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Date:   Fri, 23 Dec 2022 00:13:50 +0000
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, shuah@...nel.org, yang.zhong@...el.com,
        drjones@...hat.com, ricarkol@...gle.com, aaronlewis@...gle.com,
        wei.w.wang@...el.com, kirill.shutemov@...ux.intel.com,
        corbet@....net, hughd@...gle.com, jlayton@...nel.org,
        bfields@...ldses.org, akpm@...ux-foundation.org,
        chao.p.peng@...ux.intel.com, yu.c.zhang@...ux.intel.com,
        jun.nakajima@...el.com, dave.hansen@...el.com,
        michael.roth@....com, qperret@...gle.com, steven.price@....com,
        ak@...ux.intel.com, david@...hat.com, luto@...nel.org,
        vbabka@...e.cz, marcorr@...gle.com, erdemaktas@...gle.com,
        pgonda@...gle.com, nikunj@....com, seanjc@...gle.com,
        diviness@...gle.com, maz@...nel.org, dmatlack@...gle.com,
        axelrasmussen@...gle.com, maciej.szmigiero@...cle.com,
        mizhang@...gle.com, bgardon@...gle.com, ackerleytng@...gle.com,
        Vishal Annapurve <vannapurve@...gle.com>
Subject: [V3 PATCH 6/8] KVM: selftests: Refactor private_mem_test

Move most of the logic from private mem test to a library to allow
possible sharing of private_mem_test logic amongst non-confidential and
confidential VM selftests.

Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
---
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../include/x86_64/private_mem_test_helper.h  |  15 ++
 .../kvm/lib/x86_64/private_mem_test_helper.c  | 197 ++++++++++++++++++
 .../selftests/kvm/x86_64/private_mem_test.c   | 187 +----------------
 4 files changed, 214 insertions(+), 186 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/include/x86_64/private_mem_test_helper.h
 create mode 100644 tools/testing/selftests/kvm/lib/x86_64/private_mem_test_helper.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index ee8c3aebee80..83c649c9de23 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -56,6 +56,7 @@ LIBKVM_x86_64 += lib/x86_64/handlers.S
 LIBKVM_x86_64 += lib/x86_64/hyperv.c
 LIBKVM_x86_64 += lib/x86_64/memstress.c
 LIBKVM_x86_64 += lib/x86_64/private_mem.c
+LIBKVM_x86_64 += lib/x86_64/private_mem_test_helper.c
 LIBKVM_x86_64 += lib/x86_64/processor.c
 LIBKVM_x86_64 += lib/x86_64/svm.c
 LIBKVM_x86_64 += lib/x86_64/ucall.c
diff --git a/tools/testing/selftests/kvm/include/x86_64/private_mem_test_helper.h b/tools/testing/selftests/kvm/include/x86_64/private_mem_test_helper.h
new file mode 100644
index 000000000000..4d32c025876c
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/x86_64/private_mem_test_helper.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2022, Google LLC.
+ */
+
+#ifndef SELFTEST_KVM_PRIVATE_MEM_TEST_HELPER_H
+#define SELFTEST_KVM_PRIVATE_MEM_TEST_HELPER_H
+
+#include <stdint.h>
+#include <kvm_util.h>
+
+void execute_vm_with_private_test_mem(
+			enum vm_mem_backing_src_type test_mem_src);
+
+#endif /* SELFTEST_KVM_PRIVATE_MEM_TEST_HELPER_H */
diff --git a/tools/testing/selftests/kvm/lib/x86_64/private_mem_test_helper.c b/tools/testing/selftests/kvm/lib/x86_64/private_mem_test_helper.c
new file mode 100644
index 000000000000..600bd21d1bb8
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/x86_64/private_mem_test_helper.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022, Google LLC.
