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Subject: Re: [PATCH v21 01/29] LoongArch: KVM: Add kvm related header files
To:     Huacai Chen <chenhuacai@kernel.org>
Cc:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        WANG Xuerui <kernel@xen0n.name>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        loongarch@lists.linux.dev, Jens Axboe <axboe@kernel.dk>,
        Mark Brown <broonie@kernel.org>,
        Alex Deucher <alexander.deucher@amd.com>,
        Oliver Upton <oliver.upton@linux.dev>, maobibo@loongson.cn,
        Xi Ruoyao <xry111@xry111.site>
References: <20230915014949.1222777-1-zhaotianrui@loongson.cn>
 <20230915014949.1222777-2-zhaotianrui@loongson.cn>
 <CAAhV-H7_GKRvzPWjs4skgskC9GJJXUQsBwYmXaMR3hvWoMbvJg@mail.gmail.com>
 <cce5b65d-1fb4-2c79-9b32-687613288edf@loongson.cn>
 <CAAhV-H4y-ynpFrr=daiYg1gCftrBM7iGuzJUguEGB8ct0xiF+w@mail.gmail.com>
From:   zhaotianrui <zhaotianrui@loongson.cn>
Message-ID: <913c2187-46ef-5b12-bc84-c9b60ee89bba@loongson.cn>
Date:   Tue, 19 Sep 2023 10:58:39 +0800
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在 2023/9/18 下午2:37, Huacai Chen 写道:
> On Mon, Sep 18, 2023 at 2:32 PM zhaotianrui <zhaotianrui@loongson.cn> wrote:
>>
>> 在 2023/9/17 下午10:22, Huacai Chen 写道:
>>> Hi, Tianrui,
>>>
>>> On Fri, Sep 15, 2023 at 9:50 AM Tianrui Zhao <zhaotianrui@loongson.cn> wrote:
>>>> 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  | 245 +++++++++++++++++++++++++
>>>>    arch/loongarch/include/asm/kvm_types.h |  11 ++
>>>>    arch/loongarch/include/uapi/asm/kvm.h  | 108 +++++++++++
>>>>    include/uapi/linux/kvm.h               |   9 +
>>>>    4 files changed, 373 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 0000000000..00e0c1876b
>>>> --- /dev/null
>>>> +++ b/arch/loongarch/include/asm/kvm_host.h
>>>> @@ -0,0 +1,245 @@
>>>> +/* 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/kvm_mmu.h>
>>>> +#include <asm/loongarch.h>
>>>> +
>>>> +/* Loongarch KVM register ids */
>>>> +#define KVM_GET_IOC_CSRIDX(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 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;
>>>> +};
>>>> +
>>>> +#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_FAIL,           /* can't emulate this instruction */
>>>> +       EMULATE_EXCEPT,         /* A guest exception has been generated */
>>>> +       EMULATE_DO_IOCSR,       /* handle IOCSR request */
>>>> +};
>>>> +
>>>> +#define KVM_LARCH_FPU          (0x1 << 0)
>>>> +#define KVM_LARCH_CSR          (0x1 << 1)
>>>> +#define KVM_LARCH_HWCSR_USABLE (0x1 << 2)
>>>> +
>>>> +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;
>>>> +
>>>> +       struct hrtimer swtimer;
>>>> +       /* KVM register to control count timer */
>>>> +       u32 count_ctl;
>>>> +
>>>> +       /* 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  subcode;
>>>> +
>>>> +       /* 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;
>>>> +       /* 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;
>>>> +}
>>>> +
>>>> +/* 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);
>>>> +
>>>> +#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_vpid(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 0000000000..2fe1d4bdff
>>>> --- /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 0000000000..fafda487d6
>>>> --- /dev/null
>>>> +++ b/arch/loongarch/include/uapi/asm/kvm.h
>>>> @@ -0,0 +1,108 @@
>>>> +/* 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_CPUCFG       (KVM_REG_LOONGARCH | 0x40000ULL)
>>>> +#define KVM_REG_LOONGARCH_MASK         (KVM_REG_LOONGARCH | 0x70000ULL)
>>>> +#define KVM_CSR_IDX_MASK               0x7fff
>>>> +#define KVM_CPUCFG_IDX_MASK            0x7fff
>>>> +
>>>> +/*
>>>> + * 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)
>>> Why begin with 3? 0, 1, 2 reserved for what?
>> They are keep consistent with our original codes, and 0,1,2 are not used
>> now.
> The same as KVM_REG_LOONGARCH_FPU, kernel is the first one, so I
> suggest beginning with 0 or 1, but don't begin with 3.
>
> Huacai
Thanks for your advice, it is better to change the beginning to 0,1.

Thanks
Tianrui Zhao
>
>> Thanks
>> Tianrui Zhao
>>> Huacai
>>>
>>>> +
>>>> +#define LOONGARCH_REG_SHIFT            3
>>>> +#define LOONGARCH_REG_64(TYPE, REG)    (TYPE | KVM_REG_SIZE_U64 | (REG << LOONGARCH_REG_SHIFT))
>>>> +#define KVM_IOC_CSRID(REG)             LOONGARCH_REG_64(KVM_REG_LOONGARCH_CSR, REG)
>>>> +#define KVM_IOC_CPUCFG(REG)            LOONGARCH_REG_64(KVM_REG_LOONGARCH_CPUCFG, REG)
>>>> +
>>>> +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 13065dd961..863f84619a 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
>>>>