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charset="UTF-8" This patch adds tests for allocation and conversion of subfolios in a large folio. Change-Id: I37035b2c24398e2c83a2ac5a46b4e6ceed2a8b53 Signed-off-by: Ackerley Tng --- .../kvm/guest_memfd_conversions_test.c | 88 +++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c index 435f91424d5f..c31d1abd1b93 100644 --- a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c @@ -672,6 +672,92 @@ static void test_close_with_pinning(size_t test_page_size) __test_close_with_pinning(test_page_size, false); } +static void test_allocate_subfolios(size_t test_page_size) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + size_t increment; + int guest_memfd; + size_t nr_pages; + char *mem; + int i; + + if (test_page_size == PAGE_SIZE) + return; + + vm = setup_test(test_page_size, /*init_private=*/false, &vcpu, + &guest_memfd, &mem); + + nr_pages = test_page_size / PAGE_SIZE; + + /* + * Loop backwards to check allocation of the correct subfolio within the + * huge folio. If it were allocated wrongly, the second loop would error + * out because one or more of the checks would be wrong. + */ + increment = nr_pages >> 1; + for (i = nr_pages - 1; i >= 0; i -= increment) + host_use_memory(mem + i * PAGE_SIZE, 'X', 'A' + i); + for (i = nr_pages - 1; i >= 0; i -= increment) + host_use_memory(mem + i * PAGE_SIZE, 'A' + i, 'A' + i); + + cleanup_test(test_page_size, vm, guest_memfd, mem); +} + +static void test_convert_subfolios(size_t test_page_size) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + size_t increment; + int guest_memfd; + size_t nr_pages; + int to_convert; + char *mem; + int i; + + if (test_page_size == PAGE_SIZE) + return; + + vm = setup_test(test_page_size, /*init_private=*/true, &vcpu, + &guest_memfd, &mem); + + nr_pages = test_page_size / PAGE_SIZE; + + increment = nr_pages >> 1; + for (i = 0; i < nr_pages; i += increment) { + guest_use_memory(vcpu, + GUEST_MEMFD_SHARING_TEST_GVA + i * PAGE_SIZE, + 'X', 'A', 0); + assert_host_cannot_fault(mem + i * PAGE_SIZE); + } + + to_convert = round_up(nr_pages / 2, increment); + guest_memfd_convert_shared(guest_memfd, to_convert * PAGE_SIZE, PAGE_SIZE); + + + for (i = 0; i < nr_pages; i += increment) { + if (i == to_convert) + host_use_memory(mem + i * PAGE_SIZE, 'A', 'B'); + else + assert_host_cannot_fault(mem + i * PAGE_SIZE); + + guest_use_memory(vcpu, + GUEST_MEMFD_SHARING_TEST_GVA + i * PAGE_SIZE, + 'X', 'B', 0); + } + + guest_memfd_convert_private(guest_memfd, to_convert * PAGE_SIZE, PAGE_SIZE); + + for (i = 0; i < nr_pages; i += increment) { + guest_use_memory(vcpu, + GUEST_MEMFD_SHARING_TEST_GVA + i * PAGE_SIZE, + 'B', 'C', 0); + assert_host_cannot_fault(mem + i * PAGE_SIZE); + } + + cleanup_test(test_page_size, vm, guest_memfd, mem); +} + static void test_with_size(size_t test_page_size) { test_sharing(test_page_size); @@ -685,6 +771,8 @@ static void test_with_size(size_t test_page_size) test_truncate_shared_while_pinned(test_page_size); test_truncate_private(test_page_size); test_close_with_pinning(test_page_size); + test_allocate_subfolios(test_page_size); + test_convert_subfolios(test_page_size); } int main(int argc, char *argv[]) -- 2.49.0.1045.g170613ef41-goog