From: Oliver Upton <oupton@google.com>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Peter Shier <pshier@google.com>,
Sean Christopherson <seanjc@google.com>,
David Matlack <dmatlack@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
linux-arm-kernel@lists.infradead.org,
Jim Mattson <jmattson@google.com>
Subject: [PATCH v8 5/9] selftests: KVM: Introduce system counter offset test
Date: Thu, 16 Sep 2021 18:15:51 +0000 [thread overview]
Message-ID: <20210916181555.973085-6-oupton@google.com> (raw)
In-Reply-To: <20210916181555.973085-1-oupton@google.com>
Introduce a KVM selftest to verify that userspace manipulation of the
TSC (via the new vCPU attribute) results in the correct behavior within
the guest.
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Oliver Upton <oupton@google.com>
---
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 1 +
.../kvm/system_counter_offset_test.c | 132 ++++++++++++++++++
3 files changed, 134 insertions(+)
create mode 100644 tools/testing/selftests/kvm/system_counter_offset_test.c
diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 86a063d1cd3e..aa5a5197716e 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -52,3 +52,4 @@
/set_memory_region_test
/steal_time
/kvm_binary_stats_test
+/system_counter_offset_test
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 1f969b0192f6..225803ac95bb 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -84,6 +84,7 @@ TEST_GEN_PROGS_x86_64 += memslot_perf_test
TEST_GEN_PROGS_x86_64 += set_memory_region_test
TEST_GEN_PROGS_x86_64 += steal_time
TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test
+TEST_GEN_PROGS_x86_64 += system_counter_offset_test
TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
diff --git a/tools/testing/selftests/kvm/system_counter_offset_test.c b/tools/testing/selftests/kvm/system_counter_offset_test.c
new file mode 100644
index 000000000000..b337bbbfa41f
--- /dev/null
+++ b/tools/testing/selftests/kvm/system_counter_offset_test.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021, Google LLC.
+ *
+ * Tests for adjusting the system counter from userspace
+ */
+#include <asm/kvm_para.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+
+#define VCPU_ID 0
+
+#ifdef __x86_64__
+
+struct test_case {
+ uint64_t tsc_offset;
+};
+
+static struct test_case test_cases[] = {
+ { 0 },
+ { 180 * NSEC_PER_SEC },
+ { -180 * NSEC_PER_SEC },
+};
+
+static void check_preconditions(struct kvm_vm *vm)
+{
+ if (!_vcpu_has_device_attr(vm, VCPU_ID, KVM_VCPU_TSC_CTRL, KVM_VCPU_TSC_OFFSET))
+ return;
+
+ print_skip("KVM_VCPU_TSC_OFFSET not supported; skipping test");
+ exit(KSFT_SKIP);
+}
+
+static void setup_system_counter(struct kvm_vm *vm, struct test_case *test)
+{
+ vcpu_access_device_attr(vm, VCPU_ID, KVM_VCPU_TSC_CTRL,
+ KVM_VCPU_TSC_OFFSET, &test->tsc_offset, true);
+}
+
+static uint64_t guest_read_system_counter(struct test_case *test)
+{
+ return rdtsc();
+}
+
+static uint64_t host_read_guest_system_counter(struct test_case *test)
+{
+ return rdtsc() + test->tsc_offset;
+}
+
+#else /* __x86_64__ */
+
+#error test not implemented for this architecture!
+
+#endif
+
+#define GUEST_SYNC_CLOCK(__stage, __val) \
+ GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0)
+
+static void guest_main(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
+ struct test_case *test = &test_cases[i];
+
+ GUEST_SYNC_CLOCK(i, guest_read_system_counter(test));
+ }
+}
+
+static void handle_sync(struct ucall *uc, uint64_t start, uint64_t end)
+{
+ uint64_t obs = uc->args[2];
+
+ TEST_ASSERT(start <= obs && obs <= end,
+ "unexpected system counter value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]",
+ obs, start, end);
+
+ pr_info("system counter value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n",
+ obs, start, end);
+}
+
+static void handle_abort(struct ucall *uc)
+{
+ TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0],
+ __FILE__, uc->args[1]);
+}
+
+static void enter_guest(struct kvm_vm *vm)
+{
+ uint64_t start, end;
+ struct ucall uc;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
+ struct test_case *test = &test_cases[i];
+
+ setup_system_counter(vm, test);
+ start = host_read_guest_system_counter(test);
+ vcpu_run(vm, VCPU_ID);
+ end = host_read_guest_system_counter(test);
+
+ switch (get_ucall(vm, VCPU_ID, &uc)) {
+ case UCALL_SYNC:
+ handle_sync(&uc, start, end);
+ break;
+ case UCALL_ABORT:
+ handle_abort(&uc);
+ return;
+ default:
+ TEST_ASSERT(0, "unhandled ucall %ld\n",
+ get_ucall(vm, VCPU_ID, &uc));
+ }
+ }
+}
+
+int main(void)
+{
+ struct kvm_vm *vm;
+
+ vm = vm_create_default(VCPU_ID, 0, guest_main);
+ check_preconditions(vm);
+ ucall_init(vm, NULL);
+
+ enter_guest(vm);
+ kvm_vm_free(vm);
+}
--
2.33.0.464.g1972c5931b-goog
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next prev parent reply other threads:[~2021-09-16 18:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-16 18:15 [PATCH v8 0/9] selftests: KVM: Test offset-based counter controls Oliver Upton
2021-09-16 18:15 ` [PATCH v8 1/9] tools: arch: x86: pull in pvclock headers Oliver Upton
2021-09-16 18:15 ` [PATCH v8 2/9] selftests: KVM: Add test for KVM_{GET,SET}_CLOCK Oliver Upton
2021-10-05 6:51 ` Andrew Jones
2021-09-16 18:15 ` [PATCH v8 3/9] selftests: KVM: Fix kvm device helper ioctl assertions Oliver Upton
2021-09-16 18:15 ` [PATCH v8 4/9] selftests: KVM: Add helpers for vCPU device attributes Oliver Upton
2021-09-16 18:15 ` Oliver Upton [this message]
2021-09-16 18:15 ` [PATCH v8 6/9] selftests: KVM: Add support for aarch64 to system_counter_offset_test Oliver Upton
2021-09-16 18:15 ` [PATCH v8 7/9] selftests: KVM: Test physical counter offsetting Oliver Upton
2021-09-16 18:15 ` [PATCH v8 8/9] selftests: KVM: Add counter emulation benchmark Oliver Upton
2021-09-16 18:15 ` [PATCH v8 9/9] selftests: KVM: Test vtimer offset reg in get-reg-list Oliver Upton
2021-09-20 12:28 ` Andrew Jones
2021-09-24 16:43 ` [PATCH v8 0/9] selftests: KVM: Test offset-based counter controls Paolo Bonzini
2021-10-05 8:58 ` Paolo Bonzini
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