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| author | Thomas Huth <thuth@redhat.com> | 2019-05-23 18:43:05 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2019-06-04 14:05:38 +0200 |
| commit | da2a2d601c2d95bedf23b896bd409d53c92c04ad (patch) | |
| tree | a77c8680885dc86d1a11cac3e8d5deb1f64019bd /tools/testing/selftests/kvm | |
| parent | fe85ec86fcd5998389274b6e12977bcf8509d3e0 (diff) | |
| download | blackbird-op-linux-da2a2d601c2d95bedf23b896bd409d53c92c04ad.tar.gz blackbird-op-linux-da2a2d601c2d95bedf23b896bd409d53c92c04ad.zip | |
KVM: selftests: Align memory region addresses to 1M on s390x
On s390x, there is a constraint that memory regions have to be aligned
to 1M (or running the VM will fail). Introduce a new "alignment" variable
in the vm_userspace_mem_region_add() function which now can be used for
both, huge page and s390x alignment requirements.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20190523164309.13345-6-thuth@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[prepare for THP as outlined by Andrew Jones]
Diffstat (limited to 'tools/testing/selftests/kvm')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/kvm_util.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 9ea9ba28af1f..ab7fcb9acf3d 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -557,6 +557,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, int ret; struct userspace_mem_region *region; size_t huge_page_size = KVM_UTIL_PGS_PER_HUGEPG * vm->page_size; + size_t alignment; TEST_ASSERT((guest_paddr % vm->page_size) == 0, "Guest physical " "address not on a page boundary.\n" @@ -606,9 +607,20 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, TEST_ASSERT(region != NULL, "Insufficient Memory"); region->mmap_size = npages * vm->page_size; - /* Enough memory to align up to a huge page. */ +#ifdef __s390x__ + /* On s390x, the host address must be aligned to 1M (due to PGSTEs) */ + alignment = 0x100000; +#else + alignment = 1; +#endif + if (src_type == VM_MEM_SRC_ANONYMOUS_THP) - region->mmap_size += huge_page_size; + alignment = max(huge_page_size, alignment); + + /* Add enough memory to align up if necessary */ + if (alignment > 1) + region->mmap_size += alignment; + region->mmap_start = mmap(NULL, region->mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS @@ -618,9 +630,8 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, "test_malloc failed, mmap_start: %p errno: %i", region->mmap_start, errno); - /* Align THP allocation up to start of a huge page. */ - region->host_mem = align(region->mmap_start, - src_type == VM_MEM_SRC_ANONYMOUS_THP ? huge_page_size : 1); + /* Align host address */ + region->host_mem = align(region->mmap_start, alignment); /* As needed perform madvise */ if (src_type == VM_MEM_SRC_ANONYMOUS || src_type == VM_MEM_SRC_ANONYMOUS_THP) { |
