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From 672f445642c474d54500ca8d080d64d8a8d4dbd9 Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Date: Thu, 21 Jun 2018 18:54:45 +0200
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Subject: [PATCH 166/268] libvhost-user: support host notifier
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RH-Author: plai@redhat.com
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Message-id: <1529607285-9942-11-git-send-email-plai@redhat.com>
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Patchwork-id: 80939
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O-Subject: [RHEL7.6 PATCH BZ 1526645 10/10] libvhost-user: support host notifier
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Bugzilla: 1526645
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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From: Tiwei Bie <tiwei.bie@intel.com>
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This patch introduces the host notifier support in
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libvhost-user. A new API is added to support setting
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host notifier for each queue.
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Signed-off-by: Tiwei Bie <tiwei.bie@intel.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 d84599f56c820d8c1ac9928a76500dcdfbbf194d)
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Signed-off-by: Paul Lai <plai@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 contrib/libvhost-user/libvhost-user.c | 81 +++++++++++++++++++++++++++++++----
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 contrib/libvhost-user/libvhost-user.h | 32 ++++++++++++++
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 2 files changed, 105 insertions(+), 8 deletions(-)
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diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c
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index beeed0c..fa06eee 100644
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--- a/contrib/libvhost-user/libvhost-user.c
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+++ b/contrib/libvhost-user/libvhost-user.c
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@@ -314,11 +314,6 @@ vu_message_write(VuDev *dev, int conn_fd, VhostUserMsg *vmsg)
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         msg.msg_controllen = 0;
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     }
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-    /* Set the version in the flags when sending the reply */
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-    vmsg->flags &= ~VHOST_USER_VERSION_MASK;
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-    vmsg->flags |= VHOST_USER_VERSION;
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-    vmsg->flags |= VHOST_USER_REPLY_MASK;
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-
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     do {
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         rc = sendmsg(conn_fd, &msg, 0);
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     } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
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@@ -339,6 +334,39 @@ vu_message_write(VuDev *dev, int conn_fd, VhostUserMsg *vmsg)
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     return true;
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 }
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+static bool
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+vu_send_reply(VuDev *dev, int conn_fd, VhostUserMsg *vmsg)
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+{
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+    /* Set the version in the flags when sending the reply */
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+    vmsg->flags &= ~VHOST_USER_VERSION_MASK;
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+    vmsg->flags |= VHOST_USER_VERSION;
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+    vmsg->flags |= VHOST_USER_REPLY_MASK;
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+
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+    return vu_message_write(dev, conn_fd, vmsg);
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+}
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+
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+static bool
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+vu_process_message_reply(VuDev *dev, const VhostUserMsg *vmsg)
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+{
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+    VhostUserMsg msg_reply;
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+
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+    if ((vmsg->flags & VHOST_USER_NEED_REPLY_MASK) == 0) {
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+        return true;
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+    }
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+
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+    if (!vu_message_read(dev, dev->slave_fd, &msg_reply)) {
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+        return false;
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+    }
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+
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+    if (msg_reply.request != vmsg->request) {
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+        DPRINT("Received unexpected msg type. Expected %d received %d",
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+               vmsg->request, msg_reply.request);
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+        return false;
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+    }
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+
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+    return msg_reply.payload.u64 == 0;
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+}
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+
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 /* Kick the log_call_fd if required. */
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 static void
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 vu_log_kick(VuDev *dev)
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@@ -534,7 +562,7 @@ vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg)
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     /* Send the message back to qemu with the addresses filled in */
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     vmsg->fd_num = 0;
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-    if (!vu_message_write(dev, dev->sock, vmsg)) {
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+    if (!vu_send_reply(dev, dev->sock, vmsg)) {
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         vu_panic(dev, "failed to respond to set-mem-table for postcopy");
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         return false;
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     }
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@@ -914,6 +942,41 @@ void vu_set_queue_handler(VuDev *dev, VuVirtq *vq,
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     }
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 }
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+bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
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+                                int size, int offset)
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+{
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+    int qidx = vq - dev->vq;
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+    int fd_num = 0;
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+    VhostUserMsg vmsg = {
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+        .request = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
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+        .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
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+        .size = sizeof(vmsg.payload.area),
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+        .payload.area = {
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+            .u64 = qidx & VHOST_USER_VRING_IDX_MASK,
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+            .size = size,
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+            .offset = offset,
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+        },
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+    };
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+
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+    if (fd == -1) {
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+        vmsg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
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+    } else {
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+        vmsg.fds[fd_num++] = fd;
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+    }
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+
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+    vmsg.fd_num = fd_num;
