KVM: selftests: Return created vcpu from vm_vcpu_add_default()

Return the created 'struct kvm_vcpu' object from vm_vcpu_add_default(),
which cleans up a few tests and will eventually allow removing vcpu_get()
entirely.

Opportunistically rename @vcpuid to @vcpu_id to follow preferred kernel
style.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/include/aarch64/processor.h

@@ -64,8 +64,9 @@ static inline void set_reg(struct kvm_vm *vm, uint32_t vcpuid, uint64_t id, uint
 }
 
 void aarch64_vcpu_setup(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_vcpu_init *init);
-void aarch64_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid,
-			      struct kvm_vcpu_init *init, void *guest_code);
+struct kvm_vcpu *aarch64_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpu_id,
+					  struct kvm_vcpu_init *init,
+					  void *guest_code);
 
 struct ex_regs {
 	u64 regs[31];

tools/testing/selftests/kvm/include/kvm_util_base.h

@@ -656,12 +656,14 @@ static inline void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid,
  *   vcpuid - The id of the VCPU to add to the VM.
  *   guest_code - The vCPU's entry point
  */
-void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code);
+struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
+				  void *guest_code);
 
-static inline void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid,
+static inline struct kvm_vcpu *vm_vcpu_add_default(struct kvm_vm *vm,
+						   uint32_t vcpu_id,
 						   void *guest_code)
 {
-	vm_arch_vcpu_add(vm, vcpuid, guest_code);
+	return vm_arch_vcpu_add(vm, vcpu_id, guest_code);
 }
 
 void virt_arch_pgd_alloc(struct kvm_vm *vm);

tools/testing/selftests/kvm/lib/aarch64/processor.c

@@ -314,25 +314,29 @@ void vcpu_arch_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t in
 		indent, "", pstate, pc);
 }
 
-void aarch64_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid,
-			      struct kvm_vcpu_init *init, void *guest_code)
+struct kvm_vcpu *aarch64_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpu_id,
+					  struct kvm_vcpu_init *init,
+					  void *guest_code)
 {
 	size_t stack_size = vm->page_size == 4096 ?
 					DEFAULT_STACK_PGS * vm->page_size :
 					vm->page_size;
 	uint64_t stack_vaddr = vm_vaddr_alloc(vm, stack_size,
 					      DEFAULT_ARM64_GUEST_STACK_VADDR_MIN);
+	struct kvm_vcpu *vcpu = vm_vcpu_add(vm, vcpu_id);
 
-	vm_vcpu_add(vm, vcpuid);
-	aarch64_vcpu_setup(vm, vcpuid, init);
+	aarch64_vcpu_setup(vm, vcpu_id, init);
 
-	set_reg(vm, vcpuid, ARM64_CORE_REG(sp_el1), stack_vaddr + stack_size);
-	set_reg(vm, vcpuid, ARM64_CORE_REG(regs.pc), (uint64_t)guest_code);
+	set_reg(vm, vcpu_id, ARM64_CORE_REG(sp_el1), stack_vaddr + stack_size);
+	set_reg(vm, vcpu_id, ARM64_CORE_REG(regs.pc), (uint64_t)guest_code);
+
+	return vcpu;
 }
 
-void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
+struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
+				  void *guest_code)
 {
-	aarch64_vcpu_add_default(vm, vcpuid, NULL, guest_code);
+	return aarch64_vcpu_add_default(vm, vcpu_id, NULL, guest_code);
 }
 
 void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)

tools/testing/selftests/kvm/lib/riscv/processor.c

@@ -274,7 +274,8 @@ static void __aligned(16) guest_unexp_trap(void)
 		  0, 0, 0, 0, 0, 0);
 }
 
-void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
+struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
+				  void *guest_code)
 {
 	int r;
 	size_t stack_size = vm->page_size == 4096 ?
@@ -284,9 +285,10 @@ void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
 					DEFAULT_RISCV_GUEST_STACK_VADDR_MIN);
 	unsigned long current_gp = 0;
 	struct kvm_mp_state mps;
+	struct kvm_vcpu *vcpu;
 
-	vm_vcpu_add(vm, vcpuid);
-	riscv_vcpu_mmu_setup(vm, vcpuid);
+	vcpu = vm_vcpu_add(vm, vcpu_id);
+	riscv_vcpu_mmu_setup(vm, vcpu_id);
 
 	/*
 	 * With SBI HSM support in KVM RISC-V, all secondary VCPUs are
@@ -294,23 +296,25 @@ void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
 	 * are powered-on using KVM_SET_MP_STATE ioctl().
 	 */
 	mps.mp_state = KVM_MP_STATE_RUNNABLE;
-	r = __vcpu_ioctl(vm, vcpuid, KVM_SET_MP_STATE, &mps);
+	r = __vcpu_ioctl(vm, vcpu_id, KVM_SET_MP_STATE, &mps);
 	TEST_ASSERT(!r, "IOCTL KVM_SET_MP_STATE failed (error %d)", r);
 
 	/* Setup global pointer of guest to be same as the host */
 	asm volatile (
 		"add %0, gp, zero" : "=r" (current_gp) : : "memory");
-	set_reg(vm, vcpuid, RISCV_CORE_REG(regs.gp), current_gp);
+	set_reg(vm, vcpu_id, RISCV_CORE_REG(regs.gp), current_gp);
 
 	/* Setup stack pointer and program counter of guest */
-	set_reg(vm, vcpuid, RISCV_CORE_REG(regs.sp),
+	set_reg(vm, vcpu_id, RISCV_CORE_REG(regs.sp),
 		stack_vaddr + stack_size);
-	set_reg(vm, vcpuid, RISCV_CORE_REG(regs.pc),
+	set_reg(vm, vcpu_id, RISCV_CORE_REG(regs.pc),
 		(unsigned long)guest_code);
 
