arch/arm/include/asm/kvm_host.h - linux - Git at Google

 /*
  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2, as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */

 #ifndef __ARM_KVM_HOST_H__
 #define __ARM_KVM_HOST_H__

 #include <linux/types.h>
 #include <linux/kvm_types.h>
 #include <asm/cputype.h>
 #include <asm/kvm.h>
 #include <asm/kvm_asm.h>
 #include <asm/kvm_mmio.h>
 #include <asm/fpstate.h>
 #include <kvm/arm_arch_timer.h>

 #define __KVM_HAVE_ARCH_INTC_INITIALIZED

 #define KVM_USER_MEM_SLOTS 32
 #define KVM_HAVE_ONE_REG
 #define KVM_HALT_POLL_NS_DEFAULT 500000

 #define KVM_VCPU_MAX_FEATURES 2

 #include <kvm/arm_vgic.h>


 #ifdef CONFIG_ARM_GIC_V3
 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
 #else
 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
 #endif

 #define KVM_REQ_SLEEP \
 	KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 #define KVM_REQ_IRQ_PENDING	KVM_ARCH_REQ(1)

 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);

 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
 int __attribute_const__ kvm_target_cpu(void);
 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);

 struct kvm_arch {
 	/* VTTBR value associated with below pgd and vmid */
 	u64    vttbr;

 	/* The last vcpu id that ran on each physical CPU */
 	int __percpu *last_vcpu_ran;

 	/*
 	 * Anything that is not used directly from assembly code goes
 	 * here.
 	 */

 	/* The VMID generation used for the virt. memory system */
 	u64    vmid_gen;
 	u32    vmid;

 	/* Stage-2 page table */
 	pgd_t *pgd;

 	/* Interrupt controller */
 	struct vgic_dist	vgic;
 	int max_vcpus;

 	/* Mandated version of PSCI */
 	u32 psci_version;
 };

 #define KVM_NR_MEM_OBJS     40

 /*
  * We don't want allocation failures within the mmu code, so we preallocate
  * enough memory for a single page fault in a cache.
  */
 struct kvm_mmu_memory_cache {
 	int nobjs;
 	void *objects[KVM_NR_MEM_OBJS];
 };

 struct kvm_vcpu_fault_info {
 	u32 hsr;		/* Hyp Syndrome Register */
 	u32 hxfar;		/* Hyp Data/Inst. Fault Address Register */
 	u32 hpfar;		/* Hyp IPA Fault Address Register */
 };

 /*
  * 0 is reserved as an invalid value.
  * Order should be kept in sync with the save/restore code.
  */
 enum vcpu_sysreg {
 	__INVALID_SYSREG__,
 	c0_MPIDR,		/* MultiProcessor ID Register */
 	c0_CSSELR,		/* Cache Size Selection Register */
 	c1_SCTLR,		/* System Control Register */
 	c1_ACTLR,		/* Auxiliary Control Register */
 	c1_CPACR,		/* Coprocessor Access Control */
 	c2_TTBR0,		/* Translation Table Base Register 0 */
 	c2_TTBR0_high,		/* TTBR0 top 32 bits */
 	c2_TTBR1,		/* Translation Table Base Register 1 */
 	c2_TTBR1_high,		/* TTBR1 top 32 bits */
 	c2_TTBCR,		/* Translation Table Base Control R. */
 	c3_DACR,		/* Domain Access Control Register */
 	c5_DFSR,		/* Data Fault Status Register */
 	c5_IFSR,		/* Instruction Fault Status Register */
 	c5_ADFSR,		/* Auxilary Data Fault Status R */
 	c5_AIFSR,		/* Auxilary Instrunction Fault Status R */
 	c6_DFAR,		/* Data Fault Address Register */
 	c6_IFAR,		/* Instruction Fault Address Register */
 	c7_PAR,			/* Physical Address Register */
 	c7_PAR_high,		/* PAR top 32 bits */
 	c9_L2CTLR,		/* Cortex A15/A7 L2 Control Register */
 	c10_PRRR,		/* Primary Region Remap Register */
 	c10_NMRR,		/* Normal Memory Remap Register */
 	c12_VBAR,		/* Vector Base Address Register */
 	c13_CID,		/* Context ID Register */
 	c13_TID_URW,		/* Thread ID, User R/W */
 	c13_TID_URO,		/* Thread ID, User R/O */
 	c13_TID_PRIV,		/* Thread ID, Privileged */
 	c14_CNTKCTL,		/* Timer Control Register (PL1) */
 	c10_AMAIR0,		/* Auxilary Memory Attribute Indirection Reg0 */
 	c10_AMAIR1,		/* Auxilary Memory Attribute Indirection Reg1 */
 	NR_CP15_REGS		/* Number of regs (incl. invalid) */
 };

