LoongArch: KVM: Add kvm related header files (b37e6b68) · Commits · git / linux-nf

arch/loongarch/include/asm/kvm_host.h

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		/* 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/hrtimer.h>
		#include <linux/interrupt.h>
		#include <linux/kvm.h>
		#include <linux/kvm_types.h>
		#include <linux/mutex.h>
		#include <linux/spinlock.h>
		#include <linux/threads.h>
		#include <linux/types.h>

		#include <asm/inst.h>
		#include <asm/kvm_mmu.h>
		#include <asm/loongarch.h>

		/* Loongarch KVM register ids */
		#define KVM_GET_IOC_CSR_IDX(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 int_exits;
		u64 idle_exits;
		u64 cpucfg_exits;
		u64 signal_exits;
		};

		struct kvm_arch_memory_slot {
		};

		struct kvm_context {
		unsigned long vpid_cache;
		struct kvm_vcpu *last_vcpu;
		};

		struct kvm_world_switch {
		int (*exc_entry)(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_DO_IOCSR, /* handle IOCSR request */
		EMULATE_FAIL, /* can't emulate this instruction */
		EMULATE_EXCEPT, /* A guest exception has been generated */
		};

		#define KVM_LARCH_FPU (0x1 << 0)
		#define KVM_LARCH_SWCSR_LATEST (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;

		/* KVM register to control count timer */
		u32 count_ctl;
		struct hrtimer swtimer;

		/* 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 esubcode;

		/* 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;

		/* 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;
		}

		/* Debug: dump vcpu state */
		int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);

		/* MMU handling */
		void kvm_flush_tlb_all(void);
		void kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa);
		int kvm_handle_mm_fault(struct kvm_vcpu *vcpu, unsigned long badv, bool write);

		#define KVM_ARCH_WANT_MMU_NOTIFIER
		void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
		int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end, bool blockable);
		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);
		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_exc_entry(void);
		int kvm_enter_guest(struct kvm_run run, struct kvm_vcpu vcpu);

		extern unsigned long vpid_mask;
		extern const unsigned long kvm_exception_size;
		extern const unsigned long kvm_enter_guest_size;
		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);
		void set_hw_gcsr(int csr_id, unsigned long val);

		#endif /* __ASM_LOONGARCH_KVM_HOST_H__ */

arch/loongarch/include/asm/kvm_types.h

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		/* 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 */

arch/loongarch/include/uapi/asm/kvm.h

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		/* 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_FPSIMD (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 \| 1)
		#define KVM_REG_LOONGARCH_VCPU_RESET (KVM_REG_LOONGARCH_KVM \| KVM_REG_SIZE_U64 \| 2)

		#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 */

include/uapi/linux/kvm.h

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		@@ -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