+ */
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <limits.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/kvm_para.h>
+#include <linux/memfd.h>
+
+#include <test_util.h>
+#include <kvm_util.h>
+#include <private_mem.h>
+#include <private_mem_test_helper.h>
+#include <processor.h>
+
+#define TEST_AREA_SLOT		10
+#define TEST_AREA_GPA		0xC0000000
+#define TEST_AREA_SIZE		(2 * 1024 * 1024)
+#define GUEST_TEST_MEM_OFFSET	(1 * 1024 * 1024)
+#define GUEST_TEST_MEM_SIZE	(10 * 4096)
+
+#define VM_STAGE_PROCESSED(x)	pr_info("Processed stage %s\n", #x)
+
+#define TEST_MEM_DATA_PATTERN1	0x66
+#define TEST_MEM_DATA_PATTERN2	0x99
+#define TEST_MEM_DATA_PATTERN3	0x33
+#define TEST_MEM_DATA_PATTERN4	0xaa
+#define TEST_MEM_DATA_PATTERN5	0x12
+
+static bool verify_mem_contents(void *mem, uint32_t size, uint8_t pattern)
+{
+	uint8_t *buf = (uint8_t *)mem;
+
+	for (uint32_t i = 0; i < size; i++) {
+		if (buf[i] != pattern)
+			return false;
+	}
+
+	return true;
+}
+
+static void populate_test_area(void *test_area_base, uint64_t pattern)
+{
+	memset(test_area_base, pattern, TEST_AREA_SIZE);
+}
+
+static void populate_guest_test_mem(void *guest_test_mem, uint64_t pattern)
+{
+	memset(guest_test_mem, pattern, GUEST_TEST_MEM_SIZE);
+}
+
+static bool verify_test_area(void *test_area_base, uint64_t area_pattern,
+	uint64_t guest_pattern)
+{
+	void *guest_test_mem = test_area_base + GUEST_TEST_MEM_OFFSET;
+	void *test_area2_base = guest_test_mem + GUEST_TEST_MEM_SIZE;
+	uint64_t test_area2_size = (TEST_AREA_SIZE - (GUEST_TEST_MEM_OFFSET +
+			GUEST_TEST_MEM_SIZE));
+
+	return (verify_mem_contents(test_area_base, GUEST_TEST_MEM_OFFSET, area_pattern) &&
+		verify_mem_contents(guest_test_mem, GUEST_TEST_MEM_SIZE, guest_pattern) &&
+		verify_mem_contents(test_area2_base, test_area2_size, area_pattern));
+}
+
+#define GUEST_STARTED			0
+#define GUEST_PRIVATE_MEM_POPULATED	1
+#define GUEST_SHARED_MEM_POPULATED	2
+#define GUEST_PRIVATE_MEM_POPULATED2	3
+
+/*
+ * Run memory conversion tests with explicit conversion:
+ * Execute KVM hypercall to map/unmap gpa range which will cause userspace exit
+ * to back/unback private memory. Subsequent accesses by guest to the gpa range
+ * will not cause exit to userspace.
+ *
+ * Test memory conversion scenarios with following steps:
+ * 1) Access private memory using private access and verify that memory contents
+ *   are not visible to userspace.
+ * 2) Convert memory to shared using explicit conversions and ensure that
+ *   userspace is able to access the shared regions.
+ * 3) Convert memory back to private using explicit conversions and ensure that
+ *   userspace is again not able to access converted private regions.
+ */
+static void guest_conv_test_fn(void)
+{
+	void *test_area_base = (void *)TEST_AREA_GPA;
+	void *guest_test_mem = (void *)(TEST_AREA_GPA + GUEST_TEST_MEM_OFFSET);
+	uint64_t guest_test_size = GUEST_TEST_MEM_SIZE;
+
+	GUEST_SYNC(GUEST_STARTED);
+
+	populate_test_area(test_area_base, TEST_MEM_DATA_PATTERN1);
+	GUEST_SYNC(GUEST_PRIVATE_MEM_POPULATED);
+	GUEST_ASSERT(verify_test_area(test_area_base, TEST_MEM_DATA_PATTERN1,
+		TEST_MEM_DATA_PATTERN1));
+
+	kvm_hypercall_map_shared((uint64_t)guest_test_mem, guest_test_size);
+
+	populate_guest_test_mem(guest_test_mem, TEST_MEM_DATA_PATTERN2);
+
+	GUEST_SYNC(GUEST_SHARED_MEM_POPULATED);