 struct kvm_cpu_context {
 	struct kvm_regs	gp_regs;
 	struct vfp_hard_struct vfp;
 	u32 cp15[NR_CP15_REGS];
 };

 typedef struct kvm_cpu_context kvm_cpu_context_t;

 struct kvm_vcpu_arch {
 	struct kvm_cpu_context ctxt;

 	int target; /* Processor target */
 	DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);

 	/* The CPU type we expose to the VM */
 	u32 midr;

 	/* HYP trapping configuration */
 	u32 hcr;

 	/* Exception Information */
 	struct kvm_vcpu_fault_info fault;

 	/* Host FP context */
 	kvm_cpu_context_t *host_cpu_context;

 	/* VGIC state */
 	struct vgic_cpu vgic_cpu;
 	struct arch_timer_cpu timer_cpu;

 	/*
 	 * Anything that is not used directly from assembly code goes
 	 * here.
 	 */

 	/* vcpu power-off state */
 	bool power_off;

 	 /* Don't run the guest (internal implementation need) */
 	bool pause;

 	/* IO related fields */
 	struct kvm_decode mmio_decode;

 	/* Cache some mmu pages needed inside spinlock regions */
 	struct kvm_mmu_memory_cache mmu_page_cache;

 	/* Detect first run of a vcpu */
 	bool has_run_once;
 };

 struct kvm_vm_stat {
 	ulong remote_tlb_flush;
 };

 struct kvm_vcpu_stat {
 	u64 halt_successful_poll;
 	u64 halt_attempted_poll;
 	u64 halt_poll_invalid;
 	u64 halt_wakeup;
 	u64 hvc_exit_stat;
 	u64 wfe_exit_stat;
 	u64 wfi_exit_stat;
 	u64 mmio_exit_user;
 	u64 mmio_exit_kernel;
 	u64 exits;
 };

 #define vcpu_cp15(v,r)	(v)->arch.ctxt.cp15[r]

 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 unsigned long kvm_call_hyp(void *hypfn, ...);
 void force_vm_exit(const cpumask_t *mask);
 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
 			      struct kvm_vcpu_events *events);

 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 			      struct kvm_vcpu_events *events);

 #define KVM_ARCH_WANT_MMU_NOTIFIER
 int kvm_unmap_hva_range(struct kvm *kvm,
 			unsigned long start, unsigned long end);
 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);

 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 void kvm_arm_halt_guest(struct kvm *kvm);
 void kvm_arm_resume_guest(struct kvm *kvm);

 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);

 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 		int exception_index);

 static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
 				     int exception_index) {}

 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 				       unsigned long hyp_stack_ptr,
 				       unsigned long vector_ptr)
 {
 	/*
 	 * Call initialization code, and switch to the full blown HYP
 	 * code. The init code doesn't need to preserve these
 	 * registers as r0-r3 are already callee saved according to
 	 * the AAPCS.
 	 * Note that we slightly misuse the prototype by casting the
 	 * stack pointer to a void *.