 	/* Setup default exception vector of guest */
-	set_reg(vm, vcpuid, RISCV_CSR_REG(stvec),
+	set_reg(vm, vcpu_id, RISCV_CSR_REG(stvec),
 		(unsigned long)guest_unexp_trap);
+
+	return vcpu;
 }
 
 void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)

tools/testing/selftests/kvm/lib/s390x/processor.c

@@ -154,12 +154,14 @@ void virt_arch_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
 	virt_dump_region(stream, vm, indent, vm->pgd);
 }
 
-void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
+struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
+				  void *guest_code)
 {
 	size_t stack_size =  DEFAULT_STACK_PGS * getpagesize();
 	uint64_t stack_vaddr;
 	struct kvm_regs regs;
 	struct kvm_sregs sregs;
+	struct kvm_vcpu *vcpu;
 	struct kvm_run *run;
 
 	TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
@@ -168,21 +170,23 @@ void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
 	stack_vaddr = vm_vaddr_alloc(vm, stack_size,
 				     DEFAULT_GUEST_STACK_VADDR_MIN);
 
-	vm_vcpu_add(vm, vcpuid);
+	vcpu = vm_vcpu_add(vm, vcpu_id);
 
 	/* Setup guest registers */
-	vcpu_regs_get(vm, vcpuid, &regs);
+	vcpu_regs_get(vm, vcpu_id, &regs);
 	regs.gprs[15] = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize()) - 160;
-	vcpu_regs_set(vm, vcpuid, &regs);
+	vcpu_regs_set(vm, vcpu_id, &regs);
 
-	vcpu_sregs_get(vm, vcpuid, &sregs);
+	vcpu_sregs_get(vm, vcpu_id, &sregs);
 	sregs.crs[0] |= 0x00040000;		/* Enable floating point regs */
 	sregs.crs[1] = vm->pgd | 0xf;		/* Primary region table */
-	vcpu_sregs_set(vm, vcpuid, &sregs);
+	vcpu_sregs_set(vm, vcpu_id, &sregs);
 
-	run = vcpu_state(vm, vcpuid);
+	run = vcpu_state(vm, vcpu_id);
 	run->psw_mask = 0x0400000180000000ULL;  /* DAT enabled + 64 bit mode */
 	run->psw_addr = (uintptr_t)guest_code;
+
+	return vcpu;
 }
 
 void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)

tools/testing/selftests/kvm/lib/x86_64/processor.c

@@ -632,29 +632,33 @@ void vm_xsave_req_perm(int bit)
 		    bitmask);
 }
 
-void vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
+struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
+				  void *guest_code)
 {
 	struct kvm_mp_state mp_state;
 	struct kvm_regs regs;
 	vm_vaddr_t stack_vaddr;
+	struct kvm_vcpu *vcpu;
+
 	stack_vaddr = vm_vaddr_alloc(vm, DEFAULT_STACK_PGS * getpagesize(),
 				     DEFAULT_GUEST_STACK_VADDR_MIN);
 
-	/* Create VCPU */
-	vm_vcpu_add(vm, vcpuid);
-	vcpu_set_cpuid(vm, vcpuid, kvm_get_supported_cpuid());
-	vcpu_setup(vm, vcpuid);
+	vcpu = vm_vcpu_add(vm, vcpu_id);
+	vcpu_set_cpuid(vm, vcpu_id, kvm_get_supported_cpuid());
+	vcpu_setup(vm, vcpu_id);
 
 	/* Setup guest general purpose registers */
-	vcpu_regs_get(vm, vcpuid, &regs);
+	vcpu_regs_get(vm, vcpu_id, &regs);
 	regs.rflags = regs.rflags | 0x2;
 	regs.rsp = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize());
 	regs.rip = (unsigned long) guest_code;
-	vcpu_regs_set(vm, vcpuid, &regs);
+	vcpu_regs_set(vm, vcpu_id, &regs);
 
 	/* Setup the MP state */
 	mp_state.mp_state = 0;
-	vcpu_mp_state_set(vm, vcpuid, &mp_state);
+	vcpu_mp_state_set(vm, vcpu_id, &mp_state);
+
+	return vcpu;
 }
 
 /*

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

@@ -369,10 +369,8 @@ static void test_pmu_config_disable(void (*guest_code)(void))
 
 	vm_enable_cap(vm, KVM_CAP_PMU_CAPABILITY, KVM_PMU_CAP_DISABLE);
 
-	vm_vcpu_add_default(vm, 0, guest_code);
+	vcpu = vm_vcpu_add_default(vm, 0, guest_code);
 	vm_init_descriptor_tables(vm);
-
-	vcpu = vcpu_get(vm, 0);
 	vcpu_init_descriptor_tables(vm, vcpu->id);
 
 	TEST_ASSERT(!sanity_check_pmu(vcpu),

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

@@ -54,8 +54,7 @@ static void *run_vcpu(void *_cpu_nr)
 	/* The kernel is fine, but vm_vcpu_add_default() needs locking */
 	pthread_spin_lock(&create_lock);
 
-	vm_vcpu_add_default(vm, vcpu_id, guest_code);
-	vcpu = vcpu_get(vm, vcpu_id);
+	vcpu = vm_vcpu_add_default(vm, vcpu_id, guest_code);
 
 	if (!first_cpu_done) {
 		first_cpu_done = true;