kvm_host.h

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/*
 * 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 <[email protected]>
 */

#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>

#define KVM_MAX_VCPUS       NR_CPUS
#define KVM_MAX_VCORES      NR_CPUS
#define KVM_MEMORY_SLOTS 32
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 4
#define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)

#ifdef CONFIG_KVM_MMIO
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#endif

#ifdef CONFIG_KVM_BOOK3S_64_HV
#include <linux/mmu_notifier.h>

#define KVM_ARCH_WANT_MMU_NOTIFIER

struct kvm;
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 hva);
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);

#endif

/* We don't currently support large pages. */
#define KVM_HPAGE_GFN_SHIFT(x)  0
#define KVM_NR_PAGE_SIZES   1
#define KVM_PAGES_PER_HPAGE(x)  (1UL<<31)

#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_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)

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

struct kvm;
struct kvm_run;
struct kvm_vcpu;

struct lppaca;
struct slb_shadow;
struct dtl_entry;

struct kvm_vm_stat {
    u32 remote_tlb_flush;
};

struct kvm_vcpu_stat {
    u32 sum_exits;
    u32 mmio_exits;
    u32 dcr_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_wakeup;
    u32 dbell_exits;
    u32 gdbell_exits;
#ifdef CONFIG_PPC_BOOK3S
    u32 pf_storage;
    u32 pf_instruc;
    u32 sp_storage;
    u32 sp_instruc;
    u32 queue_intr;
    u32 ld;
    u32 ld_slow;
    u32 st;
    u32 st_slow;
#endif
};

enum kvm_exit_types {
    MMIO_EXITS,
    DCR_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,
    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];
};

struct kvmppc_linear_info {
    void        *base_virt;
    unsigned long    base_pfn;
    unsigned long    npages;
    struct list_head list;
    atomic_t     use_count;
    int      type;
};

/*
 * 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->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_REFERENCED  (HPTE_R_R << KVMPPC_RMAP_RC_SHIFT)
#define KVMPPC_RMAP_CHANGED (HPTE_R_C << KVMPPC_RMAP_RC_SHIFT)
#define KVMPPC_RMAP_PRESENT 0x100000000ul
#define KVMPPC_RMAP_INDEX   0xfffffffful

/* Low-order bits in kvm->arch.slot_phys[][] */
#define KVMPPC_PAGE_ORDER_MASK  0x1f
#define KVMPPC_PAGE_NO_CACHE    HPTE_R_I    /* 0x20 */
#define KVMPPC_PAGE_WRITETHRU   HPTE_R_W    /* 0x40 */
#define KVMPPC_GOT_PAGE     0x80

struct kvm_arch_memory_slot {
    unsigned long *rmap;
};

struct kvm_arch {
    unsigned int lpid;
#ifdef CONFIG_KVM_BOOK3S_64_HV
    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 rmor;
    struct kvmppc_linear_info *rma;
    unsigned long vrma_slb_v;
    int rma_setup_done;
    int using_mmu_notifiers;
    u32 hpt_order;
    atomic_t vcpus_running;
    unsigned long hpt_npte;
    unsigned long hpt_mask;
    spinlock_t slot_phys_lock;
    unsigned long *slot_phys[KVM_MEM_SLOTS_NUM];
    int slot_npages[KVM_MEM_SLOTS_NUM];
    unsigned short last_vcpu[NR_CPUS];
    struct kvmppc_vcore *vcores[KVM_MAX_VCORES];
    struct kvmppc_linear_info *hpt_li;
#endif /* CONFIG_KVM_BOOK3S_64_HV */
#ifdef CONFIG_PPC_BOOK3S_64
    struct list_head spapr_tce_tables;
#endif
};

/*
 * Struct for a virtual core.
 * Note: entry_exit_count combines an entry count in the bottom 8 bits
 * and an exit count in the next 8 bits.  This is so that we can
 * atomically increment the entry count iff the exit count is 0
 * without taking the lock.
 */
struct kvmppc_vcore {
    int n_runnable;
    int n_busy;
    int num_threads;
    int entry_exit_count;
    int n_woken;
    int nap_count;
    int napping_threads;
    u16 pcpu;
    u8 vcore_state;
    u8 in_guest;
    struct list_head runnable_threads;
    spinlock_t lock;
    wait_queue_head_t wq;
    u64 stolen_tb;
    u64 preempt_tb;
    struct kvm_vcpu *runner;
};

#define VCORE_ENTRY_COUNT(vc)   ((vc)->entry_exit_count & 0xff)
#define VCORE_EXIT_COUNT(vc)    ((vc)->entry_exit_count >> 8)