 	 * The PGDs are always passed as the third argument, in order
 	 * to be passed into r2-r3 to the init code (yes, this is
 	 * compliant with the PCS!).
 	 */

 	kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 }

 static inline void __cpu_init_stage2(void)
 {
 	kvm_call_hyp(__init_stage2_translation);
 }

 static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 {
 	return 0;
 }

 int kvm_perf_init(void);
 int kvm_perf_teardown(void);

 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);

 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);

 static inline bool kvm_arch_requires_vhe(void) { return false; }
 static inline void kvm_arch_hardware_unsetup(void) {}
 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}

 static inline void kvm_arm_init_debug(void) {}
 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}

 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 			       struct kvm_device_attr *attr);
 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 			       struct kvm_device_attr *attr);
 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 			       struct kvm_device_attr *attr);

 /*
  * VFP/NEON switching is all done by the hyp switch code, so no need to
  * coordinate with host context handling for this state:
  */
 static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}

 static inline void kvm_arm_vhe_guest_enter(void) {}
 static inline void kvm_arm_vhe_guest_exit(void) {}

 static inline bool kvm_arm_harden_branch_predictor(void)
 {
 	switch(read_cpuid_part()) {
 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
 	case ARM_CPU_PART_BRAHMA_B15:
 	case ARM_CPU_PART_CORTEX_A12:
 	case ARM_CPU_PART_CORTEX_A15:
 	case ARM_CPU_PART_CORTEX_A17:
 		return true;
 #endif
 	default:
 		return false;
 	}
 }

 #define KVM_SSBD_UNKNOWN		-1
 #define KVM_SSBD_FORCE_DISABLE		0
 #define KVM_SSBD_KERNEL		1
 #define KVM_SSBD_FORCE_ENABLE		2
 #define KVM_SSBD_MITIGATED		3

 static inline int kvm_arm_have_ssbd(void)
 {
 	/* No way to detect it yet, pretend it is not there. */
 	return KVM_SSBD_UNKNOWN;
 }

 static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
 static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}

 #define __KVM_HAVE_ARCH_VM_ALLOC
 struct kvm *kvm_arch_alloc_vm(void);
 void kvm_arch_free_vm(struct kvm *kvm);

 static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 {
 	/*
 	 * On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
 	 * so any non-zero value used as type is illegal.
 	 */
 	if (type)
 		return -EINVAL;
 	return 0;
 }

 #endif /* __ARM_KVM_HOST_H__ */
	/*
	* Copyright (C) 2012 - Virtual Open Systems and Columbia University
	* Author: Christoffer Dall <c.dall@virtualopensystems.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2, as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*/

	#ifndef __ARM_KVM_HOST_H__
	#define __ARM_KVM_HOST_H__

	#include <linux/types.h>
	#include <linux/kvm_types.h>
	#include <asm/cputype.h>
	#include <asm/kvm.h>
	#include <asm/kvm_asm.h>
	#include <asm/kvm_mmio.h>
	#include <asm/fpstate.h>
	#include <kvm/arm_arch_timer.h>

	#define __KVM_HAVE_ARCH_INTC_INITIALIZED

	#define KVM_USER_MEM_SLOTS 32
	#define KVM_HAVE_ONE_REG
	#define KVM_HALT_POLL_NS_DEFAULT 500000

	#define KVM_VCPU_MAX_FEATURES 2

	#include <kvm/arm_vgic.h>


	#ifdef CONFIG_ARM_GIC_V3
	#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
	#else
	#define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
	#endif

	#define KVM_REQ_SLEEP \
	KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT \| KVM_REQUEST_NO_WAKEUP)
	#define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1)

	DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);

	u32 kvm_vcpu_reg(struct kvm_vcpu vcpu, u8 reg_num, u32 mode);
	int __attribute_const__ kvm_target_cpu(void);
	int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
	void kvm_reset_coprocs(struct kvm_vcpu *vcpu);

	struct kvm_arch {
	/* VTTBR value associated with below pgd and vmid */
	u64 vttbr;

	/* The last vcpu id that ran on each physical CPU */
	int __percpu *last_vcpu_ran;

	/*
	* Anything that is not used directly from assembly code goes
	* here.
	*/

	/* The VMID generation used for the virt. memory system */
	u64 vmid_gen;
	u32 vmid;

	/* Stage-2 page table */
	pgd_t *pgd;

	/* Interrupt controller */
	struct vgic_dist vgic;
	int max_vcpus;

	/* Mandated version of PSCI */
	u32 psci_version;
	};

