path: root/arch/powerpc/include/asm/kvm_host.h

/*
 * 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.
 *
 * Copyright IBM Corp. 2007
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 */

#ifndef __POWERPC_KVM_HOST_H__
#define __POWERPC_KVM_HOST_H__

#include <linux/mutex.h>
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/kvm_types.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/kvm_para.h>
#include <linux/list.h>
#include <linux/atomic.h>
#include <asm/kvm_asm.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <asm/hvcall.h>

#define KVM_MAX_VCPUS		NR_CPUS
#define KVM_MAX_VCORES		NR_CPUS
#define KVM_USER_MEM_SLOTS	512

#ifdef CONFIG_KVM_MMIO
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#endif
#define KVM_HALT_POLL_NS_DEFAULT 500000

/* These values are internal and can be increased later */
#define KVM_NR_IRQCHIPS          1
#define KVM_IRQCHIP_NUM_PINS     256

/* PPC-specific vcpu->requests bit members */
#define KVM_REQ_WATCHDOG           8
#define KVM_REQ_EPR_EXIT           9

#include <linux/mmu_notifier.h>

#define KVM_ARCH_WANT_MMU_NOTIFIER

extern int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
extern int kvm_unmap_hva_range(struct kvm *kvm,
			       unsigned long start, unsigned long end);
extern int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
extern void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
							 unsigned long address)
{
}

#define HPTEG_CACHE_NUM			(1 << 15)
#define HPTEG_HASH_BITS_PTE		13
#define HPTEG_HASH_BITS_PTE_LONG	12
#define HPTEG_HASH_BITS_VPTE		13
#define HPTEG_HASH_BITS_VPTE_LONG	5
#define HPTEG_HASH_BITS_VPTE_64K	11
#define HPTEG_HASH_NUM_PTE		(1 << HPTEG_HASH_BITS_PTE)
#define HPTEG_HASH_NUM_PTE_LONG		(1 << HPTEG_HASH_BITS_PTE_LONG)
#define HPTEG_HASH_NUM_VPTE		(1 << HPTEG_HASH_BITS_VPTE)
#define HPTEG_HASH_NUM_VPTE_LONG	(1 << HPTEG_HASH_BITS_VPTE_LONG)
#define HPTEG_HASH_NUM_VPTE_64K		(1 << HPTEG_HASH_BITS_VPTE_64K)

/* Physical Address Mask - allowed range of real mode RAM access */
#define KVM_PAM			0x0fffffffffffffffULL

struct lppaca;
struct slb_shadow;
struct dtl_entry;

struct kvmppc_vcpu_book3s;
struct kvmppc_book3s_shadow_vcpu;

struct kvm_vm_stat {
	u32 remote_tlb_flush;
};

struct kvm_vcpu_stat {
	u32 sum_exits;
	u32 mmio_exits;
	u32 signal_exits;
	u32 light_exits;
	/* Account for special types of light exits: */
	u32 itlb_real_miss_exits;
	u32 itlb_virt_miss_exits;
	u32 dtlb_real_miss_exits;
	u32 dtlb_virt_miss_exits;
	u32 syscall_exits;
	u32 isi_exits;
	u32 dsi_exits;
	u32 emulated_inst_exits;
	u32 dec_exits;
	u32 ext_intr_exits;
	u32 halt_successful_poll;
	u32 halt_attempted_poll;
	u32 halt_wakeup;
	u32 dbell_exits;
	u32 gdbell_exits;
	u32 ld;
	u32 st;
#ifdef CONFIG_PPC_BOOK3S
	u32 pf_storage;
	u32 pf_instruc;
	u32 sp_storage;
	u32 sp_instruc;
	u32 queue_intr;
	u32 ld_slow;
	u32 st_slow;
#endif
};

enum kvm_exit_types {
	MMIO_EXITS,
	SIGNAL_EXITS,
	ITLB_REAL_MISS_EXITS,
	ITLB_VIRT_MISS_EXITS,
	DTLB_REAL_MISS_EXITS,
	DTLB_VIRT_MISS_EXITS,
	SYSCALL_EXITS,
	ISI_EXITS,
	DSI_EXITS,
	EMULATED_INST_EXITS,
	EMULATED_MTMSRWE_EXITS,
	EMULATED_WRTEE_EXITS,
	EMULATED_MTSPR_EXITS,
	EMULATED_MFSPR_EXITS,
	EMULATED_MTMSR_EXITS,
	EMULATED_MFMSR_EXITS,
	EMULATED_TLBSX_EXITS,
	EMULATED_TLBWE_EXITS,
	EMULATED_RFI_EXITS,
	EMULATED_RFCI_EXITS,
	EMULATED_RFDI_EXITS,
	DEC_EXITS,
	EXT_INTR_EXITS,
	HALT_WAKEUP,
	USR_PR_INST,
	FP_UNAVAIL,
	DEBUG_EXITS,
	TIMEINGUEST,
	DBELL_EXITS,
	GDBELL_EXITS,
	__NUMBER_OF_KVM_EXIT_TYPES
};

