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    Subject[PATCH v19 01/30] LoongArch: KVM: Add kvm related header files
    Date
    Add LoongArch KVM related header files, including kvm.h,
    kvm_host.h, kvm_types.h. All of those are about LoongArch
    virtualization features and kvm interfaces.

    Reviewed-by: Bibo Mao <maobibo@loongson.cn>
    Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
    ---
    arch/loongarch/include/asm/kvm_host.h | 238 +++++++++++++++++++++++++
    arch/loongarch/include/asm/kvm_types.h | 11 ++
    arch/loongarch/include/uapi/asm/kvm.h | 101 +++++++++++
    include/uapi/linux/kvm.h | 9 +
    4 files changed, 359 insertions(+)
    create mode 100644 arch/loongarch/include/asm/kvm_host.h
    create mode 100644 arch/loongarch/include/asm/kvm_types.h
    create mode 100644 arch/loongarch/include/uapi/asm/kvm.h

    diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
    new file mode 100644
    index 000000000000..9f23ddaaae65
    --- /dev/null
    +++ b/arch/loongarch/include/asm/kvm_host.h
    @@ -0,0 +1,238 @@
    +/* 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/mutex.h>
    +#include <linux/hrtimer.h>
    +#include <linux/interrupt.h>
    +#include <linux/types.h>
    +#include <linux/kvm.h>
    +#include <linux/kvm_types.h>
    +#include <linux/threads.h>
    +#include <linux/spinlock.h>
    +
    +#include <asm/inst.h>
    +#include <asm/loongarch.h>
    +
    +/* Loongarch KVM register ids */
    +#define LOONGARCH_CSR_32(_R, _S) \
    + (KVM_REG_LOONGARCH_CSR | KVM_REG_SIZE_U32 | (8 * (_R) + (_S)))
    +
    +#define LOONGARCH_CSR_64(_R, _S) \
    + (KVM_REG_LOONGARCH_CSR | KVM_REG_SIZE_U64 | (8 * (_R) + (_S)))
    +
    +#define KVM_IOC_CSRID(id) LOONGARCH_CSR_64(id, 0)
    +#define KVM_GET_IOC_CSRIDX(id) ((id & KVM_CSR_IDX_MASK) >> 3)
    +
    +#define KVM_MAX_VCPUS 256
    +/* 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;
    +};
    +
    +struct kvm_vcpu_stat {
    + struct kvm_vcpu_stat_generic generic;
    + u64 idle_exits;
    + u64 signal_exits;
    + u64 int_exits;
    + u64 cpucfg_exits;
    +};
    +
    +struct kvm_arch_memory_slot {
    +};
    +
    +struct kvm_context {
    + unsigned long vpid_cache;
    + struct kvm_vcpu *last_vcpu;
    +};
    +
    +struct kvm_world_switch {
    + int (*guest_eentry)(void);
    + int (*enter_guest)(struct kvm_run *run, struct kvm_vcpu *vcpu);
    + unsigned long page_order;
    +};
    +
    +struct kvm_arch {
    + /* Guest physical mm */
    + pgd_t *pgd;
    + unsigned long gpa_size;
    +
    + 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_FAIL, /* can't emulate this instruction */
    + EMULATE_EXCEPT, /* A guest exception has been generated */
    + EMULATE_DO_IOCSR, /* handle IOCSR request */
    +};
    +
    +#define KVM_LARCH_CSR (0x1 << 1)
    +#define KVM_LARCH_FPU (0x1 << 0)
    +
    +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_LOONGARCH_AUX_*) */
    + 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;
    +
    + struct hrtimer swtimer;
    + /* KVM register to control count timer */
    + u32 count_ctl;
    +
    + /* Bitmask of exceptions that are pending */
    + unsigned long irq_pending;
    + /* Bitmask of pending exceptions to be cleared */
    + unsigned long irq_clear;
    +
    + /* 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;
    +
    + u64 core_ext_ioisr[4];
    +
    + /* Last CPU the vCPU state was loaded on */
    + int last_sched_cpu;
    + /* mp state */
