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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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11
migration/postcopy-ram.c
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@ -37,6 +37,7 @@
#include "qemu-file.h"
#include "yank_functions.h"
#include "tls.h"
#include "qemu/userfaultfd.h"
/* Arbitrary limit on size of each discard command,
* keeps them around ~200 bytes
@ -226,11 +227,9 @@ static bool receive_ufd_features(uint64_t *features)
int ufd;
bool ret = true;
/* if we are here __NR_userfaultfd should exists */
ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
ufd = uffd_open(O_CLOEXEC);
if (ufd == -1) {
error_report("%s: syscall __NR_userfaultfd failed: %s", __func__,
strerror(errno));
error_report("%s: uffd_open() failed: %s", __func__, strerror(errno));
return false;
}
@ -375,7 +374,7 @@ bool postcopy_ram_supported_by_host(MigrationIncomingState *mis)
goto out;
}
ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
ufd = uffd_open(O_CLOEXEC);
if (ufd == -1) {
error_report("%s: userfaultfd not available: %s", __func__,
strerror(errno));
@ -1160,7 +1159,7 @@ static int postcopy_temp_pages_setup(MigrationIncomingState *mis)
int postcopy_ram_incoming_setup(MigrationIncomingState *mis)
{
/* Open the fd for the kernel to give us userfaults */
mis->userfault_fd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
mis->userfault_fd = uffd_open(O_CLOEXEC | O_NONBLOCK);
if (mis->userfault_fd == -1) {
error_report("%s: Failed to open userfault fd: %s", __func__,
strerror(errno));