+	GUEST_ASSERT(verify_test_area(test_area_base, TEST_MEM_DATA_PATTERN1,
+		TEST_MEM_DATA_PATTERN5));
+
+	kvm_hypercall_map_private((uint64_t)guest_test_mem, guest_test_size);
+
+	populate_guest_test_mem(guest_test_mem, TEST_MEM_DATA_PATTERN3);
+	GUEST_SYNC(GUEST_PRIVATE_MEM_POPULATED2);
+
+	GUEST_ASSERT(verify_test_area(test_area_base, TEST_MEM_DATA_PATTERN1,
+		TEST_MEM_DATA_PATTERN3));
+	GUEST_DONE();
+}
+
+#define ASSERT_CONV_TEST_EXIT_IO(vcpu, stage) \
+	{ \
+		struct ucall uc; \
+		ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_IO); \
+		ASSERT_EQ(get_ucall(vcpu, &uc), UCALL_SYNC); \
+		ASSERT_EQ(uc.args[1], stage); \
+	}
+
+#define ASSERT_GUEST_DONE(vcpu) \
+	{ \
+		struct ucall uc; \
+		ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_IO); \
+		ASSERT_EQ(get_ucall(vcpu, &uc), UCALL_DONE); \
+	}
+
+static void host_conv_test_fn(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
+{
+	void *test_area_hva = addr_gpa2hva(vm, TEST_AREA_GPA);
+	void *guest_test_mem_hva = (test_area_hva + GUEST_TEST_MEM_OFFSET);
+
+	vcpu_run_and_handle_mapgpa(vm, vcpu);
+	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_STARTED);
+	populate_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4);
+	VM_STAGE_PROCESSED(GUEST_STARTED);
+
+	vcpu_run_and_handle_mapgpa(vm, vcpu);
+	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_PRIVATE_MEM_POPULATED);
+	TEST_ASSERT(verify_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4,
+			TEST_MEM_DATA_PATTERN4), "failed");
+	VM_STAGE_PROCESSED(GUEST_PRIVATE_MEM_POPULATED);
+
+	vcpu_run_and_handle_mapgpa(vm, vcpu);
+	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_SHARED_MEM_POPULATED);
+	TEST_ASSERT(verify_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4,
+			TEST_MEM_DATA_PATTERN2), "failed");
+	populate_guest_test_mem(guest_test_mem_hva, TEST_MEM_DATA_PATTERN5);
+	VM_STAGE_PROCESSED(GUEST_SHARED_MEM_POPULATED);
+
+	vcpu_run_and_handle_mapgpa(vm, vcpu);
+	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_PRIVATE_MEM_POPULATED2);
+	TEST_ASSERT(verify_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4,
+			TEST_MEM_DATA_PATTERN5), "failed");
+	VM_STAGE_PROCESSED(GUEST_PRIVATE_MEM_POPULATED2);
+
+	vcpu_run_and_handle_mapgpa(vm, vcpu);
+	ASSERT_GUEST_DONE(vcpu);
+}
+
+void execute_vm_with_private_test_mem(
+			enum vm_mem_backing_src_type test_mem_src)
+{
+	struct kvm_vm *vm;
+	struct kvm_enable_cap cap;
+	struct kvm_vcpu *vcpu;
+
+	vm = vm_create_with_one_vcpu(&vcpu, guest_conv_test_fn);
+
+	vm_check_cap(vm, KVM_CAP_EXIT_HYPERCALL);
+	cap.cap = KVM_CAP_EXIT_HYPERCALL;
+	cap.flags = 0;
+	cap.args[0] = (1 << KVM_HC_MAP_GPA_RANGE);
+	vm_ioctl(vm, KVM_ENABLE_CAP, &cap);
+
+	vm_userspace_mem_region_add(vm, test_mem_src, TEST_AREA_GPA,
+		TEST_AREA_SLOT, TEST_AREA_SIZE / vm->page_size, KVM_MEM_PRIVATE);
+	vm_allocate_private_mem(vm, TEST_AREA_GPA, TEST_AREA_SIZE);
+
+	virt_map(vm, TEST_AREA_GPA, TEST_AREA_GPA, TEST_AREA_SIZE/vm->page_size);
+
+	host_conv_test_fn(vm, vcpu);
+
+	kvm_vm_free(vm);
+}
diff --git a/tools/testing/selftests/kvm/x86_64/private_mem_test.c b/tools/testing/selftests/kvm/x86_64/private_mem_test.c
index 015ada2e3d54..72c2f913ee92 100644
--- a/tools/testing/selftests/kvm/x86_64/private_mem_test.c
+++ b/tools/testing/selftests/kvm/x86_64/private_mem_test.c
@@ -3,197 +3,12 @@
  * Copyright (C) 2022, Google LLC.
