc_suffix}
# Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
# Epoch 15 used for RHEL 8
# Epoch 17 used for RHEL 9 (due to release versioning offset in RHEL 8.5)
@ -532,6 +532,20 @@ Patch184: kvm-target-i386-Add-missing-feature-bits-in-EPYC-Milan-m.patch
Patch185: kvm-target-i386-Add-VNMI-and-automatic-IBRS-feature-bits.patch
# For bz#2094913 - Add EPYC-Genoa CPU model in qemu
Patch186: kvm-target-i386-Add-EPYC-Genoa-model-to-support-Zen-4-pr.patch
# For RHEL-923 - vhost shadow virtqueue: state restore through CVQ
Patch187: kvm-vdpa-return-errno-in-vhost_vdpa_get_vring_group-erro.patch
# For RHEL-923 - vhost shadow virtqueue: state restore through CVQ
Patch188: kvm-vdpa-move-CVQ-isolation-check-to-net_init_vhost_vdpa.patch
# For RHEL-923 - vhost shadow virtqueue: state restore through CVQ
Patch189: kvm-vdpa-use-first-queue-SVQ-state-for-CVQ-default.patch
# For RHEL-923 - vhost shadow virtqueue: state restore through CVQ
Patch190: kvm-vdpa-export-vhost_vdpa_set_vring_ready.patch
# For RHEL-923 - vhost shadow virtqueue: state restore through CVQ
Patch191: kvm-vdpa-rename-vhost_vdpa_net_load-to-vhost_vdpa_net_cv.patch
# For RHEL-923 - vhost shadow virtqueue: state restore through CVQ
Patch192: kvm-vdpa-move-vhost_vdpa_set_vring_ready-to-the-caller.patch
# For RHEL-923 - vhost shadow virtqueue: state restore through CVQ
Patch193: kvm-vdpa-remove-net-cvq-migration-blocker.patch
%if %{have_clang}
BuildRequires: clang
@ -1593,6 +1607,17 @@ useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
%endif
%changelog
* Thu Aug 24 2023 Miroslav Rezanina <mrezanin@redhat.com> - 8.0.0-13
- kvm-vdpa-return-errno-in-vhost_vdpa_get_vring_group-erro.patch [RHEL-923]
- kvm-vdpa-move-CVQ-isolation-check-to-net_init_vhost_vdpa.patch [RHEL-923]
- kvm-vdpa-use-first-queue-SVQ-state-for-CVQ-default.patch [RHEL-923]
- kvm-vdpa-export-vhost_vdpa_set_vring_ready.patch [RHEL-923]
- kvm-vdpa-rename-vhost_vdpa_net_load-to-vhost_vdpa_net_cv.patch [RHEL-923]
- kvm-vdpa-move-vhost_vdpa_set_vring_ready-to-the-caller.patch [RHEL-923]
- kvm-vdpa-remove-net-cvq-migration-blocker.patch [RHEL-923]
- Resolves: RHEL-923
(vhost shadow virtqueue: state restore through CVQ)
* Mon Aug 21 2023 Miroslav Rezanina <mrezanin@redhat.com> - 8.0.0-12
- kvm-target-i386-allow-versioned-CPUs-to-specify-new-cach.patch [bz#2094913]
- kvm-target-i386-Add-new-EPYC-CPU-versions-with-updated-c.patch [bz#2094913]