KVM: selftests: Convert hyperv_clock away from VCPU_ID

Convert hyperv_clock to use vm_create_with_one_vcpu() and pass around a
'struct kvm_vcpu' object instead of using a global VCPU_ID.

Opportunistically use vcpu_run() instead of _vcpu_run() with an open
coded assert that KVM_RUN succeeded.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/x86_64/hyperv_clock.c

@@ -173,23 +173,21 @@ static void guest_main(struct ms_hyperv_tsc_page *tsc_page, vm_paddr_t tsc_page_
 	GUEST_DONE();
 }
 
-#define VCPU_ID 0
-
-static void host_check_tsc_msr_rdtsc(struct kvm_vm *vm)
+static void host_check_tsc_msr_rdtsc(struct kvm_vcpu *vcpu)
 {
 	u64 tsc_freq, r1, r2, t1, t2;
 	s64 delta_ns;
 
-	tsc_freq = vcpu_get_msr(vm, VCPU_ID, HV_X64_MSR_TSC_FREQUENCY);
+	tsc_freq = vcpu_get_msr(vcpu->vm, vcpu->id, HV_X64_MSR_TSC_FREQUENCY);
 	TEST_ASSERT(tsc_freq > 0, "TSC frequency must be nonzero");
 
 	/* For increased accuracy, take mean rdtsc() before and afrer ioctl */
 	r1 = rdtsc();
-	t1 = vcpu_get_msr(vm, VCPU_ID, HV_X64_MSR_TIME_REF_COUNT);
+	t1 = vcpu_get_msr(vcpu->vm, vcpu->id, HV_X64_MSR_TIME_REF_COUNT);
 	r1 = (r1 + rdtsc()) / 2;
 	nop_loop();
 	r2 = rdtsc();
-	t2 = vcpu_get_msr(vm, VCPU_ID, HV_X64_MSR_TIME_REF_COUNT);
+	t2 = vcpu_get_msr(vcpu->vm, vcpu->id, HV_X64_MSR_TIME_REF_COUNT);
 	r2 = (r2 + rdtsc()) / 2;
 
 	TEST_ASSERT(t2 > t1, "Time reference MSR is not monotonic (%ld <= %ld)", t1, t2);
@@ -207,33 +205,34 @@ static void host_check_tsc_msr_rdtsc(struct kvm_vm *vm)
 
 int main(void)
 {
+	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 	struct kvm_run *run;
 	struct ucall uc;
 	vm_vaddr_t tsc_page_gva;
 	int stage;
 
-	vm = vm_create_default(VCPU_ID, 0, guest_main);
-	run = vcpu_state(vm, VCPU_ID);
+	vm = vm_create_with_one_vcpu(&vcpu, guest_main);
+	run = vcpu->run;
 
-	vcpu_set_hv_cpuid(vm, VCPU_ID);
+	vcpu_set_hv_cpuid(vm, vcpu->id);
 
 	tsc_page_gva = vm_vaddr_alloc_page(vm);
 	memset(addr_gva2hva(vm, tsc_page_gva), 0x0, getpagesize());
 	TEST_ASSERT((addr_gva2gpa(vm, tsc_page_gva) & (getpagesize() - 1)) == 0,
 		"TSC page has to be page aligned\n");
-	vcpu_args_set(vm, VCPU_ID, 2, tsc_page_gva, addr_gva2gpa(vm, tsc_page_gva));
+	vcpu_args_set(vm, vcpu->id, 2, tsc_page_gva, addr_gva2gpa(vm, tsc_page_gva));
 
-	host_check_tsc_msr_rdtsc(vm);
+	host_check_tsc_msr_rdtsc(vcpu);
 
 	for (stage = 1;; stage++) {
-		_vcpu_run(vm, VCPU_ID);
+		vcpu_run(vm, vcpu->id);
 		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 			    "Stage %d: unexpected exit reason: %u (%s),\n",
 			    stage, run->exit_reason,
 			    exit_reason_str(run->exit_reason));
 
-		switch (get_ucall(vm, VCPU_ID, &uc)) {
+		switch (get_ucall(vm, vcpu->id, &uc)) {
 		case UCALL_ABORT:
 			TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
 				  __FILE__, uc.args[1]);