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