  */
 #define _GNU_SOURCE /* for program_invocation_short_name */
-#include <fcntl.h>
-#include <limits.h>
-#include <sched.h>
-#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/ioctl.h>
 
-#include <linux/compiler.h>
-#include <linux/kernel.h>
-#include <linux/kvm_para.h>
-#include <linux/memfd.h>
-
-#include <test_util.h>
 #include <kvm_util.h>
-#include <private_mem.h>
-#include <processor.h>
-
-#define TEST_AREA_SLOT		10
-#define TEST_AREA_GPA		0xC0000000
-#define TEST_AREA_SIZE		(2 * 1024 * 1024)
-#define GUEST_TEST_MEM_OFFSET	(1 * 1024 * 1024)
-#define GUEST_TEST_MEM_SIZE	(10 * 4096)
-
-#define VM_STAGE_PROCESSED(x)	pr_info("Processed stage %s\n", #x)
-
-#define TEST_MEM_DATA_PATTERN1	0x66
-#define TEST_MEM_DATA_PATTERN2	0x99
-#define TEST_MEM_DATA_PATTERN3	0x33
-#define TEST_MEM_DATA_PATTERN4	0xaa
-#define TEST_MEM_DATA_PATTERN5	0x12
-
-static bool verify_mem_contents(void *mem, uint32_t size, uint8_t pattern)
-{
-	uint8_t *buf = (uint8_t *)mem;
-
-	for (uint32_t i = 0; i < size; i++) {
-		if (buf[i] != pattern)
-			return false;
-	}
-
-	return true;
-}
-
-static void populate_test_area(void *test_area_base, uint64_t pattern)
-{
-	memset(test_area_base, pattern, TEST_AREA_SIZE);
-}
-
-static void populate_guest_test_mem(void *guest_test_mem, uint64_t pattern)
-{
-	memset(guest_test_mem, pattern, GUEST_TEST_MEM_SIZE);
-}
-
-static bool verify_test_area(void *test_area_base, uint64_t area_pattern,
-	uint64_t guest_pattern)
-{
-	void *guest_test_mem = test_area_base + GUEST_TEST_MEM_OFFSET;
-	void *test_area2_base = guest_test_mem + GUEST_TEST_MEM_SIZE;
-	uint64_t test_area2_size = (TEST_AREA_SIZE - (GUEST_TEST_MEM_OFFSET +
-			GUEST_TEST_MEM_SIZE));
-
-	return (verify_mem_contents(test_area_base, GUEST_TEST_MEM_OFFSET, area_pattern) &&
-		verify_mem_contents(guest_test_mem, GUEST_TEST_MEM_SIZE, guest_pattern) &&
-		verify_mem_contents(test_area2_base, test_area2_size, area_pattern));
-}
-
-#define GUEST_STARTED			0
-#define GUEST_PRIVATE_MEM_POPULATED	1
-#define GUEST_SHARED_MEM_POPULATED	2
-#define GUEST_PRIVATE_MEM_POPULATED2	3
-
-/*
- * Run memory conversion tests with explicit conversion:
- * Execute KVM hypercall to map/unmap gpa range which will cause userspace exit
- * to back/unback private memory. Subsequent accesses by guest to the gpa range
- * will not cause exit to userspace.
- *
- * Test memory conversion scenarios with following steps:
- * 1) Access private memory using private access and verify that memory contents
- *   are not visible to userspace.
- * 2) Convert memory to shared using explicit conversions and ensure that
- *   userspace is able to access the shared regions.
- * 3) Convert memory back to private using explicit conversions and ensure that
- *   userspace is again not able to access converted private regions.
