Date:   Mon, 5 Jun 2023 20:22:27 +0800
From:   "bibo, mao" <maobibo@...ngson.cn>
To:     Tianrui Zhao <zhaotianrui@...ngson.cn>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
        Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Xi Ruoyao <xry111@...111.site>
Subject: Re: [PATCH v12 01/31] LoongArch: KVM: Add kvm related header files

Reviewed-by: Bibo Mao <maobibo@...ngson.cn>

在 2023/5/30 09:51, Tianrui Zhao 写道:
> 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 <zhaotianrui@...ngson.cn>
> ---
>  arch/loongarch/include/asm/cpu-features.h |  22 ++
>  arch/loongarch/include/asm/cpu-info.h     |  10 +
>  arch/loongarch/include/asm/kvm_host.h     | 252 ++++++++++++++++++++++
>  arch/loongarch/include/asm/kvm_types.h    |  11 +
>  arch/loongarch/include/uapi/asm/kvm.h     | 106 +++++++++
>  include/uapi/linux/kvm.h                  |   9 +
>  6 files changed, 410 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..a357912caa45
> --- /dev/null
> +++ b/arch/loongarch/include/asm/kvm_host.h
> @@ -0,0 +1,252 @@
> +/* 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;
> +
> +	/* 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;
> +
> +	/* 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..3ccadb73ad8d
> --- /dev/null
> +++ b/arch/loongarch/include/uapi/asm/kvm.h
> @@ -0,0 +1,106 @@
> +/* 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;
> +	__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 737318b1c1d9..74d9766277e7 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;
> @@ -1360,6 +1368,7 @@ 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

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