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Thu, 02 Feb 2023 05:45:11 +0000 Received: from pps.filterd (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (8.17.1.5/8.17.1.5) with ESMTP id 31254Ppp013015; Thu, 2 Feb 2023 05:45:10 GMT Received: from bruckner.us.oracle.com (dhcp-10-65-133-23.vpn.oracle.com [10.65.133.23]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 3nct5f5gb1-18 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 02 Feb 2023 05:45:10 +0000 From: John Johnson To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, philmd@linaro.org Subject: [PATCH v2 17/23] vfio-user: dma map/unmap operations Date: Wed, 1 Feb 2023 21:55:53 -0800 Message-Id: <1ec25a5832299083fee3c90bd89561f5c1d42ba9.1675228037.git.john.g.johnson@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-01_15,2023-01-31_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 malwarescore=0 adultscore=0 bulkscore=0 mlxscore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302020053 X-Proofpoint-GUID: WwtUmMwLk0QceoY-8RdtDSPnuJrVFFwv X-Proofpoint-ORIG-GUID: WwtUmMwLk0QceoY-8RdtDSPnuJrVFFwv Received-SPF: pass client-ip=205.220.165.32; envelope-from=john.g.johnson@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add ability to do async operations during memory transactions Signed-off-by: Jagannathan Raman Signed-off-by: Elena Ufimtseva Signed-off-by: John G Johnson --- hw/vfio/user-protocol.h | 32 ++++++ include/hw/vfio/vfio-common.h | 4 +- hw/vfio/common.c | 64 +++++++++--- hw/vfio/user.c | 224 ++++++++++++++++++++++++++++++++++++++++++ hw/vfio/trace-events | 2 + 5 files changed, 311 insertions(+), 15 deletions(-) diff --git a/hw/vfio/user-protocol.h b/hw/vfio/user-protocol.h index 48dd475..109076d 100644 --- a/hw/vfio/user-protocol.h +++ b/hw/vfio/user-protocol.h @@ -114,6 +114,31 @@ typedef struct { #define VFIO_USER_DEF_MAX_BITMAP (256 * 1024 * 1024) /* + * VFIO_USER_DMA_MAP + * imported from struct vfio_iommu_type1_dma_map + */ +typedef struct { + VFIOUserHdr hdr; + uint32_t argsz; + uint32_t flags; + uint64_t offset; /* FD offset */ + uint64_t iova; + uint64_t size; +} VFIOUserDMAMap; + +/* + * VFIO_USER_DMA_UNMAP + * imported from struct vfio_iommu_type1_dma_unmap + */ +typedef struct { + VFIOUserHdr hdr; + uint32_t argsz; + uint32_t flags; + uint64_t iova; + uint64_t size; +} VFIOUserDMAUnmap; + +/* * VFIO_USER_DEVICE_GET_INFO * imported from struct vfio_device_info */ @@ -176,4 +201,11 @@ typedef struct { char data[]; } VFIOUserRegionRW; +/*imported from struct vfio_bitmap */ +typedef struct { + uint64_t pgsize; + uint64_t size; + char data[]; +} VFIOUserBitmap; + #endif /* VFIO_USER_PROTOCOL_H */ diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index b0c4453..ee6ad8f 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -90,6 +90,7 @@ typedef struct VFIOContainer { VFIOContainerIO *io; bool initialized; bool dirty_pages_supported; + bool async_ops; uint64_t dirty_pgsizes; uint64_t max_dirty_bitmap_size; unsigned long pgsizes; @@ -187,7 +188,7 @@ struct VFIODeviceIO { }; struct VFIOContainerIO { - int (*dma_map)(VFIOContainer *container, + int (*dma_map)(VFIOContainer *container, MemoryRegion *mr, struct vfio_iommu_type1_dma_map *map); int (*dma_unmap)(VFIOContainer *container, struct vfio_iommu_type1_dma_unmap *unmap, @@ -195,6 +196,7 @@ struct VFIOContainerIO { int (*dirty_bitmap)(VFIOContainer *container, struct vfio_iommu_type1_dirty_bitmap *bitmap, struct vfio_iommu_type1_dirty_bitmap_get *range); + void (*wait_commit)(VFIOContainer *container); }; extern VFIODeviceIO vfio_dev_io_ioctl; diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 6f99907..f04fd20 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -508,7 +508,7 @@ static int vfio_dma_unmap(VFIOContainer *container, return container->io->dma_unmap(container, &unmap, NULL); } -static int vfio_dma_map(VFIOContainer *container, hwaddr iova, +static int vfio_dma_map(VFIOContainer *container, MemoryRegion *mr, hwaddr iova, ram_addr_t size, void *vaddr, bool readonly) { struct vfio_iommu_type1_dma_map map = { @@ -524,8 +524,7 @@ static int vfio_dma_map(VFIOContainer *container, hwaddr iova, map.flags |= VFIO_DMA_MAP_FLAG_WRITE; } - ret = container->io->dma_map(container, &map); - + ret = container->io->dma_map(container, mr, &map); if (ret < 0) { error_report("VFIO_MAP_DMA failed: %s", strerror(-ret)); } @@ -587,7 +586,8 @@ static bool vfio_listener_skipped_section(MemoryRegionSection *section) /* Called with rcu_read_lock held. */ static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, - ram_addr_t *ram_addr, bool *read_only) + ram_addr_t *ram_addr, bool *read_only, + MemoryRegion **mrp) { MemoryRegion *mr; hwaddr xlat; @@ -668,6 +668,10 @@ static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, *read_only = !writable || mr->readonly; } + if (mrp != NULL) { + *mrp = mr; + } + return true; } @@ -675,6 +679,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) { VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); VFIOContainer *container = giommu->container; + MemoryRegion *mr; hwaddr iova = iotlb->iova + giommu->iommu_offset; void *vaddr; int ret; @@ -693,7 +698,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { bool read_only; - if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) { + if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only, &mr)) { goto out; } /* @@ -703,14 +708,14 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) * of vaddr will always be there, even if the memory object is * destroyed and its backing memory munmap-ed. */ - ret = vfio_dma_map(container, iova, + ret = vfio_dma_map(container, mr, iova, iotlb->addr_mask + 1, vaddr, read_only); if (ret) { error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " - "0x%"HWADDR_PRIx", %p) = %d (%m)", + "0x%"HWADDR_PRIx", %p)", container, iova, - iotlb->addr_mask + 1, vaddr, ret); + iotlb->addr_mask + 1, vaddr); } } else { ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb); @@ -765,7 +770,7 @@ static int vfio_ram_discard_notify_populate(RamDiscardListener *rdl, section->offset_within_address_space; vaddr = memory_region_get_ram_ptr(section->mr) + start; - ret = vfio_dma_map(vrdl->container, iova, next - start, + ret = vfio_dma_map(vrdl->container, section->mr, iova, next - start, vaddr, section->readonly); if (ret) { /* Rollback */ @@ -889,6 +894,29 @@ static bool vfio_known_safe_misalignment(MemoryRegionSection *section) return true; } +static void vfio_listener_begin(MemoryListener *listener) +{ + VFIOContainer *container = container_of(listener, VFIOContainer, listener); + + /* + * When DMA space is the physical address space, + * the region add/del listeners will fire during + * memory update transactions. These depend on BQL + * being held, so do any resulting map/demap ops async + * while keeping BQL. + */ + container->async_ops = true; +} + +static void vfio_listener_commit(MemoryListener *listener) +{ + VFIOContainer *container = container_of(listener, VFIOContainer, listener); + + /* wait here for any async requests sent during the transaction */ + container->io->wait_commit(container); + container->async_ops = false; +} + static void vfio_listener_region_add(MemoryListener *listener, MemoryRegionSection *section) { @@ -1096,12 +1124,12 @@ static void vfio_listener_region_add(MemoryListener *listener, } } - ret = vfio_dma_map(container, iova, int128_get64(llsize), + ret = vfio_dma_map(container, section->mr, iova, int128_get64(llsize), vaddr, section->readonly); if (ret) { error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " - "0x%"HWADDR_PRIx", %p) = %d (%m)", - container, iova, int128_get64(llsize), vaddr, ret); + "0x%"HWADDR_PRIx", %p)", + container, iova, int128_get64(llsize), vaddr); if (memory_region_is_ram_device(section->mr)) { /* Allow unexpected mappings not to be fatal for RAM devices */ error_report_err(err); @@ -1370,7 +1398,7 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) } rcu_read_lock(); - if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) { + if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL, NULL)) { int ret; ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1, @@ -1488,6 +1516,8 @@ static void vfio_listener_log_sync(MemoryListener *listener, static const MemoryListener vfio_memory_listener = { .name = "vfio", + .begin = vfio_listener_begin, + .commit = vfio_listener_commit, .region_add = vfio_listener_region_add, .region_del = vfio_listener_region_del, .log_global_start = vfio_listener_log_global_start, @@ -2788,7 +2818,7 @@ VFIODeviceIO vfio_dev_io_ioctl = { .region_write = vfio_io_region_write, }; -static int vfio_io_dma_map(VFIOContainer *container, +static int vfio_io_dma_map(VFIOContainer *container, MemoryRegion *mr, struct vfio_iommu_type1_dma_map *map) { @@ -2848,8 +2878,14 @@ static int vfio_io_dirty_bitmap(VFIOContainer *container, return ret < 0 ? -errno : ret; } +static void vfio_io_wait_commit(VFIOContainer *container) +{ + /* ioctl()s are synchronous */ +} + static VFIOContainerIO vfio_cont_io_ioctl = { .dma_map = vfio_io_dma_map, .dma_unmap = vfio_io_dma_unmap, .dirty_bitmap = vfio_io_dirty_bitmap, + .wait_commit = vfio_io_wait_commit, }; diff --git a/hw/vfio/user.c b/hw/vfio/user.c index aebf44c..6dee775 100644 --- a/hw/vfio/user.c +++ b/hw/vfio/user.c @@ -64,8 +64,11 @@ static void vfio_user_request(void *opaque); static int vfio_user_send_queued(VFIOUserProxy *proxy, VFIOUserMsg *msg); static void vfio_user_send_async(VFIOUserProxy *proxy, VFIOUserHdr *hdr, VFIOUserFDs *fds); +static void vfio_user_send_nowait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, + VFIOUserFDs *fds, int rsize); static void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, VFIOUserFDs *fds, int rsize, bool nobql); +static void vfio_user_wait_reqs(VFIOUserProxy *proxy); static void vfio_user_request_msg(VFIOUserHdr *hdr, uint16_t cmd, uint32_t size, uint32_t flags); @@ -664,6 +667,36 @@ static void vfio_user_send_async(VFIOUserProxy *proxy, VFIOUserHdr *hdr, } } +/* + * nowait send - vfio_wait_reqs() can wait for it later + */ +static void vfio_user_send_nowait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, + VFIOUserFDs *fds, int rsize) +{ + VFIOUserMsg *msg; + int ret; + + if (hdr->flags & VFIO_USER_NO_REPLY) { + error_printf("vfio_user_send_nowait on async message\n"); + return; + } + + QEMU_LOCK_GUARD(&proxy->lock); + + msg = vfio_user_getmsg(proxy, hdr, fds); + msg->id = hdr->id; + msg->rsize = rsize ? rsize : hdr->size; + msg->type = VFIO_MSG_NOWAIT; + + ret = vfio_user_send_queued(proxy, msg); + if (ret < 0) { + vfio_user_recycle(proxy, msg); + return; + } + + proxy->last_nowait = msg; +} + static void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, VFIOUserFDs *fds, int rsize, bool nobql) { @@ -717,6 +750,60 @@ static void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, } } +static void vfio_user_wait_reqs(VFIOUserProxy *proxy) +{ + VFIOUserMsg *msg; + bool iolock = false; + + /* + * Any DMA map/unmap requests sent in the middle + * of a memory region transaction were sent nowait. + * Wait for them here. + */ + qemu_mutex_lock(&proxy->lock); + if (proxy->last_nowait != NULL) { + iolock = qemu_mutex_iothread_locked(); + if (iolock) { + qemu_mutex_unlock_iothread(); + } + + /* + * Change type to WAIT to wait for reply + */ + msg = proxy->last_nowait; + msg->type = VFIO_MSG_WAIT; + proxy->last_nowait = NULL; + while (!msg->complete) { + if (!qemu_cond_timedwait(&msg->cv, &proxy->lock, wait_time)) { + VFIOUserMsgQ *list; + + list = msg->pending ? &proxy->pending : &proxy->outgoing; + QTAILQ_REMOVE(list, msg, next); + error_printf("vfio_wait_reqs - timed out\n"); + break; + } + } + + if (msg->hdr->flags & VFIO_USER_ERROR) { + error_printf("vfio_user_wait_reqs - error reply on async "); + error_printf("request: command %x error %s\n", msg->hdr->command, + strerror(msg->hdr->error_reply)); + } + + /* + * Change type back to NOWAIT to free + */ + msg->type = VFIO_MSG_NOWAIT; + vfio_user_recycle(proxy, msg); + } + + /* lock order is BQL->proxy - don't hold proxy when getting BQL */ + qemu_mutex_unlock(&proxy->lock); + if (iolock) { + qemu_mutex_lock_iothread(); + } +} + static QLIST_HEAD(, VFIOUserProxy) vfio_user_sockets = QLIST_HEAD_INITIALIZER(vfio_user_sockets); @@ -1298,6 +1385,107 @@ int vfio_user_validate_version(VFIOUserProxy *proxy, Error **errp) return 0; } +static int vfio_user_dma_map(VFIOUserProxy *proxy, + struct vfio_iommu_type1_dma_map *map, + int fd, bool will_commit) +{ + VFIOUserFDs *fds = NULL; + VFIOUserDMAMap *msgp = g_malloc0(sizeof(*msgp)); + int ret; + + vfio_user_request_msg(&msgp->hdr, VFIO_USER_DMA_MAP, sizeof(*msgp), 0); + msgp->argsz = map->argsz; + msgp->flags = map->flags; + msgp->offset = map->vaddr; + msgp->iova = map->iova; + msgp->size = map->size; + trace_vfio_user_dma_map(msgp->iova, msgp->size, msgp->offset, msgp->flags, + will_commit); + + /* + * The will_commit case sends without blocking or dropping BQL. + * They're later waited for in vfio_send_wait_reqs. + */ + if (will_commit) { + /* can't use auto variable since we don't block */ + if (fd != -1) { + fds = vfio_user_getfds(1); + fds->send_fds = 1; + fds->fds[0] = fd; + } + vfio_user_send_nowait(proxy, &msgp->hdr, fds, 0); + ret = 0; + } else { + VFIOUserFDs local_fds = { 1, 0, &fd }; + + fds = fd != -1 ? &local_fds : NULL; + vfio_user_send_wait(proxy, &msgp->hdr, fds, 0, will_commit); + ret = (msgp->hdr.flags & VFIO_USER_ERROR) ? -msgp->hdr.error_reply : 0; + g_free(msgp); + } + + return ret; +} + +static int vfio_user_dma_unmap(VFIOUserProxy *proxy, + struct vfio_iommu_type1_dma_unmap *unmap, + struct vfio_bitmap *bitmap, bool will_commit) +{ + struct { + VFIOUserDMAUnmap msg; + VFIOUserBitmap bitmap; + } *msgp = NULL; + int msize, rsize; + bool blocking = !will_commit; + + if (bitmap == NULL && + (unmap->flags & VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP)) { + error_printf("vfio_user_dma_unmap mismatched flags and bitmap\n"); + return -EINVAL; + } + + /* + * If a dirty bitmap is returned, allocate extra space for it + * and block for reply even in the will_commit case. + * Otherwise, can send the unmap request without waiting. + */ + if (bitmap != NULL) { + blocking = true; + msize = sizeof(*msgp); + rsize = msize + bitmap->size; + msgp = g_malloc0(rsize); + msgp->bitmap.pgsize = bitmap->pgsize; + msgp->bitmap.size = bitmap->size; + } else { + msize = rsize = sizeof(VFIOUserDMAUnmap); + msgp = g_malloc0(rsize); + } + + vfio_user_request_msg(&msgp->msg.hdr, VFIO_USER_DMA_UNMAP, msize, 0); + msgp->msg.argsz = rsize - sizeof(VFIOUserHdr); + msgp->msg.argsz = unmap->argsz; + msgp->msg.flags = unmap->flags; + msgp->msg.iova = unmap->iova; + msgp->msg.size = unmap->size; + trace_vfio_user_dma_unmap(msgp->msg.iova, msgp->msg.size, msgp->msg.flags, + bitmap != NULL, will_commit); + + if (blocking) { + vfio_user_send_wait(proxy, &msgp->msg.hdr, NULL, rsize, will_commit); + if (msgp->msg.hdr.flags & VFIO_USER_ERROR) { + return -msgp->msg.hdr.error_reply; + } + if (bitmap != NULL) { + memcpy(bitmap->data, &msgp->bitmap.data, bitmap->size); + } + g_free(msgp); + } else { + vfio_user_send_nowait(proxy, &msgp->msg.hdr, NULL, rsize); + } + + return 0; +} + static int vfio_user_get_info(VFIOUserProxy *proxy, struct vfio_device_info *info) { @@ -1609,5 +1797,41 @@ VFIODeviceIO vfio_dev_io_sock = { .region_write = vfio_user_io_region_write, }; +static int vfio_user_io_dma_map(VFIOContainer *container, MemoryRegion *mr, + struct vfio_iommu_type1_dma_map *map) +{ + int fd = memory_region_get_fd(mr); + + /* + * map->vaddr enters as a QEMU process address + * make it either a file offset for mapped areas or 0 + */ + if (fd != -1) { + void *addr = (void *)(uintptr_t)map->vaddr; + + map->vaddr = qemu_ram_block_host_offset(mr->ram_block, addr); + } else { + map->vaddr = 0; + } + + return vfio_user_dma_map(container->proxy, map, fd, container->async_ops); +} + +static int vfio_user_io_dma_unmap(VFIOContainer *container, + struct vfio_iommu_type1_dma_unmap *unmap, + struct vfio_bitmap *bitmap) +{ + return vfio_user_dma_unmap(container->proxy, unmap, bitmap, + container->async_ops); +} + +static void vfio_user_io_wait_commit(VFIOContainer *container) +{ + vfio_user_wait_reqs(container->proxy); +} + VFIOContainerIO vfio_cont_io_sock = { + .dma_map = vfio_user_io_dma_map, + .dma_unmap = vfio_user_io_dma_unmap, + .wait_commit = vfio_user_io_wait_commit, }; diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 01563cb..a4e02ff 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -178,3 +178,5 @@ vfio_user_get_region_info(uint32_t index, uint32_t flags, uint64_t size) " index vfio_user_region_rw(uint32_t region, uint64_t off, uint32_t count) " region %d offset 0x%"PRIx64" count %d" vfio_user_get_irq_info(uint32_t index, uint32_t flags, uint32_t count) " index %d flags 0x%x count %d" vfio_user_set_irqs(uint32_t index, uint32_t start, uint32_t count, uint32_t flags) " index %d start %d count %d flags 0x%x" +vfio_user_dma_map(uint64_t iova, uint64_t size, uint64_t off, uint32_t flags, bool will_commit) " iova 0x%"PRIx64" size 0x%"PRIx64" off 0x%"PRIx64" flags 0x%x will_commit %d" +vfio_user_dma_unmap(uint64_t iova, uint64_t size, uint32_t flags, bool dirty, bool will_commit) " iova 0x%"PRIx64" size 0x%"PRIx64" flags 0x%x dirty %d will_commit %d"