ARK-OS/arkos/kernel/arch/loongarch/include/asm/kvm_vcpu.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
 */

#ifndef __ASM_LOONGARCH_KVM_VCPU_H__
#define __ASM_LOONGARCH_KVM_VCPU_H__

#include <linux/kvm_host.h>
#include <asm/loongarch.h>

/* Controlled by 0x5 guest estat */
#define CPU_SIP0			(_ULCAST_(1))
#define CPU_SIP1			(_ULCAST_(1) << 1)
#define CPU_PMU				(_ULCAST_(1) << 10)
#define CPU_TIMER			(_ULCAST_(1) << 11)
#define CPU_IPI				(_ULCAST_(1) << 12)
#define CPU_AVEC                        (_ULCAST_(1) << 14)

/* Controlled by 0x52 guest exception VIP aligned to estat bit 5~12 */
#define CPU_IP0				(_ULCAST_(1))
#define CPU_IP1				(_ULCAST_(1) << 1)
#define CPU_IP2				(_ULCAST_(1) << 2)
#define CPU_IP3				(_ULCAST_(1) << 3)
#define CPU_IP4				(_ULCAST_(1) << 4)
#define CPU_IP5				(_ULCAST_(1) << 5)
#define CPU_IP6				(_ULCAST_(1) << 6)
#define CPU_IP7				(_ULCAST_(1) << 7)

#define MNSEC_PER_SEC			(NSEC_PER_SEC >> 20)

/* KVM_IRQ_LINE irq field index values */
#define KVM_LOONGSON_IRQ_TYPE_SHIFT	24
#define KVM_LOONGSON_IRQ_TYPE_MASK	0xff
#define KVM_LOONGSON_IRQ_VCPU_SHIFT	16
#define KVM_LOONGSON_IRQ_VCPU_MASK	0xff
#define KVM_LOONGSON_IRQ_NUM_SHIFT	0
#define KVM_LOONGSON_IRQ_NUM_MASK	0xffff

typedef union loongarch_instruction  larch_inst;
typedef int (*exit_handle_fn)(struct kvm_vcpu *, int);

int  kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst);
int  kvm_emu_mmio_write(struct kvm_vcpu *vcpu, larch_inst inst);
int  kvm_complete_mmio_read(struct kvm_vcpu *vcpu, struct kvm_run *run);
int  kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run);
int  kvm_complete_user_service(struct kvm_vcpu *vcpu, struct kvm_run *run);
int  kvm_emu_idle(struct kvm_vcpu *vcpu);
int  kvm_pending_timer(struct kvm_vcpu *vcpu);
int  kvm_handle_fault(struct kvm_vcpu *vcpu, int fault);
void kvm_deliver_intr(struct kvm_vcpu *vcpu);
void kvm_deliver_exception(struct kvm_vcpu *vcpu);

void kvm_own_fpu(struct kvm_vcpu *vcpu);
void kvm_lose_fpu(struct kvm_vcpu *vcpu);
void kvm_save_fpu(struct loongarch_fpu *fpu);
void kvm_restore_fpu(struct loongarch_fpu *fpu);
void kvm_restore_fcsr(struct loongarch_fpu *fpu);

#ifdef CONFIG_CPU_HAS_LSX
int kvm_own_lsx(struct kvm_vcpu *vcpu);
void kvm_save_lsx(struct loongarch_fpu *fpu);
void kvm_restore_lsx(struct loongarch_fpu *fpu);
#else
static inline int kvm_own_lsx(struct kvm_vcpu *vcpu) { return -EINVAL; }
static inline void kvm_save_lsx(struct loongarch_fpu *fpu) { }
static inline void kvm_restore_lsx(struct loongarch_fpu *fpu) { }
#endif

#ifdef CONFIG_CPU_HAS_LASX
int kvm_own_lasx(struct kvm_vcpu *vcpu);
void kvm_save_lasx(struct loongarch_fpu *fpu);
void kvm_restore_lasx(struct loongarch_fpu *fpu);
#else
static inline int kvm_own_lasx(struct kvm_vcpu *vcpu) { return -EINVAL; }
static inline void kvm_save_lasx(struct loongarch_fpu *fpu) { }
static inline void kvm_restore_lasx(struct loongarch_fpu *fpu) { }
#endif

#ifdef CONFIG_CPU_HAS_LBT
int kvm_own_lbt(struct kvm_vcpu *vcpu);
#else
static inline int kvm_own_lbt(struct kvm_vcpu *vcpu) { return -EINVAL; }
#endif

void kvm_init_timer(struct kvm_vcpu *vcpu, unsigned long hz);
void kvm_save_timer(struct kvm_vcpu *vcpu);
void kvm_restore_timer(struct kvm_vcpu *vcpu);

int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq);
struct kvm_vcpu *kvm_get_vcpu_by_cpuid(struct kvm *kvm, int cpuid);

/*
 * Loongarch KVM guest interrupt handling
 */
static inline void kvm_queue_irq(struct kvm_vcpu *vcpu, unsigned int irq)
{
	set_bit(irq, &vcpu->arch.irq_pending);
	clear_bit(irq, &vcpu->arch.irq_clear);
}

static inline void kvm_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int irq)
{
	clear_bit(irq, &vcpu->arch.irq_pending);
	set_bit(irq, &vcpu->arch.irq_clear);
}

static inline int kvm_queue_exception(struct kvm_vcpu *vcpu,
			unsigned int code, unsigned int subcode)
{
	/* only one exception can be injected */
	if (!vcpu->arch.exception_pending) {
		set_bit(code, &vcpu->arch.exception_pending);
		vcpu->arch.esubcode = subcode;
		return 0;
	} else
		return -1;
}

static inline unsigned long kvm_read_reg(struct kvm_vcpu *vcpu, int num)
{
	return vcpu->arch.gprs[num];
}

static inline void kvm_write_reg(struct kvm_vcpu *vcpu, int num, unsigned long val)
{
	vcpu->arch.gprs[num] = val;
}

static inline bool kvm_pvtime_supported(void)
{
	return !!sched_info_on();
}

static inline bool kvm_guest_has_pv_feature(struct kvm_vcpu *vcpu, unsigned int feature)
{
	return vcpu->kvm->arch.pv_features & BIT(feature);
}

#endif /* __ASM_LOONGARCH_KVM_VCPU_H__ */