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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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4
tests/qtest/migration-test.c
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@ -61,14 +61,14 @@ static bool uffd_feature_thread_id;
#if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <linux/userfaultfd.h>
#include "qemu/userfaultfd.h"
static bool ufd_version_check(void)
{
struct uffdio_api api_struct;
uint64_t ioctl_mask;
int ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
int ufd = uffd_open(O_CLOEXEC);
if (ufd == -1) {
g_test_message("Skipping test: userfaultfd not available");