	#define KVM_NR_MEM_OBJS 40

	/*
	* We don't want allocation failures within the mmu code, so we preallocate
	* enough memory for a single page fault in a cache.
	*/
	struct kvm_mmu_memory_cache {
	int nobjs;
	void *objects[KVM_NR_MEM_OBJS];
	};

	struct kvm_vcpu_fault_info {
	u32 hsr; /* Hyp Syndrome Register */
	u32 hxfar; /* Hyp Data/Inst. Fault Address Register */
	u32 hpfar; /* Hyp IPA Fault Address Register */
	};

	/*
	* 0 is reserved as an invalid value.
	* Order should be kept in sync with the save/restore code.
	*/
	enum vcpu_sysreg {
	__INVALID_SYSREG__,
	c0_MPIDR, /* MultiProcessor ID Register */
	c0_CSSELR, /* Cache Size Selection Register */
	c1_SCTLR, /* System Control Register */
	c1_ACTLR, /* Auxiliary Control Register */
	c1_CPACR, /* Coprocessor Access Control */
	c2_TTBR0, /* Translation Table Base Register 0 */
	c2_TTBR0_high, /* TTBR0 top 32 bits */
	c2_TTBR1, /* Translation Table Base Register 1 */
	c2_TTBR1_high, /* TTBR1 top 32 bits */
	c2_TTBCR, /* Translation Table Base Control R. */
	c3_DACR, /* Domain Access Control Register */
	c5_DFSR, /* Data Fault Status Register */
	c5_IFSR, /* Instruction Fault Status Register */
	c5_ADFSR, /* Auxilary Data Fault Status R */
	c5_AIFSR, /* Auxilary Instrunction Fault Status R */
	c6_DFAR, /* Data Fault Address Register */
	c6_IFAR, /* Instruction Fault Address Register */
	c7_PAR, /* Physical Address Register */
	c7_PAR_high, /* PAR top 32 bits */
	c9_L2CTLR, /* Cortex A15/A7 L2 Control Register */
	c10_PRRR, /* Primary Region Remap Register */
	c10_NMRR, /* Normal Memory Remap Register */
	c12_VBAR, /* Vector Base Address Register */
	c13_CID, /* Context ID Register */
	c13_TID_URW, /* Thread ID, User R/W */
	c13_TID_URO, /* Thread ID, User R/O */
	c13_TID_PRIV, /* Thread ID, Privileged */
	c14_CNTKCTL, /* Timer Control Register (PL1) */
	c10_AMAIR0, /* Auxilary Memory Attribute Indirection Reg0 */
	c10_AMAIR1, /* Auxilary Memory Attribute Indirection Reg1 */
	NR_CP15_REGS /* Number of regs (incl. invalid) */
	};

	struct kvm_cpu_context {
	struct kvm_regs gp_regs;
	struct vfp_hard_struct vfp;
	u32 cp15[NR_CP15_REGS];
	};

	typedef struct kvm_cpu_context kvm_cpu_context_t;

	struct kvm_vcpu_arch {
	struct kvm_cpu_context ctxt;

	int target; /* Processor target */
	DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);

	/* The CPU type we expose to the VM */
	u32 midr;

	/* HYP trapping configuration */
	u32 hcr;

	/* Exception Information */
	struct kvm_vcpu_fault_info fault;

	/* Host FP context */
	kvm_cpu_context_t *host_cpu_context;

	/* VGIC state */
	struct vgic_cpu vgic_cpu;
	struct arch_timer_cpu timer_cpu;

	/*
	* Anything that is not used directly from assembly code goes
	* here.
	*/

	/* vcpu power-off state */
	bool power_off;

	/* Don't run the guest (internal implementation need) */
	bool pause;

	/* IO related fields */
	struct kvm_decode mmio_decode;

	/* Cache some mmu pages needed inside spinlock regions */
	struct kvm_mmu_memory_cache mmu_page_cache;

	/* Detect first run of a vcpu */
	bool has_run_once;
	};

	struct kvm_vm_stat {
	ulong remote_tlb_flush;
	};

	struct kvm_vcpu_stat {
	u64 halt_successful_poll;
	u64 halt_attempted_poll;
	u64 halt_poll_invalid;
	u64 halt_wakeup;
	u64 hvc_exit_stat;
	u64 wfe_exit_stat;
	u64 wfi_exit_stat;
	u64 mmio_exit_user;
	u64 mmio_exit_kernel;
	u64 exits;
	};

