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| author | Peter Xu <peterx@redhat.com> | 2023-02-01 16:10:54 -0500 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2023-02-06 19:22:56 +0100 |
| commit | d5890ea0722831eea76a0efd23a496b3e8815fe8 (patch) | |
| tree | c9d365c7db03036f2928100155bb8d77ccad6bee /util/userfaultfd.c | |
| parent | d9df92925ef2b7ca8774ef44b0e1f859a91d4cd6 (diff) | |
| download | qemu-d5890ea0722831eea76a0efd23a496b3e8815fe8.zip qemu-d5890ea0722831eea76a0efd23a496b3e8815fe8.tar.gz qemu-d5890ea0722831eea76a0efd23a496b3e8815fe8.tar.bz2 | |
util/userfaultfd: Add uffd_open()
Add a helper to create the uffd handle.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'util/userfaultfd.c')
| -rw-r--r-- | util/userfaultfd.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/util/userfaultfd.c b/util/userfaultfd.c index f1cd6af..4953b31 100644 --- a/util/userfaultfd.c +++ b/util/userfaultfd.c @@ -19,6 +19,15 @@ #include <sys/syscall.h> #include <sys/ioctl.h> +int uffd_open(int flags) +{ +#if defined(__NR_userfaultfd) + return syscall(__NR_userfaultfd, flags); +#else + return -EINVAL; +#endif +} + /** * uffd_query_features: query UFFD features * @@ -32,7 +41,7 @@ int uffd_query_features(uint64_t *features) struct uffdio_api api_struct = { 0 }; int ret = -1; - uffd_fd = syscall(__NR_userfaultfd, O_CLOEXEC); + uffd_fd = uffd_open(O_CLOEXEC); if (uffd_fd < 0) { trace_uffd_query_features_nosys(errno); return -1; @@ -69,7 +78,7 @@ int uffd_create_fd(uint64_t features, bool non_blocking) uint64_t ioctl_mask = BIT(_UFFDIO_REGISTER) | BIT(_UFFDIO_UNREGISTER); flags = O_CLOEXEC | (non_blocking ? O_NONBLOCK : 0); - uffd_fd = syscall(__NR_userfaultfd, flags); + uffd_fd = uffd_open(flags); if (uffd_fd < 0) { trace_uffd_create_fd_nosys(errno); return -1; |