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userfaultfd: selftest: test UFFDIO_ZEROPAGE on all memory types 

This will verify -EINVAL is returned with hugetlbfs/shmem and it'll do a
functional test of UFFDIO_ZEROPAGE on anonymous memory.

Link: http://lkml.kernel.org/r/20161216144821.5183-42-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Michael Rapoport <RAPOPORT@il.ibm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2017-02-22 15:44:10 -08:00 committed by Linus Torvalds
parent da5502c0a3
commit 7a0c4cf85b
1 changed files with 81 additions and 1 deletions
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82
tools/testing/selftests/vm/userfaultfd.c
View File

@ -625,6 +625,86 @@ static int faulting_process(void)
return 0;
}
static int uffdio_zeropage(int ufd, unsigned long offset)
{
struct uffdio_zeropage uffdio_zeropage;
int ret;
unsigned long has_zeropage = EXPECTED_IOCTLS & (1 << _UFFDIO_ZEROPAGE);
if (offset >= nr_pages * page_size)
fprintf(stderr, "unexpected offset %lu\n",
offset), exit(1);
uffdio_zeropage.range.start = (unsigned long) area_dst + offset;
uffdio_zeropage.range.len = page_size;
uffdio_zeropage.mode = 0;
ret = ioctl(ufd, UFFDIO_ZEROPAGE, &uffdio_zeropage);
if (ret) {
/* real retval in ufdio_zeropage.zeropage */
if (has_zeropage) {
if (uffdio_zeropage.zeropage == -EEXIST)
fprintf(stderr, "UFFDIO_ZEROPAGE -EEXIST\n"),
exit(1);
else
fprintf(stderr, "UFFDIO_ZEROPAGE error %Ld\n",
uffdio_zeropage.zeropage), exit(1);
} else {
if (uffdio_zeropage.zeropage != -EINVAL)
fprintf(stderr,
"UFFDIO_ZEROPAGE not -EINVAL %Ld\n",
uffdio_zeropage.zeropage), exit(1);
}
} else if (has_zeropage) {
if (uffdio_zeropage.zeropage != page_size) {
fprintf(stderr, "UFFDIO_ZEROPAGE unexpected %Ld\n",
uffdio_zeropage.zeropage), exit(1);
} else
return 1;
} else {
fprintf(stderr,
"UFFDIO_ZEROPAGE succeeded %Ld\n",
uffdio_zeropage.zeropage), exit(1);
}
return 0;
}
/* exercise UFFDIO_ZEROPAGE */
static int userfaultfd_zeropage_test(void)
{
struct uffdio_register uffdio_register;
unsigned long expected_ioctls;
printf("testing UFFDIO_ZEROPAGE: ");
fflush(stdout);
if (release_pages(area_dst))
return 1;
if (userfaultfd_open(0) < 0)
return 1;
uffdio_register.range.start = (unsigned long) area_dst;
uffdio_register.range.len = nr_pages * page_size;
uffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING;
if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))
fprintf(stderr, "register failure\n"), exit(1);
expected_ioctls = EXPECTED_IOCTLS;
if ((uffdio_register.ioctls & expected_ioctls) !=
expected_ioctls)
fprintf(stderr,
"unexpected missing ioctl for anon memory\n"),
exit(1);
if (uffdio_zeropage(uffd, 0)) {
if (my_bcmp(area_dst, zeropage, page_size))
fprintf(stderr, "zeropage is not zero\n"), exit(1);
}
close(uffd);
printf("done.\n");
return 0;
}
static int userfaultfd_events_test(void)
{
struct uffdio_register uffdio_register;
@ -853,7 +933,7 @@ static int userfaultfd_stress(void)
return err;
close(uffd);
return userfaultfd_events_test();
return userfaultfd_zeropage_test() || userfaultfd_events_test();
}
#ifndef HUGETLB_TEST