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