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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
*/
#ifndef __ASM_LOONGARCH_KVM_HOST_H__
#define __ASM_LOONGARCH_KVM_HOST_H__
#include <linux/cpumask.h>
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/kvm.h>
#include <linux/kvm_types.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/threads.h>
#include <linux/types.h>
#include <asm/inst.h>
#include <asm/kvm_mmu.h>
#include <asm/loongarch.h>
/* Loongarch KVM register ids */
#define KVM_GET_IOC_CSR_IDX(id) ((id & KVM_CSR_IDX_MASK) >> LOONGARCH_REG_SHIFT)
#define KVM_GET_IOC_CPUCFG_IDX(id) ((id & KVM_CPUCFG_IDX_MASK) >> LOONGARCH_REG_SHIFT)
#define KVM_MAX_VCPUS 256
#define KVM_MAX_CPUCFG_REGS 21
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 0
#define KVM_HALT_POLL_NS_DEFAULT 500000
struct kvm_vm_stat {
struct kvm_vm_stat_generic generic;
u64 pages;
u64 hugepages;
};
struct kvm_vcpu_stat {
struct kvm_vcpu_stat_generic generic;
u64 int_exits;
u64 idle_exits;
u64 cpucfg_exits;
u64 signal_exits;
};
#define KVM_MEM_HUGEPAGE_CAPABLE (1UL << 0)
#define KVM_MEM_HUGEPAGE_INCAPABLE (1UL << 1)
struct kvm_arch_memory_slot {
unsigned long flags;
};
struct kvm_context {
unsigned long vpid_cache;
struct kvm_vcpu *last_vcpu;
};
struct kvm_world_switch {
int (*exc_entry)(void);
int (*enter_guest)(struct kvm_run *run, struct kvm_vcpu *vcpu);
unsigned long page_order;
};
#define MAX_PGTABLE_LEVELS 4
struct kvm_arch {
/* Guest physical mm */
kvm_pte_t *pgd;
unsigned long gpa_size;
unsigned long invalid_ptes[MAX_PGTABLE_LEVELS];
unsigned int pte_shifts[MAX_PGTABLE_LEVELS];
unsigned int root_level;
s64 time_offset;
struct kvm_context __percpu *vmcs;
};
#define CSR_MAX_NUMS 0x800
struct loongarch_csrs {
unsigned long csrs[CSR_MAX_NUMS];
};
/* Resume Flags */
#define RESUME_HOST 0
#define RESUME_GUEST 1
enum emulation_result {
EMULATE_DONE, /* no further processing */
EMULATE_DO_MMIO, /* kvm_run filled with MMIO request */
EMULATE_DO_IOCSR, /* handle IOCSR request */
EMULATE_FAIL, /* can't emulate this instruction */
EMULATE_EXCEPT, /* A guest exception has been generated */
};
#define KVM_LARCH_FPU (0x1 << 0)
#define KVM_LARCH_LSX (0x1 << 1)
#define KVM_LARCH_LASX (0x1 << 2)
#define KVM_LARCH_SWCSR_LATEST (0x1 << 3)
#define KVM_LARCH_HWCSR_USABLE (0x1 << 4)
struct kvm_vcpu_arch {
/*
* Switch pointer-to-function type to unsigned long
* for loading the value into register directly.
*/
unsigned long host_eentry;
unsigned long guest_eentry;
/* Pointers stored here for easy accessing from assembly code */
int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
/* Host registers preserved across guest mode execution */
unsigned long host_sp;
unsigned long host_tp;
unsigned long host_pgd;
/* Host CSRs are used when handling exits from guest */
unsigned long badi;
unsigned long badv;
unsigned long host_ecfg;
unsigned long host_estat;
unsigned long host_percpu;
/* GPRs */
unsigned long gprs[32];
unsigned long pc;
/* Which auxiliary state is loaded (KVM_LARCH_*) */
unsigned int aux_inuse;
/* FPU state */
struct loongarch_fpu fpu FPU_ALIGN;
/* CSR state */
struct loongarch_csrs *csr;
/* GPR used as IO source/target */
u32 io_gpr;
/* KVM register to control count timer */
u32 count_ctl;
struct hrtimer swtimer;
/* Bitmask of intr that are pending */
unsigned long irq_pending;
/* Bitmask of pending intr to be cleared */
unsigned long irq_clear;
/* Bitmask of exceptions that are pending */
unsigned long exception_pending;
unsigned int esubcode;
/* Cache for pages needed inside spinlock regions */
struct kvm_mmu_memory_cache mmu_page_cache;
/* vcpu's vpid */
u64 vpid;
/* Frequency of stable timer in Hz */
u64 timer_mhz;
ktime_t expire;
/* Last CPU the vCPU state was loaded on */
int last_sched_cpu;
/* mp state */
struct kvm_mp_state mp_state;
/* cpucfg */
u32 cpucfg[KVM_MAX_CPUCFG_REGS];
};
static inline unsigned long readl_sw_gcsr(struct loongarch_csrs *csr, int reg)
{
return csr->csrs[reg];
}
static inline void writel_sw_gcsr(struct loongarch_csrs *csr, int reg, unsigned long val)
{
csr->csrs[reg] = val;
}
static inline bool kvm_guest_has_fpu(struct kvm_vcpu_arch *arch)
{
return arch->cpucfg[2] & CPUCFG2_FP;
}
static inline bool kvm_guest_has_lsx(struct kvm_vcpu_arch *arch)
{
return arch->cpucfg[2] & CPUCFG2_LSX;
}
static inline bool kvm_guest_has_lasx(struct kvm_vcpu_arch *arch)
{
return arch->cpucfg[2] & CPUCFG2_LASX;
}
/* Debug: dump vcpu state */
int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
/* MMU handling */
void kvm_flush_tlb_all(void);
void kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa);
int kvm_handle_mm_fault(struct kvm_vcpu *vcpu, unsigned long badv, bool write);
void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end, bool blockable);
int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
static inline void update_pc(struct kvm_vcpu_arch *arch)
{
arch->pc += 4;
}
/*
* kvm_is_ifetch_fault() - Find whether a TLBL exception is due to ifetch fault.
* @vcpu: Virtual CPU.
*
* Returns: Whether the TLBL exception was likely due to an instruction
* fetch fault rather than a data load fault.
*/
static inline bool kvm_is_ifetch_fault(struct kvm_vcpu_arch *arch)
{
return arch->pc == arch->badv;
}
/* Misc */
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) {}
void kvm_check_vpid(struct kvm_vcpu *vcpu);
enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer);
void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm, const struct kvm_memory_slot *memslot);
void kvm_init_vmcs(struct kvm *kvm);
void kvm_exc_entry(void);
int kvm_enter_guest(struct kvm_run *run, struct kvm_vcpu *vcpu);
extern unsigned long vpid_mask;
extern const unsigned long kvm_exception_size;
extern const unsigned long kvm_enter_guest_size;
extern struct kvm_world_switch *kvm_loongarch_ops;
#define SW_GCSR (1 << 0)
#define HW_GCSR (1 << 1)
#define INVALID_GCSR (1 << 2)
int get_gcsr_flag(int csr);
void set_hw_gcsr(int csr_id, unsigned long val);
#endif /* __ASM_LOONGARCH_KVM_HOST_H__ */