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authorErel Geron <erelx.geron@intel.com>2019-09-11 14:51:20 +0200
committerRichard Weinberger <richard@nod.at>2019-09-15 21:37:15 +0200
commit5d38f324993f49d1226ec81efe045834b46cd85a (patch)
treec5f412c7bbffa5d9778b13f37563805e69d5bfe6 /arch/um/os-Linux
parent851b6cb17c9912bc0cb452e477c04542b01db51b (diff)
downloadlinux-5d38f324993f49d1226ec81efe045834b46cd85a.tar.bz2
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')
-rw-r--r--arch/um/os-Linux/file.c44
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;
+}