by zhaotianrui

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Subject: Re: [PATCH v8 01/30] LoongArch: KVM: Add kvm related header files

在 2023年05月06日 16:20, Huacai Chen 写道:
> Hi, Tianrui,
>
> On Thu, Apr 27, 2023 at 3:11 PM Tianrui Zhao <[email protected]> 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.
>>
>> Signed-off-by: Tianrui Zhao <[email protected]>
>> ---
>> arch/loongarch/include/asm/cpu-features.h | 22 ++
>> arch/loongarch/include/asm/cpu-info.h | 10 +
>> arch/loongarch/include/asm/kvm_host.h | 254 ++++++++++++++++++++++
>> arch/loongarch/include/asm/kvm_types.h | 11 +
>> arch/loongarch/include/uapi/asm/kvm.h | 107 +++++++++
>> include/uapi/linux/kvm.h | 9 +
>> 6 files changed, 413 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/cpu-features.h b/arch/loongarch/include/asm/cpu-features.h
>> index f6177f133477..fbc5b4f202aa 100644
>> --- a/arch/loongarch/include/asm/cpu-features.h
>> +++ b/arch/loongarch/include/asm/cpu-features.h
>> @@ -65,5 +65,27 @@
>> #define cpu_has_guestid cpu_opt(LOONGARCH_CPU_GUESTID)
>> #define cpu_has_hypervisor cpu_opt(LOONGARCH_CPU_HYPERVISOR)
>>
>> +#define cpu_has_matc_guest (cpu_data[0].guest_cfg & BIT(0))
>> +#define cpu_has_matc_root (cpu_data[0].guest_cfg & BIT(1))
>> +#define cpu_has_matc_nest (cpu_data[0].guest_cfg & BIT(2))
>> +#define cpu_has_sitp (cpu_data[0].guest_cfg & BIT(6))
>> +#define cpu_has_titp (cpu_data[0].guest_cfg & BIT(8))
>> +#define cpu_has_toep (cpu_data[0].guest_cfg & BIT(10))
>> +#define cpu_has_topp (cpu_data[0].guest_cfg & BIT(12))
>> +#define cpu_has_torup (cpu_data[0].guest_cfg & BIT(14))
>> +#define cpu_has_gcip_all (cpu_data[0].guest_cfg & BIT(16))
>> +#define cpu_has_gcip_hit (cpu_data[0].guest_cfg & BIT(17))
>> +#define cpu_has_gcip_secure (cpu_data[0].guest_cfg & BIT(18))
>> +
>> +/*
>> + * Guest capabilities
>> + */
>> +#define cpu_guest_has_conf1 (cpu_data[0].guest.conf & BIT(1))
>> +#define cpu_guest_has_conf2 (cpu_data[0].guest.conf & BIT(2))
>> +#define cpu_guest_has_conf3 (cpu_data[0].guest.conf & BIT(3))
>> +#define cpu_guest_has_fpu (cpu_data[0].guest.options & LOONGARCH_CPU_FPU)
>> +#define cpu_guest_has_perf (cpu_data[0].guest.options & LOONGARCH_CPU_PMP)
>> +#define cpu_guest_has_watch (cpu_data[0].guest.options & LOONGARCH_CPU_WATCH)
>> +#define cpu_guest_has_lsx (cpu_data[0].guest.options & LOONGARCH_CPU_LSX)
>>
>> #endif /* __ASM_CPU_FEATURES_H */
>> diff --git a/arch/loongarch/include/asm/cpu-info.h b/arch/loongarch/include/asm/cpu-info.h
>> index cd73a6f57fe3..0b9119c2b29d 100644
>> --- a/arch/loongarch/include/asm/cpu-info.h
>> +++ b/arch/loongarch/include/asm/cpu-info.h
>> @@ -32,6 +32,13 @@ struct cache_desc {
>> #define CACHE_LEVEL_MAX 3
>> #define CACHE_LEAVES_MAX 6
>>
>> +struct guest_info {
>> + unsigned long options;
>> + unsigned long options_dyn;
>> + unsigned char conf;
>> + unsigned int kscratch_mask;
>> +};
>> +
>> struct cpuinfo_loongarch {
>> u64 asid_cache;
>> unsigned long asid_mask;
>> @@ -60,6 +67,9 @@ struct cpuinfo_loongarch {
>> unsigned int watch_dreg_count; /* Number data breakpoints */
>> unsigned int watch_ireg_count; /* Number instruction breakpoints */
>> unsigned int watch_reg_use_cnt; /* min(NUM_WATCH_REGS, watch_dreg_count + watch_ireg_count), Usable by ptrace */
>> + /* VZ & Guest features */
>> + struct guest_info guest;
>> + unsigned long guest_cfg;
>> } __aligned(SMP_CACHE_BYTES);
>>
>> extern struct cpuinfo_loongarch cpu_data[];
>> diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
>> new file mode 100644
>> index 000000000000..6f72245f4e85
>> --- /dev/null
>> +++ b/arch/loongarch/include/asm/kvm_host.h
>> @@ -0,0 +1,254 @@
>> +/* 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 */
>> + struct mm_struct gpa_mm;
>> + /* Mask of CPUs needing GPA ASID flush */
>> + cpumask_t asid_flush_mask;
>> +
>> + unsigned char online_vcpus;
>> + unsigned char is_migrate;
>> + s64 time_offset;
>> + struct kvm_context __percpu *vmcs;
>> + unsigned long gpa_size;
>> +};
>> +
>> +#define CSR_MAX_NUMS 0x800
>> +
>> +struct loongarch_csrs {
>> + unsigned long csrs[CSR_MAX_NUMS];
>> +};
>> +
>> +/* Resume Flags */
>> +#define RESUME_GUEST 1
>> +#define RESUME_HOST 0
>> +
>> +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_WAIT, /* WAIT 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)
>> +
>> +struct kvm_vcpu_arch {
>> + /*
>> + * Switch pointer-to-function type to unsigned long
>> + * for loading the value into register directly.
>> + */
>> + unsigned long guest_eentry;
>> + unsigned long host_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_stack;
>> + unsigned long host_gp;
>> + unsigned long host_pgd;
>> + unsigned long host_pgdhi;
>> + unsigned long host_entryhi;
> I can't find that host_pgdhi and host_entryhi be used in this series,
> and I don't know whether they will be used in future.
The two variables are not used, and I will remove them.