- */
-static void guest_conv_test_fn(void)
-{
-	void *test_area_base = (void *)TEST_AREA_GPA;
-	void *guest_test_mem = (void *)(TEST_AREA_GPA + GUEST_TEST_MEM_OFFSET);
-	uint64_t guest_test_size = GUEST_TEST_MEM_SIZE;
-
-	GUEST_SYNC(GUEST_STARTED);
-
-	populate_test_area(test_area_base, TEST_MEM_DATA_PATTERN1);
-	GUEST_SYNC(GUEST_PRIVATE_MEM_POPULATED);
-	GUEST_ASSERT(verify_test_area(test_area_base, TEST_MEM_DATA_PATTERN1,
-		TEST_MEM_DATA_PATTERN1));
-
-	kvm_hypercall_map_shared((uint64_t)guest_test_mem, guest_test_size);
-
-	populate_guest_test_mem(guest_test_mem, TEST_MEM_DATA_PATTERN2);
-
-	GUEST_SYNC(GUEST_SHARED_MEM_POPULATED);
-	GUEST_ASSERT(verify_test_area(test_area_base, TEST_MEM_DATA_PATTERN1,
-		TEST_MEM_DATA_PATTERN5));
-
-	kvm_hypercall_map_private((uint64_t)guest_test_mem, guest_test_size);
-
-	populate_guest_test_mem(guest_test_mem, TEST_MEM_DATA_PATTERN3);
-	GUEST_SYNC(GUEST_PRIVATE_MEM_POPULATED2);
-
-	GUEST_ASSERT(verify_test_area(test_area_base, TEST_MEM_DATA_PATTERN1,
-		TEST_MEM_DATA_PATTERN3));
-	GUEST_DONE();
-}
-
-#define ASSERT_CONV_TEST_EXIT_IO(vcpu, stage) \
-	{ \
-		struct ucall uc; \
-		ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_IO); \
-		ASSERT_EQ(get_ucall(vcpu, &uc), UCALL_SYNC); \
-		ASSERT_EQ(uc.args[1], stage); \
-	}
-
-#define ASSERT_GUEST_DONE(vcpu) \
-	{ \
-		struct ucall uc; \
-		ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_IO); \
-		ASSERT_EQ(get_ucall(vcpu, &uc), UCALL_DONE); \
-	}
-
-static void host_conv_test_fn(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
-{
-	void *test_area_hva = addr_gpa2hva(vm, TEST_AREA_GPA);
-	void *guest_test_mem_hva = (test_area_hva + GUEST_TEST_MEM_OFFSET);
-
-	vcpu_run_and_handle_mapgpa(vm, vcpu);
-	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_STARTED);
-	populate_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4);
-	VM_STAGE_PROCESSED(GUEST_STARTED);
-
-	vcpu_run_and_handle_mapgpa(vm, vcpu);
-	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_PRIVATE_MEM_POPULATED);
-	TEST_ASSERT(verify_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4,
-			TEST_MEM_DATA_PATTERN4), "failed");
-	VM_STAGE_PROCESSED(GUEST_PRIVATE_MEM_POPULATED);
-
-	vcpu_run_and_handle_mapgpa(vm, vcpu);
-	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_SHARED_MEM_POPULATED);
-	TEST_ASSERT(verify_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4,
-			TEST_MEM_DATA_PATTERN2), "failed");
-	populate_guest_test_mem(guest_test_mem_hva, TEST_MEM_DATA_PATTERN5);
-	VM_STAGE_PROCESSED(GUEST_SHARED_MEM_POPULATED);
-
-	vcpu_run_and_handle_mapgpa(vm, vcpu);
-	ASSERT_CONV_TEST_EXIT_IO(vcpu, GUEST_PRIVATE_MEM_POPULATED2);
-	TEST_ASSERT(verify_test_area(test_area_hva, TEST_MEM_DATA_PATTERN4,
-			TEST_MEM_DATA_PATTERN5), "failed");
-	VM_STAGE_PROCESSED(GUEST_PRIVATE_MEM_POPULATED2);
-
-	vcpu_run_and_handle_mapgpa(vm, vcpu);
-	ASSERT_GUEST_DONE(vcpu);
-}
-
-static void execute_vm_with_private_test_mem(
-			enum vm_mem_backing_src_type test_mem_src)
-{
-	struct kvm_vm *vm;
-	struct kvm_enable_cap cap;
-	struct kvm_vcpu *vcpu;
-
-	vm = vm_create_with_one_vcpu(&vcpu, guest_conv_test_fn);
-
-	vm_check_cap(vm, KVM_CAP_EXIT_HYPERCALL);
-	cap.cap = KVM_CAP_EXIT_HYPERCALL;
-	cap.flags = 0;
-	cap.args[0] = (1 << KVM_HC_MAP_GPA_RANGE);
-	vm_ioctl(vm, KVM_ENABLE_CAP, &cap);
-
-	vm_userspace_mem_region_add(vm, test_mem_src, TEST_AREA_GPA,
-		TEST_AREA_SLOT, TEST_AREA_SIZE / vm->page_size, KVM_MEM_PRIVATE);
-	vm_allocate_private_mem(vm, TEST_AREA_GPA, TEST_AREA_SIZE);
-
-	virt_map(vm, TEST_AREA_GPA, TEST_AREA_GPA, TEST_AREA_SIZE/vm->page_size);
-
-	host_conv_test_fn(vm, vcpu);
-
-	kvm_vm_free(vm);
-}
+#include <private_mem_test_helper.h>
 
 int main(int argc, char *argv[])
 {
-- 
2.39.0.314.g84b9a713c41-goog

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