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bh=iNzMYMma9BmiNHsoGKqBx/7LZMqn2DePQZYu1UsVyUo=; b=ePdFY3ZlSfJqgS4kkzjJQrnw+iX4FpBFPAokn+i+UXMTM+hXa+7psKMpsQQg+jaO5Qql6z /RKEp2nOipRzeijUzO1IdOc1LhLjKyGLSYZiOWik3zkME7w6yVWT7SYAozBYowcqrLAXom Q/Vj6tgrJn+wB0mLxB+aBUgb1Wa1IKQ= X-MC-Unique: n0I18hqQPoGOBzj3UYhKuQ-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, vgoyal@redhat.com, stefanha@redhat.com, virtio-fs@redhat.com, marcandre.lureau@redhat.com, mst@redhat.com Subject: [PATCH 16/24] DAX/unmap: virtiofsd: Add VHOST_USER_SLAVE_FS_IO Date: Tue, 9 Feb 2021 19:02:16 +0000 Message-Id: <20210209190224.62827-17-dgilbert@redhat.com> In-Reply-To: <20210209190224.62827-1-dgilbert@redhat.com> References: <20210209190224.62827-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.57, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: "Dr. David Alan Gilbert" Define a new slave command 'VHOST_USER_SLAVE_FS_IO' for a client to ask qemu to perform a read/write from an fd directly to GPA. Signed-off-by: Dr. David Alan Gilbert --- docs/interop/vhost-user.rst | 11 +++ hw/virtio/trace-events | 6 ++ hw/virtio/vhost-user-fs.c | 84 +++++++++++++++++++++++ hw/virtio/vhost-user.c | 4 ++ include/hw/virtio/vhost-user-fs.h | 2 + subprojects/libvhost-user/libvhost-user.h | 1 + 6 files changed, 108 insertions(+) diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 1deedd3407..821712f4a2 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -1452,6 +1452,17 @@ Slave message types multiple chunks can be unmapped in one command. A reply is generated indicating whether unmapping succeeded. =20 +``VHOST_USER_SLAVE_FS_IO`` + :id: 9 + :equivalent ioctl: N/A + :slave payload: fd + n * (offset + address + len) + :master payload: N/A + + Requests that the QEMU performs IO directly from an fd to guest memory + on behalf of the daemon; this is normally for a case where a memory regi= on + isn't visible to the daemon. slave payload has flags which determine + the direction of IO operation. + .. _reply_ack: =20 VHOST_USER_PROTOCOL_F_REPLY_ACK diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index c62727f879..20557a078e 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -53,6 +53,12 @@ vhost_vdpa_get_features(void *dev, uint64_t features) "d= ev: %p features: 0x%"PRI vhost_vdpa_set_owner(void *dev) "dev: %p" vhost_vdpa_vq_get_addr(void *dev, void *vq, uint64_t desc_user_addr, uint6= 4_t avail_user_addr, uint64_t used_user_addr) "dev: %p vq: %p desc_user_add= r: 0x%"PRIx64" avail_user_addr: 0x%"PRIx64" used_user_addr: 0x%"PRIx64 =20 +# vhost-user-fs.c + +vhost_user_fs_slave_io_loop(const char *name, uint64_t owr, int is_ram, in= t is_romd, size_t size) "region %s with internal offset 0x%"PRIx64 " ram=3D= %d romd=3D%d mrs.size=3D%zd" +vhost_user_fs_slave_io_loop_res(ssize_t transferred) "%zd" +vhost_user_fs_slave_io_exit(int res, size_t done) "res: %d done: %zd" + # virtio.c virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned o= ut_num) "elem %p size %zd in_num %u out_num %u" virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int = idx) "vq %p elem %p len %u idx %u" diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c index 5f2fca4d82..357bc1d04e 100644 --- a/hw/virtio/vhost-user-fs.c +++ b/hw/virtio/vhost-user-fs.c @@ -23,6 +23,8 @@ #include "hw/virtio/vhost-user-fs.h" #include "monitor/monitor.h" #include "sysemu/sysemu.h" +#include "exec/address-spaces.h" +#include "trace.h" =20 /* * The powerpc kernel code expects the memory to be accessible during @@ -155,6 +157,88 @@ uint64_t vhost_user_fs_slave_unmap(struct vhost_dev *d= ev, return (uint64_t)res; } =20 +uint64_t vhost_user_fs_slave_io(struct