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

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *
 * 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>
#include <asm/mce.h>

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

#include <asm/cputhreads.h>

#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
#include <asm/kvm_book3s_asm.h>		/* for MAX_SMT_THREADS */
#define KVM_MAX_VCPU_ID		(MAX_SMT_THREADS * KVM_MAX_VCORES)
#define KVM_MAX_NESTED_GUESTS	KVMPPC_NR_LPIDS

#else
#define KVM_MAX_VCPU_ID		KVM_MAX_VCPUS
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */

#define __KVM_HAVE_ARCH_INTC_INITIALIZED

#define KVM_HALT_POLL_NS_DEFAULT 10000	/* 10 us */

/* 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	KVM_ARCH_REQ(0)
#define KVM_REQ_EPR_EXIT	KVM_ARCH_REQ(1)

#include <linux/mmu_notifier.h>

#define KVM_ARCH_WANT_MMU_NOTIFIER

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 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

#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_nested_guest;

struct kvm_vm_stat {
	ulong remote_tlb_flush;
	ulong num_2M_pages;
	ulong num_1G_pages;
};

struct kvm_vcpu_stat {
	u64 sum_exits;
	u64 mmio_exits;
	u64 signal_exits;
	u64 light_exits;
	/* Account for special types of light exits: */
	u64 itlb_real_miss_exits;
	u64 itlb_virt_miss_exits;
	u64 dtlb_real_miss_exits;
	u64 dtlb_virt_miss_exits;
	u64 syscall_exits;
	u64 isi_exits;
	u64 dsi_exits;
	u64 emulated_inst_exits;
	u64 dec_exits;
	u64 ext_intr_exits;
	u64 halt_poll_success_ns;
	u64 halt_poll_fail_ns;
	u64 halt_wait_ns;
	u64 halt_successful_poll;
	u64 halt_attempted_poll;
	u64 halt_successful_wait;
	u64 halt_poll_invalid;
	u64 halt_wakeup;
	u64 dbell_exits;
	u64 gdbell_exits;
	u64 ld;
	u64 st;
#ifdef CONFIG_PPC_BOOK3S
	u64 pf_storage;
	u64 pf_instruc;
	u64 sp_storage;
	u64 sp_instruc;
	u64 queue_intr;
	u64 ld_slow;
	u64 st_slow;
#endif
	u64 pthru_all;
	u64 pthru_host;
	u64 pthru_bad_aff;
};

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_iommu_table {
	struct rcu_head rcu;
	struct list_head next;
	struct iommu_table *tbl;
	struct kref kref;
};

#define TCES_PER_PAGE	(PAGE_SIZE / sizeof(u64))

struct kvmppc_spapr_tce_table {
	struct list_head list;
	struct kvm *kvm;
	u64 liobn;
	struct rcu_head rcu;
	u32 page_shift;
	u64 offset;		/* in pages */
	u64 size;		/* window size in pages */
	struct list_head iommu_tables;
	struct mutex alloc_lock;
	struct page *pages[0];
};

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

/* XIVE components, defined in book3s_xive.c */
struct kvmppc_xive;
struct kvmppc_xive_vcpu;
extern struct kvm_device_ops kvm_xive_ops;
extern struct kvm_device_ops kvm_xive_native_ops;

struct kvmppc_passthru_irqmap;

/*
 * 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;
};

/*
 * The rmap array of size number of guest pages is allocated for each memslot.
 * This array is used to store usage specific information about the guest page.
 * Below are the encodings of the various possible usage types.
 */
/* Free bits which can be used to define a new usage */
#define KVMPPC_RMAP_TYPE_MASK	0xff00000000000000
#define KVMPPC_RMAP_NESTED	0xc000000000000000	/* Nested rmap array */
#define KVMPPC_RMAP_HPT		0x0100000000000000	/* HPT guest */

/*
 * rmap usage definition for a hash page table (hpt) guest:
 * 0x0000080000000000	Lock bit
 * 0x0000018000000000	RC bits
 * 0x0000000100000000	Present bit
 * 0x00000000ffffffff	HPT index bits
 * The bottom 32 bits are the index in the guest HPT of a HPTE that points to
 * the page.
 */
#define KVMPPC_RMAP_LOCK_BIT	43
#define KVMPPC_RMAP_RC_SHIFT	32
#define KVMPPC_RMAP_REFERENCED	(HPTE_R_R << KVMPPC_RMAP_RC_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_hpt_info {
	/* Host virtual (linear mapping) address of guest HPT */
	unsigned long virt;
	/* Array of reverse mapping entries for each guest HPTE */
	struct revmap_entry *rev;
	/* Guest HPT size is 2**(order) bytes */
	u32 order;