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util/userfaultfd: Add uffd_open()

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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>
This commit is contained in:
Peter Xu 2023-02-01 16:10:54 -05:00 • committed by Juan Quintela
parent d9df92925e
commit d5890ea072
4 changed files with 30 additions and 10 deletions
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13
util/userfaultfd.c
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@ -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;