/* Values for vcore_state */
#define VCORE_INACTIVE  0
#define VCORE_RUNNING   1
#define VCORE_EXITING   2
#define VCORE_SLEEPING  3

/*
 * Struct used to manage memory for a virtual processor area
 * registered by a PAPR guest.  There are three types of area
 * that a guest can register.
 */
struct kvmppc_vpa {
    void *pinned_addr;  /* Address in kernel linear mapping */
    void *pinned_end;   /* End of region */
    unsigned long next_gpa; /* Guest phys addr for update */
    unsigned long len;  /* Number of bytes required */
    u8 update_pending;  /* 1 => update pinned_addr from next_gpa */
};

struct kvmppc_pte {
    ulong eaddr;
    u64 vpage;
    ulong raddr;
    bool may_read       : 1;
    bool may_write      : 1;
    bool may_execute    : 1;
};

struct kvmppc_mmu {
    /* book3s_64 only */
    void (*slbmte)(struct kvm_vcpu *vcpu, u64 rb, u64 rs);
    u64  (*slbmfee)(struct kvm_vcpu *vcpu, u64 slb_nr);
    u64  (*slbmfev)(struct kvm_vcpu *vcpu, u64 slb_nr);
    void (*slbie)(struct kvm_vcpu *vcpu, u64 slb_nr);
    void (*slbia)(struct kvm_vcpu *vcpu);
    /* book3s */
    void (*mtsrin)(struct kvm_vcpu *vcpu, u32 srnum, ulong value);
    u32  (*mfsrin)(struct kvm_vcpu *vcpu, u32 srnum);
    int  (*xlate)(struct kvm_vcpu *vcpu, gva_t eaddr, struct kvmppc_pte *pte, bool data);
    void (*reset_msr)(struct kvm_vcpu *vcpu);
    void (*tlbie)(struct kvm_vcpu *vcpu, ulong addr, bool large);
    int  (*esid_to_vsid)(struct kvm_vcpu *vcpu, ulong esid, u64 *vsid);
    u64  (*ea_to_vp)(struct kvm_vcpu *vcpu, gva_t eaddr, bool data);
    bool (*is_dcbz32)(struct kvm_vcpu *vcpu);
};

struct kvmppc_slb {
    u64 esid;
    u64 vsid;
    u64 orige;
    u64 origv;
    bool valid  : 1;
    bool Ks     : 1;
    bool Kp     : 1;
    bool nx     : 1;
    bool large  : 1;    /* PTEs are 16MB */
    bool tb     : 1;    /* 1TB segment */
    bool class  : 1;
};

struct kvm_vcpu_arch {
    ulong host_stack;
    u32 host_pid;
#ifdef CONFIG_PPC_BOOK3S
    struct kvmppc_slb slb[64];
    int slb_max;        /* 1 + index of last valid entry in slb[] */
    int slb_nr;     /* total number of entries in SLB */
    struct kvmppc_mmu mmu;
#endif

    ulong gpr[32];

    u64 fpr[32];
    u64 fpscr;

#ifdef CONFIG_SPE
    ulong evr[32];
    ulong spefscr;
    ulong host_spefscr;
    u64 acc;
#endif
#ifdef CONFIG_ALTIVEC
    vector128 vr[32];
    vector128 vscr;
#endif

#ifdef CONFIG_VSX
    u64 vsr[64];
#endif

#ifdef CONFIG_KVM_BOOKE_HV
    u32 host_mas4;
    u32 host_mas6;
    u32 shadow_epcr;
    u32 epcr;
    u32 shadow_msrp;
    u32 eplc;
    u32 epsc;
    u32 oldpir;
#endif

#ifdef CONFIG_PPC_BOOK3S
    /* For Gekko paired singles */
    u32 qpr[32];
#endif

    ulong pc;
    ulong ctr;
    ulong lr;

    ulong xer;
    u32 cr;

