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Message-Id: <20221110015327.3389351-4-oliver.upton@linux.dev>
Date: Thu, 10 Nov 2022 01:53:27 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>,
Marc Zyngier <maz@...nel.org>,
James Morse <james.morse@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Oliver Upton <oliver.upton@...ux.dev>
Cc: Raghavendra Rao Ananta <rananta@...gle.com>,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-kselftest@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
kvmarm@...ts.cs.columbia.edu
Subject: [RFC PATCH 3/3] KVM: selftests: Test user hypercalls
Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
---
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 1 +
.../selftests/kvm/aarch64/user_hypercalls.c | 130 ++++++++++++++++++
3 files changed, 132 insertions(+)
create mode 100644 tools/testing/selftests/kvm/aarch64/user_hypercalls.c
diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 2f0d705db9db..4f45e987985f 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -5,6 +5,7 @@
/aarch64/get-reg-list
/aarch64/hypercalls
/aarch64/psci_test
+/aarch64/user_hypercalls
/aarch64/vcpu_width_config
/aarch64/vgic_init
/aarch64/vgic_irq
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 0172eb6cb6ee..8ac1988ea669 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -153,6 +153,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
TEST_GEN_PROGS_aarch64 += aarch64/hypercalls
TEST_GEN_PROGS_aarch64 += aarch64/psci_test
+TEST_GEN_PROGS_aarch64 += aarch64/user_hypercalls
TEST_GEN_PROGS_aarch64 += aarch64/vcpu_width_config
TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
diff --git a/tools/testing/selftests/kvm/aarch64/user_hypercalls.c b/tools/testing/selftests/kvm/aarch64/user_hypercalls.c
new file mode 100644
index 000000000000..94ac821c5474
--- /dev/null
+++ b/tools/testing/selftests/kvm/aarch64/user_hypercalls.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/arm-smccc.h>
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "test_util.h"
+
+struct test_case {
+ uint64_t cap;
+ uint32_t function;
+ uint64_t args[6];
+};
+
+#define TEST_OWNER(name) \
+{ \
+ .cap = BIT_ULL(KVM_ARM_USER_HYPERCALL_OWNER_ ## name), \
+ .function = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
+ ARM_SMCCC_SMC_32, \
+ ARM_SMCCC_OWNER_ ## name, \
+ 0), \
+ .args = { \
+ __LINE__, \
+ __LINE__ + 1, \
+ __LINE__ + 2, \
+ __LINE__ + 3, \
+ __LINE__ + 4, \
+ __LINE__ + 5, \
+ }, \
+}, \
+{ \
+ .cap = BIT_ULL(KVM_ARM_USER_HYPERCALL_OWNER_ ## name), \
+ .function = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
+ ARM_SMCCC_SMC_64, \
+ ARM_SMCCC_OWNER_ ## name, \
+ 0), \
+ .args = { \
+ __LINE__, \
+ __LINE__ + 1, \
+ __LINE__ + 2, \
+ __LINE__ + 3, \
+ __LINE__ + 4, \
+ __LINE__ + 5, \
+ }, \
+} \
+
+static struct test_case test_cases[] = {
+ TEST_OWNER(ARCH),
+ TEST_OWNER(CPU),
+ TEST_OWNER(SIP),
+ TEST_OWNER(OEM),
+ TEST_OWNER(STANDARD),
+ TEST_OWNER(STANDARD_HYP),
+ TEST_OWNER(VENDOR_HYP),
+ TEST_OWNER(TRUSTED_APP),
+ TEST_OWNER(TRUSTED_OS),
+};
+
+static void guest_main(const struct test_case *test)
+{
+ struct arm_smccc_res unused;
+
+ smccc_hvc(test->function, test->args[0], test->args[1], test->args[2],
+ test->args[3], test->args[4], test->args[5], 0, &unused);
+
+ GUEST_ASSERT(0);
+}
+
+static void handle_hvc(const struct test_case *test, struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+
+ TEST_ASSERT(run->hypercall.nr == test->function,
+ "unexpected function ID: %llx (expected %x)",
+ run->hypercall.nr, test->function);
+
+ TEST_ASSERT(!memcmp(&run->hypercall.args, &test->args, sizeof(test->args)),
+ "unexpected hypercall arguments");
+}
+
+static void handle_ucall(struct kvm_vcpu *vcpu)
+{
+ struct ucall uc;
+
+ switch (get_ucall(vcpu, &uc)) {
+ case UCALL_ABORT:
+ REPORT_GUEST_ASSERT(uc);
+ break;
+ default:
+ TEST_FAIL("unhandled ucall: %lu", uc.cmd);
+ }
+}
+
+static void run_test(const struct test_case *test)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+
+ vm = vm_create_with_one_vcpu(&vcpu, guest_main);
+ vm_enable_cap(vm, KVM_CAP_ARM_USER_HYPERCALLS, test->cap);
+ ucall_init(vm, NULL);
+
+ vcpu_args_set(vcpu, 1, test);
+
+ vcpu_run(vcpu);
+ switch (vcpu->run->exit_reason) {
+ case KVM_EXIT_HYPERCALL:
+ handle_hvc(test, vcpu);
+ break;
+ case KVM_EXIT_MMIO:
+ handle_ucall(vcpu);
+ break;
+ default:
+ TEST_FAIL("unhandled exit reason: %u (%s)", vcpu->run->exit_reason,
+ exit_reason_str(vcpu->run->exit_reason));
+ }
+
+ ucall_uninit(vm);
+ kvm_vm_free(vm);
+}
+
+int main(void)
+{
+ int i;
+
+ TEST_REQUIRE(kvm_has_cap(KVM_CAP_ARM_USER_HYPERCALLS));
+
+ for (i = 0; i < ARRAY_SIZE(test_cases); i++)
+ run_test(&test_cases[i]);
+}
--
2.38.1.431.g37b22c650d-goog
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