[RFC PATCH 1/2] KVM: selftests: Add max vcpus test for ppc64le

[Fabiano Rosas <farosas@linux.ibm.com>]

$ cd tools/selftests/kvm
$ make ARCH=powerpc
$ ulimit -n
4096
$ ./kvm_create_max_vcpus

Note the test currently fails in P9 with:

KVM_CAP_MAX_VCPU_ID: 16384
KVM_CAP_MAX_VCPUS: 2048
Testing creating 2048 vCPUs, with IDs 0...2047.
Testing creating 2048 vCPUs, with IDs 14336...16383.
== Test Assertion Failure ==
  lib/kvm_util.c:983: vcpu->fd >= 0
  pidt066 tidt066 - Invalid argument
     1  0x0000000010002813: vm_vcpu_add at kvm_util.c:982
     2 0x000000001000176f: test_vcpu_creation at
     kvm_create_max_vcpus.c:34 (discriminator 3)
     3  0x00000000100014e7: main at kvm_create_max_vcpus.c:62
     4  0x00007fff89454077: ?? ??:0
     5  0x00007fff89454263: ?? ??:0
  KVM_CREATE_VCPU failed, rc: -1 errno: 22

Signed-off-by Fabiano Rosas <farosas@linux.ibm.com>
---
 tools/testing/selftests/kvm/Makefile          |  7 +++
 .../testing/selftests/kvm/include/kvm_util.h  |  7 +++
 .../selftests/kvm/include/powerpc/processor.h |  7 +++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  5 +++
 .../selftests/kvm/lib/powerpc/processor.c     | 44 +++++++++++++++++++
 5 files changed, 70 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/include/powerpc/processor.h
 create mode 100644 tools/testing/selftests/kvm/lib/powerpc/processor.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 67eebb53235f..f1778b3ed093 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -33,10 +33,15 @@ ifeq ($(ARCH),s390)
 	UNAME_M := s390x
 endif
 
+ifeq ($(ARCH),powerpc)
+	UNAME_M := powerpc
+endif
+
 LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
 LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
 LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c
 LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
+LIBKVM_powerpc = lib/powerpc/processor.c
 
 TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
 TEST_GEN_PROGS_x86_64 += x86_64/get_msr_index_features
@@ -93,6 +98,8 @@ TEST_GEN_PROGS_s390x += dirty_log_test
 TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
 TEST_GEN_PROGS_s390x += set_memory_region_test
 
+TEST_GEN_PROGS_powerpc += kvm_create_max_vcpus
+
 TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
 LIBKVM += $(LIBKVM_$(UNAME_M))
 
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index 0f4258eaa629..d4f6e079592b 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_P51V52_64K,	/* ???: include/asm/book3s/64/pgtable.h says P53 */
 	NUM_VM_MODES,
 };
 
@@ -64,6 +65,12 @@ enum vm_guest_mode {
 #define MIN_PAGE_SHIFT			12U
 #define ptes_per_page(page_size)	((page_size) / 16)
 
+#elif defined(__powerpc__)
+
+#define VM_MODE_DEFAULT			VM_MODE_P51V52_64K
+#define MIN_PAGE_SHIFT			16U
+#define ptes_per_page(page_size)	((page_size) / 8)
+
 #endif
 
 #define MIN_PAGE_SIZE		(1U << MIN_PAGE_SHIFT)
diff --git a/tools/testing/selftests/kvm/include/powerpc/processor.h b/tools/testing/selftests/kvm/include/powerpc/processor.h
new file mode 100644
index 000000000000..c75197b349a8
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/powerpc/processor.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * powerpc processor specific defines
+ */
+#ifndef SELFTEST_KVM_PROCESSOR_H
+#define SELFTEST_KVM_PROCESSOR_H
+#endif
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index b8849a1aca79..2e9dafc03a12 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -151,6 +151,7 @@ const char * const vm_guest_mode_string[] = {
 	"PA-bits:40,  VA-bits:48,  4K pages",
 	"PA-bits:40,  VA-bits:48, 64K pages",
 	"PA-bits:ANY, VA-bits:48,  4K pages",
+	"PA-bits:51,  VA-bits:52, 64K pages",
 };
 _Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) = NUM_VM_MODES,
 	       "Missing new mode strings?");
@@ -163,6 +164,7 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = {
 	{ 40, 48,  0x1000, 12 },
 	{ 40, 48, 0x10000, 16 },
 	{  0,  0,  0x1000, 12 },
+	{ 51, 52, 0x10000, 16 },
 };
 _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) = NUM_VM_MODES,
 	       "Missing new mode params?");
@@ -246,6 +248,9 @@ 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_P51V52_64K:
+		vm->pgtable_levels = 4;
+		break;
 	default:
 		TEST_FAIL("Unknown guest mode, mode: 0x%x", mode);
 	}
diff --git a/tools/testing/selftests/kvm/lib/powerpc/processor.c b/tools/testing/selftests/kvm/lib/powerpc/processor.c
new file mode 100644
index 000000000000..e86b8516863b
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/powerpc/processor.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * powerpc specific code
+ */
+#include "kvm_util.h"
+#include "../kvm_util_internal.h"
+#include "processor.h"
+
+
+void virt_pg_map(struct kvm_vm *vm, uint64_t gva, uint64_t gpa, uint32_t memslot)
+{
+	TEST_FAIL("%s not implemented", __func__);
+}
+
+vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
+{
+	TEST_FAIL("%s not implemented", __func__);
+	return 0;
+}
+
+void virt_pgd_alloc(struct kvm_vm *vm, uint32_t pgd_memslot)
+{
+	TEST_FAIL("%s not implemented", __func__);
+}
+
+void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
+{
+	TEST_FAIL("%s not implemented", __func__);
+}
+
+void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
+{
+	TEST_FAIL("%s not implemented", __func__);
+}
+
+void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
+{
+	TEST_FAIL("%s not implemented", __func__);
+}
+
+void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	TEST_ASSERT(false, "Unhandled exception");
+}
-- 
2.29.2