#ifdef CONFIG_PPC_BOOK3S
    ulong hflags;
    ulong guest_owned_ext;
    ulong purr;
    ulong spurr;
    ulong dscr;
    ulong amr;
    ulong uamor;
    u32 ctrl;
    ulong dabr;
#endif
    u32 vrsave; /* also USPRG0 */
    u32 mmucr;
    /* shadow_msr is unused for BookE HV */
    ulong shadow_msr;
    ulong csrr0;
    ulong csrr1;
    ulong dsrr0;
    ulong dsrr1;
    ulong mcsrr0;
    ulong mcsrr1;
    ulong mcsr;
    u32 dec;
#ifdef CONFIG_BOOKE
    u32 decar;
#endif
    u32 tbl;
    u32 tbu;
    u32 tcr;
    ulong tsr; /* we need to perform set/clr_bits() which requires ulong */
    u32 ivor[64];
    ulong ivpr;
    u32 pvr;

    u32 shadow_pid;
    u32 shadow_pid1;
    u32 pid;
    u32 swap_pid;

    u32 ccr0;
    u32 ccr1;
    u32 dbcr0;
    u32 dbcr1;
    u32 dbsr;

    u64 mmcr[3];
    u32 pmc[8];

#ifdef CONFIG_KVM_EXIT_TIMING
    struct mutex exit_timing_lock;
    struct kvmppc_exit_timing timing_exit;
    struct kvmppc_exit_timing timing_last_enter;
    u32 last_exit_type;
    u32 timing_count_type[__NUMBER_OF_KVM_EXIT_TYPES];
    u64 timing_sum_duration[__NUMBER_OF_KVM_EXIT_TYPES];
    u64 timing_sum_quad_duration[__NUMBER_OF_KVM_EXIT_TYPES];
    u64 timing_min_duration[__NUMBER_OF_KVM_EXIT_TYPES];
    u64 timing_max_duration[__NUMBER_OF_KVM_EXIT_TYPES];
    u64 timing_last_exit;
    struct dentry *debugfs_exit_timing;
#endif

#ifdef CONFIG_PPC_BOOK3S
    ulong fault_dar;
    u32 fault_dsisr;
#endif

#ifdef CONFIG_BOOKE
    ulong fault_dear;
    ulong fault_esr;
    ulong queued_dear;
    ulong queued_esr;
    u32 tlbcfg[4];
    u32 mmucfg;
    u32 epr;
#endif
    gpa_t paddr_accessed;
    gva_t vaddr_accessed;

    u8 io_gpr; /* GPR used as IO source/target */
    u8 mmio_is_bigendian;
    u8 mmio_sign_extend;
    u8 dcr_needed;
    u8 dcr_is_write;
    u8 osi_needed;
    u8 osi_enabled;
    u8 papr_enabled;
    u8 sane;
    u8 cpu_type;
    u8 hcall_needed;

    u32 cpr0_cfgaddr; /* holds the last set cpr0_cfgaddr */

    struct hrtimer dec_timer;
    struct tasklet_struct tasklet;
    u64 dec_jiffies;
    u64 dec_expires;
    unsigned long pending_exceptions;
    u16 last_cpu;
    u8 ceded;
    u8 prodded;
    u32 last_inst;

    wait_queue_head_t *wqp;
    struct kvmppc_vcore *vcore;
    int ret;
    int trap;
    int state;
    int ptid;
    bool timer_running;
    wait_queue_head_t cpu_run;

    struct kvm_vcpu_arch_shared *shared;
    unsigned long magic_page_pa; /* phys addr to map the magic page to */
    unsigned long magic_page_ea; /* effect. addr to map the magic page to */

#ifdef CONFIG_KVM_BOOK3S_64_HV
    struct kvm_vcpu_arch_shared shregs;

    unsigned long pgfault_addr;
    long pgfault_index;
    unsigned long pgfault_hpte[2];

    struct list_head run_list;
    struct task_struct *run_task;
    struct kvm_run *kvm_run;
    pgd_t *pgdir;

    spinlock_t vpa_update_lock;
    struct kvmppc_vpa vpa;
    struct kvmppc_vpa dtl;
    struct dtl_entry *dtl_ptr;
    unsigned long dtl_index;
    u64 stolen_logged;
    struct kvmppc_vpa slb_shadow;
#endif
};

/* Values for vcpu->arch.state */
#define KVMPPC_VCPU_STOPPED     0
#define KVMPPC_VCPU_BUSY_IN_HOST    1
#define KVMPPC_VCPU_RUNNABLE        2

/* Values for vcpu->arch.io_gpr */
#define KVM_MMIO_REG_MASK   0x001f
#define KVM_MMIO_REG_EXT_MASK   0xffe0
#define KVM_MMIO_REG_GPR    0x0000
#define KVM_MMIO_REG_FPR    0x0020
#define KVM_MMIO_REG_QPR    0x0040
#define KVM_MMIO_REG_FQPR   0x0060

#define __KVM_HAVE_ARCH_WQP

#endif /* __POWERPC_KVM_HOST_H__ */