/*
 * tools/testing/selftests/kvm/include/kvm_util.h
 *
 * Copyright (C) 2018, Google LLC.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 *
 */
#ifndef SELFTEST_KVM_UTIL_H
#define SELFTEST_KVM_UTIL_H

#include "test_util.h"

#include "asm/kvm.h"
#include "linux/kvm.h"
#include <sys/ioctl.h>

#include "sparsebit.h"


/* Callers of kvm_util only have an incomplete/opaque description of the
 * structure kvm_util is using to maintain the state of a VM.
 */
struct kvm_vm;

typedef uint64_t vm_paddr_t; /* Virtual Machine (Guest) physical address */
typedef uint64_t vm_vaddr_t; /* Virtual Machine (Guest) virtual address */

/* Minimum allocated guest virtual and physical addresses */
#define KVM_UTIL_MIN_VADDR		0x2000

#define DEFAULT_GUEST_PHY_PAGES		512
#define DEFAULT_GUEST_STACK_VADDR_MIN	0xab6000
#define DEFAULT_STACK_PGS		5

enum vm_guest_mode {
	VM_MODE_P52V48_4K,
	VM_MODE_P52V48_64K,
	VM_MODE_P40V48_4K,
	VM_MODE_P40V48_64K,
	NUM_VM_MODES,
};

#define vm_guest_mode_string(m) vm_guest_mode_string[m]
extern const char * const vm_guest_mode_string[];

enum vm_mem_backing_src_type {
	VM_MEM_SRC_ANONYMOUS,
	VM_MEM_SRC_ANONYMOUS_THP,
	VM_MEM_SRC_ANONYMOUS_HUGETLB,
};

int kvm_check_cap(long cap);
int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap);

struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
void kvm_vm_free(struct kvm_vm *vmp);
void kvm_vm_restart(struct kvm_vm *vmp, int perm);
void kvm_vm_release(struct kvm_vm *vmp);
void kvm_vm_get_dirty_log(struct kvm_vm *vm, int slot, void *log);

int kvm_memcmp_hva_gva(void *hva, struct kvm_vm *vm, const vm_vaddr_t gva,
		       size_t len);

void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename,
		     uint32_t data_memslot, uint32_t pgd_memslot);

void vm_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent);
void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid,
	       uint8_t indent);

void vm_create_irqchip(struct kvm_vm *vm);

void vm_userspace_mem_region_add(struct kvm_vm *vm,
	enum vm_mem_backing_src_type src_type,
	uint64_t guest_paddr, uint32_t slot, uint64_t npages,
	uint32_t flags);

void vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long ioctl,
		void *arg);
void vm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags);
void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid, int pgd_memslot,
		 int gdt_memslot);
vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min,
			  uint32_t data_memslot, uint32_t pgd_memslot);
void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
	      size_t size, uint32_t pgd_memslot);
void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa);
void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva);
vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva);
vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva);

struct kvm_run *vcpu_state(struct kvm_vm *vm, uint32_t vcpuid);
void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
void vcpu_set_mp_state(struct kvm_vm *vm, uint32_t vcpuid,
		       struct kvm_mp_state *mp_state);
void vcpu_regs_get(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs);
void vcpu_regs_set(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs);
void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...);
void vcpu_sregs_get(struct kvm_vm *vm, uint32_t vcpuid,
		    struct kvm_sregs *sregs);
void vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid,
		    struct kvm_sregs *sregs);
int _vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid,
		    struct kvm_sregs *sregs);
void vcpu_events_get(struct kvm_vm *vm, uint32_t vcpuid,
		     struct kvm_vcpu_events *events);
void vcpu_events_set(struct kvm_vm *vm, uint32_t vcpuid,
		     struct kvm_vcpu_events *events);

const char *exit_reason_str(unsigned int exit_reason);

void virt_pgd_alloc(struct kvm_vm *vm, uint32_t pgd_memslot);
void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
		 uint32_t pgd_memslot);
vm_paddr_t vm_phy_page_alloc(struct kvm_vm *vm, vm_paddr_t paddr_min,
			     uint32_t memslot);
vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num,
			      vm_paddr_t paddr_min, uint32_t memslot);

struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_size,
				 void *guest_code);
void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code);

struct kvm_userspace_memory_region *
kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
				 uint64_t end);

struct kvm_dirty_log *
allocate_kvm_dirty_log(struct kvm_userspace_memory_region *region);

int vm_create_device(struct kvm_vm *vm, struct kvm_create_device *cd);

#define sync_global_to_guest(vm, g) ({				\
	typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g));	\
	memcpy(_p, &(g), sizeof(g));				\
})

#define sync_global_from_guest(vm, g) ({			\
	typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g));	\
	memcpy(&(g), _p, sizeof(g));				\
})

/* ucall implementation types */
typedef enum {
	UCALL_PIO,
	UCALL_MMIO,
} ucall_type_t;

/* Common ucalls */
enum {
	UCALL_NONE,
	UCALL_SYNC,
	UCALL_ABORT,
	UCALL_DONE,
};

#define UCALL_MAX_ARGS 6

struct ucall {
	uint64_t cmd;
	uint64_t args[UCALL_MAX_ARGS];
};

void ucall_init(struct kvm_vm *vm, ucall_type_t type, void *arg);
void ucall_uninit(struct kvm_vm *vm);
void ucall(uint64_t cmd, int nargs, ...);
uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);

#define GUEST_SYNC(stage)	ucall(UCALL_SYNC, 2, "hello", stage)
#define GUEST_DONE()		ucall(UCALL_DONE, 0)
#define GUEST_ASSERT(_condition) do {			\
	if (!(_condition))				\
		ucall(UCALL_ABORT, 2,			\
			"Failed guest assert: "		\
			#_condition, __LINE__);		\
} while (0)

#endif /* SELFTEST_KVM_UTIL_H */
