/*
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
* Author: Christoffer Dall <[email protected]>
*
* 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 <asm/kvm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmio.h>
#include <asm/fpstate.h>
#include <kvm/arm_arch_timer.h>

#if defined(CONFIG_KVM_ARM_MAX_VCPUS)
#define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
#else
#define KVM_MAX_VCPUS 0
#endif

#define KVM_USER_MEM_SLOTS 32
#define KVM_PRIVATE_MEM_SLOTS 4
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#define KVM_HAVE_ONE_REG

#define KVM_VCPU_MAX_FEATURES 1

#include <kvm/arm_vgic.h>

struct kvm_vcpu;
u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
int 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;

/* Timer */
struct arch_timer_kvm timer;

/*
* 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;
};

#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 */
u32 hyp_pc; /* PC when exception was taken from Hyp mode */
};

typedef struct vfp_hard_struct kvm_cpu_context_t;

struct kvm_vcpu_arch {
struct kvm_regs regs;

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

/* System control coprocessor (cp15) */
u32 cp15[NR_CP15_REGS];

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

/* Exception Information */
struct kvm_vcpu_fault_info fault;

/* Floating point registers (VFP and Advanced SIMD/NEON) */
struct vfp_hard_struct vfp_guest;

/* 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.
*/
/* dcache set/way operation pending */
int last_pcpu;
cpumask_t require_dcache_flush;

/* Don't run the guest on this vcpu */
bool pause;

/* IO related fields */
struct kvm_decode mmio_decode;

/* Interrupt related fields */
u32 irq_lines; /* IRQ and FIQ levels */

/* 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 {
u32 remote_tlb_flush;
};

struct kvm_vcpu_stat {
u32 halt_wakeup;
};

struct kvm_vcpu_init;
int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
const struct kvm_vcpu_init *init);
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);
struct kvm_one_reg;
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);
u64 kvm_call_hyp(void *hypfn, ...);
void force_vm_exit(const cpumask_t *mask);

#define KVM_ARCH_WANT_MMU_NOTIFIER
struct kvm;
int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
int kvm_unmap_hva_range(struct kvm *kvm,
unsigned long start, unsigned long end);
void 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);

/* We do not have shadow page tables, hence the empty hooks */
static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
{
return 0;
}

static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
{
return 0;
}

struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);

int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
struct kvm_one_reg;
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 __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
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 casing the
* stack pointer to a void *.
*
* We don't have enough registers to perform the full init in
* one go. Install the boot PGD first, and then install the
* runtime PGD, stack pointer and vectors. 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(NULL, 0, boot_pgd_ptr);

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

static inline int kvm_arch_dev_ioctl_check_extension(long ext)
{
return 0;
}

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

#endif /* __ARM_KVM_HOST_H__ */