KVM: selftests: Convert hyperv_svm_test away from VCPU_ID

Convert hyperv_svm_test to use vm_create_with_one_vcpu() and pass around a
'struct kvm_vcpu' object instead of using a global VCPU_ID.  Note, this is
a "functional" change in the sense that the test now creates a vCPU with
vcpu_id==0 instead of vcpu_id==1.  The non-zero VCPU_ID was 100% arbitrary
and added little to no validation coverage.  If testing non-zero vCPU IDs
is desirable for generic tests, that can be done in the future by tweaking
the VM creation helpers.

Opportunistically use vcpu_run() instead of _vcpu_run(), the test expects
KVM_RUN to succeed.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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

@@ -21,7 +21,6 @@
 #include "svm_util.h"
 #include "hyperv.h"
 
-#define VCPU_ID		1
 #define L2_GUEST_STACK_SIZE 256
 
 struct hv_enlightenments {
@@ -122,6 +121,7 @@ int main(int argc, char *argv[])
 {
 	vm_vaddr_t nested_gva = 0;
 
+	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 	struct kvm_run *run;
 	struct ucall uc;
@@ -132,20 +132,20 @@ int main(int argc, char *argv[])
 		exit(KSFT_SKIP);
 	}
 	/* Create VM */
-	vm = vm_create_default(VCPU_ID, 0, guest_code);
-	vcpu_set_hv_cpuid(vm, VCPU_ID);
-	run = vcpu_state(vm, VCPU_ID);
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+	vcpu_set_hv_cpuid(vm, vcpu->id);
+	run = vcpu->run;
 	vcpu_alloc_svm(vm, &nested_gva);
-	vcpu_args_set(vm, VCPU_ID, 1, nested_gva);
+	vcpu_args_set(vm, vcpu->id, 1, nested_gva);
 
 	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]);