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author | Erel Geron <erelx.geron@intel.com> | 2019-09-11 14:51:20 +0200 |
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committer | Richard Weinberger <richard@nod.at> | 2019-09-15 21:37:15 +0200 |
commit | 5d38f324993f49d1226ec81efe045834b46cd85a (patch) | |
tree | c5f412c7bbffa5d9778b13f37563805e69d5bfe6 /arch/um/os-Linux/file.c | |
parent | 851b6cb17c9912bc0cb452e477c04542b01db51b (diff) | |
download | linux-5d38f324993f49d1226ec81efe045834b46cd85a.tar.gz linux-5d38f324993f49d1226ec81efe045834b46cd85a.tar.bz2 linux-5d38f324993f49d1226ec81efe045834b46cd85a.zip |
um: drivers: Add virtio vhost-user driver
This module allows virtio devices to be used over a vhost-user socket.
Signed-off-by: Erel Geron <erelx.geron@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/os-Linux/file.c')
-rw-r--r-- | arch/um/os-Linux/file.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c index f25b110d4e70..91f23035be08 100644 --- a/arch/um/os-Linux/file.c +++ b/arch/um/os-Linux/file.c @@ -15,6 +15,7 @@ #include <sys/sysmacros.h> #include <sys/un.h> #include <sys/types.h> +#include <sys/eventfd.h> #include <os.h> static void copy_stat(struct uml_stat *dst, const struct stat64 *src) @@ -620,3 +621,46 @@ int os_falloc_punch(int fd, unsigned long long offset, int len) return n; } +int os_eventfd(unsigned int initval, int flags) +{ + int fd = eventfd(initval, flags); + + if (fd < 0) + return -errno; + return fd; +} + +int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds, + unsigned int fds_num) +{ + struct iovec iov = { + .iov_base = (void *) buf, + .iov_len = len, + }; + union { + char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)]; + struct cmsghdr align; + } u; + unsigned int fds_size = sizeof(*fds) * fds_num; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = u.control, + .msg_controllen = CMSG_SPACE(fds_size), + }; + struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); + int err; + + if (fds_num > OS_SENDMSG_MAX_FDS) + return -EINVAL; + memset(u.control, 0, sizeof(u.control)); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(fds_size); + memcpy(CMSG_DATA(cmsg), fds, fds_size); + err = sendmsg(fd, &msg, 0); + + if (err < 0) + return -errno; + return err; +} |