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186 lines
6.2 KiB
186 lines
6.2 KiB
From 42818e2bc6fa537fe52f7f0e6b094774a1eb00e1 Mon Sep 17 00:00:00 2001
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From: Cindy Lu <lulu@redhat.com>
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Date: Thu, 22 Dec 2022 15:04:48 +0800
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Subject: [PATCH 07/31] vhost: add support for configure interrupt
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cindy Lu <lulu@redhat.com>
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RH-MergeRequest: 132: vhost-vdpa: support config interrupt in vhost-vdpa
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RH-Bugzilla: 1905805
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [7/10] d58b439eb093f5dd3b7ca081af0ab75780e42917 (lulu6/qemu-kvm3)
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https://bugzilla.redhat.com/show_bug.cgi?id=1905805
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Add functions to support configure interrupt.
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The configure interrupt process will start in vhost_dev_start
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and stop in vhost_dev_stop.
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Also add the functions to support vhost_config_pending and
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vhost_config_mask.
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Signed-off-by: Cindy Lu <lulu@redhat.com>
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Message-Id: <20221222070451.936503-8-lulu@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit f9a09ca3ea69d108d828b7c82f1bd61b2df6fc96)
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Signed-off-by: Cindy Lu <lulu@redhat.com>
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---
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hw/virtio/vhost.c | 78 ++++++++++++++++++++++++++++++++++++++-
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include/hw/virtio/vhost.h | 4 ++
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2 files changed, 81 insertions(+), 1 deletion(-)
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diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
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index 7fb008bc9e..84dbb39e07 100644
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--- a/hw/virtio/vhost.c
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+++ b/hw/virtio/vhost.c
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@@ -1596,7 +1596,68 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
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file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n);
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r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file);
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if (r < 0) {
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- VHOST_OPS_DEBUG(r, "vhost_set_vring_call failed");
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+ error_report("vhost_set_vring_call failed %d", -r);
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+ }
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+}
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+
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+bool vhost_config_pending(struct vhost_dev *hdev)
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+{
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+ assert(hdev->vhost_ops);
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+ if ((hdev->started == false) ||
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+ (hdev->vhost_ops->vhost_set_config_call == NULL)) {
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+ return false;
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+ }
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+
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+ EventNotifier *notifier =
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+ &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier;
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+ return event_notifier_test_and_clear(notifier);
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+}
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+
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+void vhost_config_mask(struct vhost_dev *hdev, VirtIODevice *vdev, bool mask)
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+{
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+ int fd;
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+ int r;
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+ EventNotifier *notifier =
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+ &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier;
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+ EventNotifier *config_notifier = &vdev->config_notifier;
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+ assert(hdev->vhost_ops);
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+
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+ if ((hdev->started == false) ||
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+ (hdev->vhost_ops->vhost_set_config_call == NULL)) {
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+ return;
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+ }
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+ if (mask) {
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+ assert(vdev->use_guest_notifier_mask);
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+ fd = event_notifier_get_fd(notifier);
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+ } else {
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+ fd = event_notifier_get_fd(config_notifier);
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+ }
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+ r = hdev->vhost_ops->vhost_set_config_call(hdev, fd);
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+ if (r < 0) {
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+ error_report("vhost_set_config_call failed %d", -r);
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+ }
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+}
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+
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+static void vhost_stop_config_intr(struct vhost_dev *dev)
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+{
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+ int fd = -1;
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+ assert(dev->vhost_ops);
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+ if (dev->vhost_ops->vhost_set_config_call) {
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+ dev->vhost_ops->vhost_set_config_call(dev, fd);
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+ }
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+}
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+
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+static void vhost_start_config_intr(struct vhost_dev *dev)
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+{
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+ int r;
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+
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+ assert(dev->vhost_ops);
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+ int fd = event_notifier_get_fd(&dev->vdev->config_notifier);
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+ if (dev->vhost_ops->vhost_set_config_call) {
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+ r = dev->vhost_ops->vhost_set_config_call(dev, fd);
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+ if (!r) {
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+ event_notifier_set(&dev->vdev->config_notifier);
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+ }
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}
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}
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@@ -1836,6 +1897,16 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
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}
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}
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+ r = event_notifier_init(
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+ &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier, 0);
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+ if (r < 0) {
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+ return r;
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+ }
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+ event_notifier_test_and_clear(
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+ &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier);
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+ if (!vdev->use_guest_notifier_mask) {
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+ vhost_config_mask(hdev, vdev, true);
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+ }
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if (hdev->log_enabled) {
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uint64_t log_base;
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@@ -1874,6 +1945,7 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
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vhost_device_iotlb_miss(hdev, vq->used_phys, true);
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}
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}
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+ vhost_start_config_intr(hdev);
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return 0;
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fail_start:
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if (vrings) {
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@@ -1903,6 +1975,9 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
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/* should only be called after backend is connected */
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assert(hdev->vhost_ops);
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+ event_notifier_test_and_clear(
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+ &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier);
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+ event_notifier_test_and_clear(&vdev->config_notifier);
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trace_vhost_dev_stop(hdev, vdev->name, vrings);
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@@ -1925,6 +2000,7 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
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}
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memory_listener_unregister(&hdev->iommu_listener);
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}
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+ vhost_stop_config_intr(hdev);
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vhost_log_put(hdev, true);
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hdev->started = false;
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vdev->vhost_started = false;
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diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
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index 67a6807fac..05bedb2416 100644
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--- a/include/hw/virtio/vhost.h
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+++ b/include/hw/virtio/vhost.h
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@@ -33,6 +33,7 @@ struct vhost_virtqueue {
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unsigned used_size;
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EventNotifier masked_notifier;
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EventNotifier error_notifier;
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+ EventNotifier masked_config_notifier;
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struct vhost_dev *dev;
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};
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@@ -41,6 +42,7 @@ typedef unsigned long vhost_log_chunk_t;
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#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
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#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
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#define VHOST_INVALID_FEATURE_BIT (0xff)
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+#define VHOST_QUEUE_NUM_CONFIG_INR 0
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struct vhost_log {
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unsigned long long size;
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@@ -168,6 +170,8 @@ int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
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* Disable direct notifications to vhost device.
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*/
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void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
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+bool vhost_config_pending(struct vhost_dev *hdev);
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+void vhost_config_mask(struct vhost_dev *hdev, VirtIODevice *vdev, bool mask);
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/**
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* vhost_dev_is_started() - report status of vhost device
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--
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2.31.1
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