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+
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+    if ((dev->protocol_features & VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD) == 0) {
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+        return false;
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+    }
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+
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+    if (!vu_message_write(dev, dev->slave_fd, &vmsg)) {
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+        return false;
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+    }
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+
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+    return vu_process_message_reply(dev, &vmsg);
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+}
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+
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 static bool
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 vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vmsg)
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 {
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@@ -966,7 +1029,9 @@ static bool
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 vu_get_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg)
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 {
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     uint64_t features = 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD |
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-                        1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ;
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+                        1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ |
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+                        1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER |
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+                        1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD;
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     if (have_userfault()) {
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         features |= 1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT;
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@@ -1250,7 +1315,7 @@ vu_dispatch(VuDev *dev)
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         goto end;
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     }
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-    if (!vu_message_write(dev, dev->sock, &vmsg)) {
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+    if (!vu_send_reply(dev, dev->sock, &vmsg)) {
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         goto end;
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     }
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diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/libvhost-user.h
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index b27075e..4aa55b4 100644
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--- a/contrib/libvhost-user/libvhost-user.h
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+++ b/contrib/libvhost-user/libvhost-user.h
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@@ -51,6 +51,8 @@ enum VhostUserProtocolFeature {
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     VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7,
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     VHOST_USER_PROTOCOL_F_PAGEFAULT = 8,
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     VHOST_USER_PROTOCOL_F_CONFIG = 9,
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+    VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD = 10,
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+    VHOST_USER_PROTOCOL_F_HOST_NOTIFIER = 11,
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     VHOST_USER_PROTOCOL_F_MAX
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 };
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@@ -92,6 +94,14 @@ typedef enum VhostUserRequest {
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     VHOST_USER_MAX
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 } VhostUserRequest;
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+typedef enum VhostUserSlaveRequest {
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+    VHOST_USER_SLAVE_NONE = 0,
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+    VHOST_USER_SLAVE_IOTLB_MSG = 1,
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+    VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2,
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+    VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3,
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+    VHOST_USER_SLAVE_MAX
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+}  VhostUserSlaveRequest;
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+
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 typedef struct VhostUserMemoryRegion {
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     uint64_t guest_phys_addr;
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     uint64_t memory_size;
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@@ -122,6 +132,12 @@ static VhostUserConfig c __attribute__ ((unused));
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                                    + sizeof(c.size) \
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                                    + sizeof(c.flags))
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+typedef struct VhostUserVringArea {
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+    uint64_t u64;
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+    uint64_t size;
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+    uint64_t offset;
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+} VhostUserVringArea;
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+
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 #if defined(_WIN32)
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 # define VU_PACKED __attribute__((gcc_struct, packed))
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 #else
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@@ -133,6 +149,7 @@ typedef struct VhostUserMsg {
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 #define VHOST_USER_VERSION_MASK     (0x3)
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 #define VHOST_USER_REPLY_MASK       (0x1 << 2)
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+#define VHOST_USER_NEED_REPLY_MASK  (0x1 << 3)
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     uint32_t flags;
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     uint32_t size; /* the following payload size */
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@@ -145,6 +162,7 @@ typedef struct VhostUserMsg {
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         VhostUserMemory memory;
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         VhostUserLog log;
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         VhostUserConfig config;
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+        VhostUserVringArea area;
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     } payload;
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     int fds[VHOST_MEMORY_MAX_NREGIONS];
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@@ -368,6 +386,20 @@ VuVirtq *vu_get_queue(VuDev *dev, int qidx);
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 void vu_set_queue_handler(VuDev *dev, VuVirtq *vq,
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                           vu_queue_handler_cb handler);
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+/**
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+ * vu_set_queue_host_notifier:
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+ * @dev: a VuDev context
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+ * @vq: a VuVirtq queue
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+ * @fd: a file descriptor
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+ * @size: host page size
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+ * @offset: notifier offset in @fd file
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+ *
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+ * Set queue's host notifier. This function may be called several
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+ * times for the same queue. If called with -1 @fd, the notifier
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+ * is removed.
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+ */
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+bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
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+                                int size, int offset);
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 /**
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  * vu_queue_set_notification:
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-- 
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1.8.3.1
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