Hyper-V extended hypercalls by default exit to userspace. Verify
userspace gets the call, update the result and then guest verifies
result it received.
Signed-off-by: Vipin Sharma <vipinsh@xxxxxxxxxx>
---
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 1 +
.../kvm/x86_64/hyperv_extended_hcalls.c | 90 +++++++++++++++++++
3 files changed, 92 insertions(+)
create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_extended_hcalls.c
diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 2f0d705db9db..ffe06dd1cc6e 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -24,6 +24,7 @@
/x86_64/kvm_pv_test
/x86_64/hyperv_clock
/x86_64/hyperv_cpuid
+/x86_64/hyperv_extended_hcalls
/x86_64/hyperv_features
/x86_64/hyperv_svm_test
/x86_64/max_vcpuid_cap_test
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 0172eb6cb6ee..366345099363 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -85,6 +85,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/emulator_error_test
TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
+TEST_GEN_PROGS_x86_64 += x86_64/hyperv_extended_hcalls
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_svm_test
TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_extended_hcalls.c b/tools/testing/selftests/kvm/x86_64/hyperv_extended_hcalls.c
new file mode 100644
index 000000000000..d378877235d4
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_extended_hcalls.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Test Hyper-V extended hypercalls
+ *
+ * Copyright 2020 Google LLC
+ * Author: Vipin Sharma <vipinsh@xxxxxxxxxx>
+ */
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "hyperv.h"
+
+/* Any value is fine */
+#define EXT_CAPABILITIES 0xbull
+
+static void guest_code(vm_vaddr_t pgs_gpa, vm_vaddr_t output_pg_gva)
+{
+ uint64_t res, vector;
+ uint64_t *output_gva;
+
+ wrmsr(HV_X64_MSR_GUEST_OS_ID, hv_linux_guest_id());
+ wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa);
+
+ output_gva = (uint64_t *)output_pg_gva;
+
+ vector = hypercall(HV_EXT_CALL_QUERY_CAPABILITIES, pgs_gpa,
+ pgs_gpa + 4096, &res);
+
+ GUEST_ASSERT_1(!vector, vector);
+ GUEST_ASSERT_2(res == HV_STATUS_SUCCESS, res, HV_STATUS_SUCCESS);
+
+ /* TLFS states output will be a uint64_t value */
+ GUEST_ASSERT_2(*output_gva == EXT_CAPABILITIES, *output_gva,
+ EXT_CAPABILITIES);
+
+ GUEST_DONE();
+}
+
+static void guest_extended_hcall_test(void)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_run *run;
+ struct kvm_vm *vm;
+ struct ucall uc;
+ vm_vaddr_t hcall_page;
+ uint64_t *outval;
+
+ vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+ run = vcpu->run;
+ vcpu_enable_cap(vcpu, KVM_CAP_HYPERV_ENFORCE_CPUID, 1);
+ vcpu_set_hv_cpuid(vcpu);
+
+ /* Hypercall input/output */
+ hcall_page = vm_vaddr_alloc_pages(vm, 2);
+ memset(addr_gva2hva(vm, hcall_page), 0x0, 2 * getpagesize());
+ vcpu_args_set(vcpu, 2, addr_gva2gpa(vm, hcall_page), hcall_page + 4096);
+
+ vcpu_run(vcpu);
+
+ TEST_ASSERT((run->exit_reason == KVM_EXIT_HYPERV),
+ "unexpected exit reason: %u (%s)", run->exit_reason,
+ exit_reason_str(run->exit_reason));
+
+ outval = addr_gpa2hva(vm, run->hyperv.u.hcall.params[1]);
+ *outval = EXT_CAPABILITIES;
+ run->hyperv.u.hcall.result = HV_STATUS_SUCCESS;
+
+ vcpu_run(vcpu);
+
+ TEST_ASSERT((run->exit_reason == KVM_EXIT_IO),
+ "unexpected exit reason: %u (%s)", run->exit_reason,
+ exit_reason_str(run->exit_reason));
+
+ switch (get_ucall(vcpu, &uc)) {
+ case UCALL_ABORT:
+ REPORT_GUEST_ASSERT_2(uc, "arg1 = %ld, arg2 = %ld");
+ break;
+ case UCALL_DONE:
+ break;
+ default:
+ TEST_FAIL("Unhandled ucall: %ld", uc.cmd);
+ }
+
+ kvm_vm_free(vm);
+}
+
+int main(void)
+{
+ guest_extended_hcall_test();
+}
--
2.38.1.273.g43a17bfeac-goog
