mm/migrate: add migrate-shared test for migrate_vma_*()

Add a migrate_vma_*() self test for mmap(MAP_SHARED) to verify that
!vma_anonymous() ranges won't be migrated.

Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: "Bharata B Rao" <bharata@linux.ibm.com>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/20200710194840.7602-3-rcampbell@nvidia.com
Link: http://lkml.kernel.org/r/20200709165711.26584-3-rcampbell@nvidia.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c
index 91d38a2..93fc5ca 100644 (file)
--- a/tools/testing/selftests/vm/hmm-tests.c
+++ b/tools/testing/selftests/vm/hmm-tests.c
@@ -942,6 +942,41 @@ TEST_F(hmm, migrate_fault)
 }
 
 /*
+ * Migrate anonymous shared memory to device private memory.
+ */
+TEST_F(hmm, migrate_shared)
+{
+       struct hmm_buffer *buffer;
+       unsigned long npages;
+       unsigned long size;
+       int ret;
+
+       npages = ALIGN(HMM_BUFFER_SIZE, self->page_size) >> self->page_shift;
+       ASSERT_NE(npages, 0);
+       size = npages << self->page_shift;
+
+       buffer = malloc(sizeof(*buffer));
+       ASSERT_NE(buffer, NULL);
+
+       buffer->fd = -1;
+       buffer->size = size;
+       buffer->mirror = malloc(size);
+       ASSERT_NE(buffer->mirror, NULL);
+
+       buffer->ptr = mmap(NULL, size,
+                          PROT_READ | PROT_WRITE,
+                          MAP_SHARED | MAP_ANONYMOUS,
+                          buffer->fd, 0);
+       ASSERT_NE(buffer->ptr, MAP_FAILED);
+
+       /* Migrate memory to device. */
+       ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer, npages);
+       ASSERT_EQ(ret, -ENOENT);
+
+       hmm_buffer_free(buffer);
+}
+
+/*
  * Try to migrate various memory types to device private memory.
  */
 TEST_F(hmm2, migrate_mixed)