vhost_dev *dev, VhostUserFSSlaveMsg= *sm, + int fd) +{ + VHostUserFS *fs =3D VHOST_USER_FS(dev->vdev); + if (!fs) { + /* Shouldn't happen - but seen it in error paths */ + error_report("Bad fs ptr"); + return (uint64_t)-1; + } + + unsigned int i; + int res =3D 0; + size_t done =3D 0; + + if (fd < 0) { + error_report("Bad fd for map"); + return (uint64_t)-1; + } + + for (i =3D 0; i < VHOST_USER_FS_SLAVE_ENTRIES && !res; i++) { + if (sm->len[i] =3D=3D 0) { + continue; + } + + size_t len =3D sm->len[i]; + hwaddr gpa =3D sm->c_offset[i]; + + while (len && !res) { + MemoryRegionSection mrs =3D memory_region_find(get_system_memo= ry(), + gpa, len); + size_t mrs_size =3D (size_t)int128_get64(mrs.size); + + if (!mrs_size) { + error_report("No guest region found for 0x%" HWADDR_PRIx, = gpa); + res =3D -EFAULT; + break; + } + + trace_vhost_user_fs_slave_io_loop(mrs.mr->name, + (uint64_t)mrs.offset_within_regi= on, + memory_region_is_ram(mrs.mr), + memory_region_is_romd(mrs.mr), + (size_t)mrs_size); + + void *hostptr =3D qemu_map_ram_ptr(mrs.mr->ram_block, + mrs.offset_within_region); + ssize_t transferred; + if (sm->flags[i] & VHOST_USER_FS_FLAG_MAP_R) { + /* Read from file into RAM */ + if (mrs.mr->readonly) { + res =3D -EFAULT; + break; + } + transferred =3D pread(fd, hostptr, mrs_size, sm->fd_offset= [i]); + } else { + /* Write into file from RAM */ + assert((sm->flags[i] & VHOST_USER_FS_FLAG_MAP_W)); + transferred =3D pwrite(fd, hostptr, mrs_size, sm->fd_offse= t[i]); + } + trace_vhost_user_fs_slave_io_loop_res(transferred); + if (transferred < 0) { + res =3D -errno; + break; + } + if (!transferred) { + /* EOF */ + break; + } + + done +=3D transferred; + len -=3D transferred; + } + } + close(fd); + + trace_vhost_user_fs_slave_io_exit(res, done); + if (res < 0) { + return (uint64_t)res; + } + return (uint64_t)done; +} + static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) { VHostUserFS *fs =3D VHOST_USER_FS(vdev); diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 21e40ff91a..0bc83c2714 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -137,6 +137,7 @@ typedef enum VhostUserSlaveRequest { VHOST_USER_SLAVE_VRING_ERR =3D 5, VHOST_USER_SLAVE_FS_MAP =3D 6, VHOST_USER_SLAVE_FS_UNMAP =3D 7, + VHOST_USER_SLAVE_FS_IO =3D 8, VHOST_USER_SLAVE_MAX } VhostUserSlaveRequest; =20 @@ -1485,6 +1486,9 @@ static void slave_read(void *opaque) case VHOST_USER_SLAVE_FS_UNMAP: ret =3D vhost_user_fs_slave_unmap(dev, &payload.fs); break; + case VHOST_USER_SLAVE_FS_IO: + ret =3D vhost_user_fs_slave_io(dev, &payload.fs, fd[0]); + break; #endif default: error_report("Received unexpected msg type: %d.", hdr.request); diff --git a/include/hw/virtio/vhost-user-fs.h b/include/hw/virtio/vhost-us= er-fs.h index 25e14ab17a..ffd3165c29 100644 --- a/include/hw/virtio/vhost-user-fs.h +++ b/include/hw/virtio/vhost-user-fs.h @@ -69,5 +69,7 @@ uint64_t vhost_user_fs_slave_map(struct vhost_dev *dev, V= hostUserFSSlaveMsg *sm, int fd); uint64_t vhost_user_fs_slave_unmap(struct vhost_dev *dev, VhostUserFSSlaveMsg *sm); +uint64_t vhost_user_fs_slave_io(struct vhost_dev *dev, VhostUserFSSlaveMsg= *sm, + int fd); =20 #endif /* _QEMU_VHOST_USER_FS_H */ diff --git a/subprojects/libvhost-user/libvhost-user.h b/subprojects/libvho= st-user/libvhost-user.h index 150b1121cc..a398148ed9 100644 --- a/subprojects/libvhost-user/libvhost-user.h +++ b/subprojects/libvhost-user/libvhost-user.h @@ -121,6 +121,7 @@ typedef enum VhostUserSlaveRequest { VHOST_USER_SLAVE_VRING_ERR =3D 5, VHOST_USER_SLAVE_FS_MAP =3D 6, VHOST_USER_SLAVE_FS_UNMAP =3D 7, + VHOST_USER_SLAVE_FS_IO =3D 8, VHOST_USER_SLAVE_MAX } VhostUserSlaveRequest; =20 --=20 2.29.2