    + struct kvm_mp_state mp_state;
    +};
    +
    +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;
    +}
    +
    +/* Helpers */
    +static inline bool _kvm_guest_has_fpu(struct kvm_vcpu_arch *arch)
    +{
    + return cpu_has_fpu;
    +}
    +
    +void _kvm_init_fault(void);
    +
    +/* Debug: dump vcpu state */
    +int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
    +
    +/* MMU handling */
    +int kvm_handle_mm_fault(struct kvm_vcpu *vcpu, unsigned long badv, bool write);
    +void kvm_flush_tlb_all(void);
    +void _kvm_destroy_mm(struct kvm *kvm);
    +pgd_t *kvm_pgd_alloc(void);
    +
    +#define KVM_ARCH_WANT_MMU_NOTIFIER
    +int kvm_unmap_hva_range(struct kvm *kvm,
    + unsigned long start, unsigned long end, bool blockable);
    +void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
    +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_vmid(struct kvm_vcpu *vcpu);
    +enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer);
    +int kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa);
    +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_vector_entry(void);
    +int kvm_enter_guest(struct kvm_run *run, struct kvm_vcpu *vcpu);
    +extern const unsigned long kvm_vector_size;
    +extern const unsigned long kvm_enter_guest_size;
    +extern unsigned long vpid_mask;
    +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);
    +extern void set_hw_gcsr(int csr_id, unsigned long val);
    +#endif /* __ASM_LOONGARCH_KVM_HOST_H__ */
    diff --git a/arch/loongarch/include/asm/kvm_types.h b/arch/loongarch/include/asm/kvm_types.h
    new file mode 100644
    index 000000000000..2fe1d4bdff66
    --- /dev/null
    +++ b/arch/loongarch/include/asm/kvm_types.h
    @@ -0,0 +1,11 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +/*
    + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
    + */
    +
    +#ifndef _ASM_LOONGARCH_KVM_TYPES_H
    +#define _ASM_LOONGARCH_KVM_TYPES_H
    +
    +#define KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE 40
    +
    +#endif /* _ASM_LOONGARCH_KVM_TYPES_H */
    diff --git a/arch/loongarch/include/uapi/asm/kvm.h b/arch/loongarch/include/uapi/asm/kvm.h
    new file mode 100644
    index 000000000000..7ec2f34018c4
    --- /dev/null
    +++ b/arch/loongarch/include/uapi/asm/kvm.h
    @@ -0,0 +1,101 @@
    +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
    +/*
    + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
    + */
    +
    +#ifndef __UAPI_ASM_LOONGARCH_KVM_H
    +#define __UAPI_ASM_LOONGARCH_KVM_H
    +
    +#include <linux/types.h>
    +
    +/*
    + * KVM Loongarch specific structures and definitions.
    + *
    + * Some parts derived from the x86 version of this file.
    + */
    +
    +#define __KVM_HAVE_READONLY_MEM
    +
    +#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
    +#define KVM_DIRTY_LOG_PAGE_OFFSET 64
    +
    +/*
    + * for KVM_GET_REGS and KVM_SET_REGS
    + */
    +struct kvm_regs {
    + /* out (KVM_GET_REGS) / in (KVM_SET_REGS) */
    + __u64 gpr[32];
    + __u64 pc;
    +};
    +
    +/*
    + * for KVM_GET_FPU and KVM_SET_FPU
    + */
    +struct kvm_fpu {
    + __u32 fcsr;
    + __u64 fcc; /* 8x8 */
    + struct kvm_fpureg {
    + __u64 val64[4];
    + } fpr[32];
    +};
    +
    +/*
    + * For LoongArch, we use KVM_SET_ONE_REG and KVM_GET_ONE_REG to access various
    + * registers. The id field is broken down as follows:
    + *
    + * bits[63..52] - As per linux/kvm.h
    + * bits[51..32] - Must be zero.