	#define vcpu_cp15(v,r) (v)->arch.ctxt.cp15[r]

	int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user indices);
	int kvm_arm_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg);
	int kvm_arm_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg);
	unsigned long kvm_call_hyp(void *hypfn, ...);
	void force_vm_exit(const cpumask_t *mask);
	int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
	struct kvm_vcpu_events *events);

	int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
	struct kvm_vcpu_events *events);

	#define KVM_ARCH_WANT_MMU_NOTIFIER
	int kvm_unmap_hva_range(struct kvm *kvm,
	unsigned long start, unsigned long end);
	int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user indices);
	int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
	int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);

	struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
	struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
	void kvm_arm_halt_guest(struct kvm *kvm);
	void kvm_arm_resume_guest(struct kvm *kvm);

	int kvm_arm_copy_coproc_indices(struct kvm_vcpu vcpu, u64 __user uindices);
	unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
	int kvm_arm_coproc_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg );
	int kvm_arm_coproc_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg );

	int handle_exit(struct kvm_vcpu vcpu, struct kvm_run run,
	int exception_index);

	static inline void handle_exit_early(struct kvm_vcpu vcpu, struct kvm_run run,
	int exception_index) {}

	static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
	unsigned long hyp_stack_ptr,
	unsigned long vector_ptr)
	{
	/*
	* Call initialization code, and switch to the full blown HYP
	* code. The init code doesn't need to preserve these
	* registers as r0-r3 are already callee saved according to
	* the AAPCS.
	* Note that we slightly misuse the prototype by casting the
	* stack pointer to a void *.

	* The PGDs are always passed as the third argument, in order
	* to be passed into r2-r3 to the init code (yes, this is
	* compliant with the PCS!).
	*/

	kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
	}

	static inline void __cpu_init_stage2(void)
	{
	kvm_call_hyp(__init_stage2_translation);
	}

	static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
	{
	return 0;
	}

	int kvm_perf_init(void);
	int kvm_perf_teardown(void);

	void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);

	struct kvm_vcpu kvm_mpidr_to_vcpu(struct kvm kvm, unsigned long mpidr);

	static inline bool kvm_arch_requires_vhe(void) { return false; }
	static inline void kvm_arch_hardware_unsetup(void) {}
	static inline void kvm_arch_sync_events(struct kvm *kvm) {}
	static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
	static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
	static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}

	static inline void kvm_arm_init_debug(void) {}
	static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
	static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
	static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}

	int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
	struct kvm_device_attr *attr);
	int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
	struct kvm_device_attr *attr);
	int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
	struct kvm_device_attr *attr);

	/*
	* VFP/NEON switching is all done by the hyp switch code, so no need to
	* coordinate with host context handling for this state:
	*/
	static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
	static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
	static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}

	static inline void kvm_arm_vhe_guest_enter(void) {}
	static inline void kvm_arm_vhe_guest_exit(void) {}

	static inline bool kvm_arm_harden_branch_predictor(void)
	{
	switch(read_cpuid_part()) {
	#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
	case ARM_CPU_PART_BRAHMA_B15:
	case ARM_CPU_PART_CORTEX_A12:
	case ARM_CPU_PART_CORTEX_A15:
	case ARM_CPU_PART_CORTEX_A17:
	return true;
	#endif
	default:
	return false;
	}
	}

	#define KVM_SSBD_UNKNOWN -1
	#define KVM_SSBD_FORCE_DISABLE 0
	#define KVM_SSBD_KERNEL 1
	#define KVM_SSBD_FORCE_ENABLE 2
	#define KVM_SSBD_MITIGATED 3

	static inline int kvm_arm_have_ssbd(void)
	{
	/* No way to detect it yet, pretend it is not there. */
	return KVM_SSBD_UNKNOWN;
	}

	static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
	static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}

	#define __KVM_HAVE_ARCH_VM_ALLOC
	struct kvm *kvm_arch_alloc_vm(void);
	void kvm_arch_free_vm(struct kvm *kvm);

	static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
	{
	/*
	* On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
	* so any non-zero value used as type is illegal.
	*/
	if (type)
	return -EINVAL;
	return 0;
	}

	#endif /* __ARM_KVM_HOST_H__ */