Thanks
Tianrui Zhao
>
>> +
>> + /* Host CSRs are used when handling exits from guest */
>> + unsigned long badv;
>> + unsigned long host_estat;
>> + unsigned long badi;
>> + unsigned long host_ecfg;
>> + unsigned long host_percpu;
> If they are in badi, badv, host_ecfg, host_estat, host_percpu order, I
> think that is better.
>
>
> Huacai
Thanks, I will reorder these to make them better.

Thanks
Tianrui Zhao
>
>> +
>> + /* GPRs */
>> + unsigned long gprs[32];
>> + unsigned long pc;
>> +
>> + /* FPU state */
>> + struct loongarch_fpu fpu FPU_ALIGN;
>> + /* Which auxiliary state is loaded (KVM_LOONGARCH_AUX_*) */
>> + unsigned int aux_inuse;
>> +
>> + /* 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;
>> +
>> + /* Period of stable timer tick in ns */
>> + u64 timer_period_ns;
>> + /* Frequency of stable timer in Hz */
>> + u64 timer_mhz;
>> + /* Stable bias from the raw time */
>> + u64 timer_bias;
>> + /* Dynamic nanosecond bias (multiple of timer_period_ns) to avoid overflow */
>> + s64 timer_dyn_bias;
>> +
>> + ktime_t stable_ktime_saved;
>> +
>> + u64 core_ext_ioisr[4];
>> +
>> + /* Last CPU the vCPU state was loaded on */
>> + int last_sched_cpu;
>> + /* Last CPU the vCPU actually executed guest code on */
>> + int last_exec_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, int cpu);
>> +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)
>> +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..060647b5fe2e
>> --- /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 4
>> +
>> +#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..2fc3baac2ecd
>> --- /dev/null
>> +++ b/arch/loongarch/include/uapi/asm/kvm.h
>> @@ -0,0 +1,107 @@
>> +/* 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
>> +
>> +/*
>> + * 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;
>> + __u32 none;
>> + __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_GP (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;
>> +};
>> +
>> +struct kvm_loongarch_interrupt {
>> + /* in */
>> + __u32 cpu;
>> + __u32 irq;
>> +};
>> +
>> +#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 d77aef872a0a..d14fde87ae35 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;
>> @@ -1354,6 +1362,7 @@ 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
>> --
>> 2.31.1
>>