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From:   Tianrui Zhao <zhaotianrui@loongson.cn>
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     Huacai Chen <chenhuacai@kernel.org>,
        WANG Xuerui <kernel@xen0n.name>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        loongarch@lists.linux.dev, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, 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>, zhaotianrui@loongson.cn
Subject: [PATCH v8 01/30] LoongArch: KVM: Add kvm related header files
Date:   Thu, 27 Apr 2023 15:10:40 +0800
Message-Id: <20230427071109.3367258-2-zhaotianrui@loongson.cn>
In-Reply-To: <20230427071109.3367258-1-zhaotianrui@loongson.cn>
References: <20230427071109.3367258-1-zhaotianrui@loongson.cn>
MIME-Version: 1.0
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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@loongson.cn>
---
 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;
+
+	/* 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;
+
+	/* 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