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um: drivers: Add virtio vhost-user driver

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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>
This commit is contained in:
Erel Geron 2019-09-11 14:51:20 +02:00 • committed by Richard Weinberger
parent 851b6cb17c
commit 5d38f32499
11 changed files with 1169 additions and 2 deletions
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44
arch/um/os-Linux/file.c
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@ -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;
}