    + * bits[31..16] - Register set.
    + *
    + * Register set = 0: GP registers from kvm_regs (see definitions below).
    + *
    + * Register set = 1: CSR registers.
    + *
    + * Register set = 2: KVM specific registers (see definitions below).
    + *
    + * Register set = 3: FPU / SIMD registers (see definitions below).
    + *
    + * Other sets registers may be added in the future. Each set would
    + * have its own identifier in bits[31..16].
    + */
    +
    +#define KVM_REG_LOONGARCH_GPR (KVM_REG_LOONGARCH | 0x00000ULL)
    +#define KVM_REG_LOONGARCH_CSR (KVM_REG_LOONGARCH | 0x10000ULL)
    +#define KVM_REG_LOONGARCH_KVM (KVM_REG_LOONGARCH | 0x20000ULL)
    +#define KVM_REG_LOONGARCH_FPU (KVM_REG_LOONGARCH | 0x30000ULL)
    +#define KVM_REG_LOONGARCH_MASK (KVM_REG_LOONGARCH | 0x30000ULL)
    +#define KVM_CSR_IDX_MASK (0x10000 - 1)
    +
    +/*
    + * KVM_REG_LOONGARCH_KVM - KVM specific control registers.
    + */
    +
    +#define KVM_REG_LOONGARCH_COUNTER (KVM_REG_LOONGARCH_KVM | KVM_REG_SIZE_U64 | 3)
    +#define KVM_REG_LOONGARCH_VCPU_RESET (KVM_REG_LOONGARCH_KVM | KVM_REG_SIZE_U64 | 4)
    +
    +struct kvm_debug_exit_arch {
    +};
    +
    +/* for KVM_SET_GUEST_DEBUG */
    +struct kvm_guest_debug_arch {
    +};
    +
    +/* definition of registers in kvm_run */
    +struct kvm_sync_regs {
    +};
    +
    +/* dummy definition */
    +struct kvm_sregs {
    +};
    +
    +struct kvm_iocsr_entry {
    + __u32 addr;
    + __u32 pad;
    + __u64 data;
    +};
    +
    +#define KVM_NR_IRQCHIPS 1
    +#define KVM_IRQCHIP_NUM_PINS 64
    +#define KVM_MAX_CORES 256
    +
    +#endif /* __UAPI_ASM_LOONGARCH_KVM_H */
    diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
    index f089ab290978..1184171224b3 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -264,6 +264,7 @@ struct kvm_xen_exit {
    #define KVM_EXIT_RISCV_SBI 35
    #define KVM_EXIT_RISCV_CSR 36
    #define KVM_EXIT_NOTIFY 37
    +#define KVM_EXIT_LOONGARCH_IOCSR 38

    /* For KVM_EXIT_INTERNAL_ERROR */
    /* Emulate instruction failed. */
    @@ -336,6 +337,13 @@ struct kvm_run {
    __u32 len;
    __u8 is_write;
    } mmio;
    + /* KVM_EXIT_LOONGARCH_IOCSR */
    + struct {
    + __u64 phys_addr;
    + __u8 data[8];
    + __u32 len;
    + __u8 is_write;
    + } iocsr_io;
    /* KVM_EXIT_HYPERCALL */
    struct {
    __u64 nr;
    @@ -1362,6 +1370,7 @@ struct kvm_dirty_tlb {
    #define KVM_REG_ARM64 0x6000000000000000ULL
    #define KVM_REG_MIPS 0x7000000000000000ULL
    #define KVM_REG_RISCV 0x8000000000000000ULL
    +#define KVM_REG_LOONGARCH 0x9000000000000000ULL

    #define KVM_REG_SIZE_SHIFT 52
    #define KVM_REG_SIZE_MASK 0x00f0000000000000ULL
    --
    2.39.1
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