[PATCH v2] KVM: selftests: introduce P47V64 for s390x

[Christian Borntraeger <borntraeger@de.ibm.com>]

s390x can have up to 47bits of physical guest and 64bits of virtual
address  bits. Add a new address mode to avoid errors of testcases
going beyond 47bits.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
v1->v2:
- remove wrong comment
- use 5 levels of page tables
 tools/testing/selftests/kvm/include/kvm_util.h | 3 ++-
 tools/testing/selftests/kvm/lib/kvm_util.c     | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index fcd8e3855111..b602552b1ed0 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -43,6 +43,7 @@ enum vm_guest_mode {
 	VM_MODE_P40V48_4K,
 	VM_MODE_P40V48_64K,
 	VM_MODE_PXXV48_4K,	/* For 48bits VA but ANY bits PA */
+	VM_MODE_P47V64_4K,
 	NUM_VM_MODES,
 };
 
@@ -60,7 +61,7 @@ enum vm_guest_mode {
 
 #elif defined(__s390x__)
 
-#define VM_MODE_DEFAULT			VM_MODE_P52V48_4K
+#define VM_MODE_DEFAULT			VM_MODE_P47V64_4K
 #define MIN_PAGE_SHIFT			12U
 #define ptes_per_page(page_size)	((page_size) / 16)
 
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 28e528c19d28..b126fab6c4e1 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -175,6 +175,7 @@ const char *vm_guest_mode_string(uint32_t i)
 		[VM_MODE_P40V48_4K]	= "PA-bits:40,  VA-bits:48,  4K pages",
 		[VM_MODE_P40V48_64K]	= "PA-bits:40,  VA-bits:48, 64K pages",
 		[VM_MODE_PXXV48_4K]	= "PA-bits:ANY, VA-bits:48,  4K pages",
+		[VM_MODE_P47V64_4K]	= "PA-bits:47,  VA-bits:64,  4K pages",
 	};
 	_Static_assert(sizeof(strings)/sizeof(char *) == NUM_VM_MODES,
 		       "Missing new mode strings?");
@@ -192,6 +193,7 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = {
 	{ 40, 48,  0x1000, 12 },
 	{ 40, 48, 0x10000, 16 },
 	{  0,  0,  0x1000, 12 },
+	{ 47, 64,  0x1000, 12 },
 };
 _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) == NUM_VM_MODES,
 	       "Missing new mode params?");
@@ -277,6 +279,9 @@ struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
 		TEST_FAIL("VM_MODE_PXXV48_4K not supported on non-x86 platforms");
 #endif
 		break;
+	case VM_MODE_P47V64_4K:
+		vm->pgtable_levels = 5;
+		break;
 	default:
 		TEST_FAIL("Unknown guest mode, mode: 0x%x", mode);
 	}
-- 
2.31.1