/* allow access to big endian 32bit upper/lower parts and 64bit var */
struct kvmppc_exit_timing {
	union {
		u64 tv64;
		struct {
			u32 tbu, tbl;
		} tv32;
	};
};

struct kvmppc_pginfo {
	unsigned long pfn;
	atomic_t refcnt;
};

struct kvmppc_spapr_tce_table {
	struct list_head list;
	struct kvm *kvm;
	u64 liobn;
	u32 window_size;
	struct page *pages[0];
};

/* XICS components, defined in book3s_xics.c */
struct kvmppc_xics;
struct kvmppc_icp;

/*
 * The reverse mapping array has one entry for each HPTE,
 * which stores the guest's view of the second word of the HPTE
 * (including the guest physical address of the mapping),
 * plus forward and backward pointers in a doubly-linked ring
 * of HPTEs that map the same host page.  The pointers in this
 * ring are 32-bit HPTE indexes, to save space.
 */
struct revmap_entry {
	unsigned long guest_rpte;
	unsigned int forw, back;
};

/*
 * We use the top bit of each memslot->arch.rmap entry as a lock bit,
 * and bit 32 as a present flag.  The bottom 32 bits are the
 * index in the guest HPT of a HPTE that points to the page.
 */
#define KVMPPC_RMAP_LOCK_BIT	63
#define KVMPPC_RMAP_RC_SHIFT	32
#define KVMPPC_RMAP_CHG_SHIFT	48
#define KVMPPC_RMAP_REFERENCED	(HPTE_R_R << KVMPPC_RMAP_RC_SHIFT)
#define KVMPPC_RMAP_CHANGED	(HPTE_R_C << KVMPPC_RMAP_RC_SHIFT)
#define KVMPPC_RMAP_CHG_ORDER	(0x3ful << KVMPPC_RMAP_CHG_SHIFT)
#define KVMPPC_RMAP_PRESENT	0x100000000ul
#define KVMPPC_RMAP_INDEX	0xfffffffful

struct kvm_arch_memory_slot {
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	unsigned long *rmap;
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
};

struct kvm_arch {
	unsigned int lpid;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	unsigned long hpt_virt;
	struct revmap_entry *revmap;
	unsigned int host_lpid;
	unsigned long host_lpcr;
	unsigned long sdr1;
	unsigned long host_sdr1;
	int tlbie_lock;
	unsigned long lpcr;
	unsigned long vrma_slb_v;
	int hpte_setup_done;
	u32 hpt_order;
	atomic_t vcpus_running;
	u32 online_vcores;
	unsigned long hpt_npte;
	unsigned long hpt_mask;
	atomic_t hpte_mod_interest;
	cpumask_t need_tlb_flush;
	int hpt_cma_alloc;
	struct dentry *debugfs_dir;
	struct dentry *htab_dentry;
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
	struct mutex hpt_mutex;
#endif
#ifdef CONFIG_PPC_BOOK3S_64
	struct list_head spapr_tce_tables;
	struct list_head rtas_tokens;
	DECLARE_BITMAP(enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
#endif
#ifdef CONFIG_KVM_MPIC
	struct openpic *mpic;
#endif
#ifdef CONFIG_KVM_XICS
	struct kvmppc_xics *xics;
#endif
	struct kvmppc_ops *kvm_ops;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	/* This array can grow quite large, keep it at the end */
	struct kvmppc_vcore *vcores[KVM_MAX_VCORES];
#endif
};

/*
 * Struct for a virtual core.
 * Note: entry_exit_map combines a bitmap of threads that have entered
 * in the bottom 8 bits and a bitmap of threads that have exited in the
 * next 8 bits.  This is so that we can atomically set the entry bit
 * iff the exit map is 0 without taking a lock.
 */
struct kvmppc_vcore {
	int n_runnable;
	int num_threads;
	int entry_exit_map;
	int napping_threads;
	int first_vcpuid;
	u16 pcpu;
	u16 last_cpu;
	u8 vcore_state;
	u8 in_guest;
	struct kvmppc_vcore *master_vcore;
	struct list_head runnable_threads;
	struct list_head preempt_list;
	spinlock_t lock;
	struct swait_queue_head wq;
	spinlock_t stoltb_lock;	/* protects stolen_tb and preempt_tb */
	u64 stolen_tb;
	u64 preempt_tb;
	struct kvm_vcpu *runner;
	struct kvm *kvm;
	u64 tb_offset;		/* guest timebase - host timebase */