Messages in this thread | | | Subject | Re: [PATCH v21 01/29] LoongArch: KVM: Add kvm related header files | From | zhaotianrui <> | 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 >>>>
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