e500.h

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/*
 * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Author: Yu Liu <[email protected]>
 *         Scott Wood <[email protected]>
 *         Ashish Kalra <[email protected]>
 *         Varun Sethi <[email protected]>
 *
 * Description:
 * This file is based on arch/powerpc/kvm/44x_tlb.h and
 * arch/powerpc/include/asm/kvm_44x.h by Hollis Blanchard <[email protected]>,
 * Copyright IBM Corp. 2007-2008
 *
 * 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.
 */

#ifndef KVM_E500_H
#define KVM_E500_H

#include <linux/kvm_host.h>
#include <asm/mmu-book3e.h>
#include <asm/tlb.h>

#define E500_PID_NUM   3
#define E500_TLB_NUM   2

#define E500_TLB_VALID 1
#define E500_TLB_DIRTY 2
#define E500_TLB_BITMAP 4

struct tlbe_ref {
    pfn_t pfn;
    unsigned int flags; /* E500_TLB_* */
};

struct tlbe_priv {
    struct tlbe_ref ref; /* TLB0 only -- TLB1 uses tlb_refs */
};

#ifdef CONFIG_KVM_E500V2
struct vcpu_id_table;
#endif

struct kvmppc_e500_tlb_params {
    int entries, ways, sets;
};

struct kvmppc_vcpu_e500 {
    struct kvm_vcpu vcpu;

    /* Unmodified copy of the guest's TLB -- shared with host userspace. */
    struct kvm_book3e_206_tlb_entry *gtlb_arch;

    /* Starting entry number in gtlb_arch[] */
    int gtlb_offset[E500_TLB_NUM];

    /* KVM internal information associated with each guest TLB entry */
    struct tlbe_priv *gtlb_priv[E500_TLB_NUM];

    struct kvmppc_e500_tlb_params gtlb_params[E500_TLB_NUM];

    unsigned int gtlb_nv[E500_TLB_NUM];

    /*
     * information associated with each host TLB entry --
     * TLB1 only for now.  If/when guest TLB1 entries can be
     * mapped with host TLB0, this will be used for that too.
     *
     * We don't want to use this for guest TLB0 because then we'd
     * have the overhead of doing the translation again even if
     * the entry is still in the guest TLB (e.g. we swapped out
     * and back, and our host TLB entries got evicted).
     */
    struct tlbe_ref *tlb_refs[E500_TLB_NUM];
    unsigned int host_tlb1_nv;

    u32 svr;
    u32 l1csr0;
    u32 l1csr1;
    u32 hid0;
    u32 hid1;
    u64 mcar;

    struct page **shared_tlb_pages;
    int num_shared_tlb_pages;

    u64 *g2h_tlb1_map;
    unsigned int *h2g_tlb1_rmap;

    /* Minimum and maximum address mapped my TLB1 */
    unsigned long tlb1_min_eaddr;
    unsigned long tlb1_max_eaddr;

#ifdef CONFIG_KVM_E500V2
    u32 pid[E500_PID_NUM];

    /* vcpu id table */
    struct vcpu_id_table *idt;
#endif
};

static inline struct kvmppc_vcpu_e500 *to_e500(struct kvm_vcpu *vcpu)
{
    return container_of(vcpu, struct kvmppc_vcpu_e500, vcpu);
}


/* This geometry is the legacy default -- can be overridden by userspace */
#define KVM_E500_TLB0_WAY_SIZE      128
#define KVM_E500_TLB0_WAY_NUM       2

#define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
#define KVM_E500_TLB1_SIZE  16

#define index_of(tlbsel, esel)  (((tlbsel) << 16) | ((esel) & 0xFFFF))
#define tlbsel_of(index)    ((index) >> 16)
#define esel_of(index)      ((index) & 0xFFFF)

#define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
#define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
#define MAS2_ATTRIB_MASK \
      (MAS2_X0 | MAS2_X1)
#define MAS3_ATTRIB_MASK \
      (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
       | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)

int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500,
                ulong value);
int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu);
int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu);
int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, int ra, int rb);
int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int rt, int ra, int rb);
int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb);
int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500);
void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500);

void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);


#ifdef CONFIG_KVM_E500V2
unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
                 unsigned int as, unsigned int gid,
                 unsigned int pr, int avoid_recursion);
#endif

/* TLB helper functions */
static inline unsigned int
get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return (tlbe->mas1 >> 7) & 0x1f;
}

static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return tlbe->mas2 & 0xfffff000;
}

static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    unsigned int pgsize = get_tlb_size(tlbe);
    return 1ULL << 10 << pgsize;
}

static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    u64 bytes = get_tlb_bytes(tlbe);
    return get_tlb_eaddr(tlbe) + bytes - 1;
}

static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return tlbe->mas7_3 & ~0xfffULL;
}

static inline unsigned int
get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return (tlbe->mas1 >> 16) & 0xff;
}

static inline unsigned int
get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return (tlbe->mas1 >> 12) & 0x1;
}

static inline unsigned int
get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return (tlbe->mas1 >> 31) & 0x1;
}

static inline unsigned int
get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return (tlbe->mas1 >> 30) & 0x1;
}

static inline unsigned int
get_tlb_tsize(const struct kvm_book3e_206_tlb_entry *tlbe)
{
    return (tlbe->mas1 & MAS1_TSIZE_MASK) >> MAS1_TSIZE_SHIFT;
}

static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
{
    return vcpu->arch.pid & 0xff;
}

static inline unsigned int get_cur_as(struct kvm_vcpu *vcpu)
{
    return !!(vcpu->arch.shared->msr & (MSR_IS | MSR_DS));
}

static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu)
{
    return !!(vcpu->arch.shared->msr & MSR_PR);
}

static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu)
{
    return (vcpu->arch.shared->mas6 >> 16) & 0xff;
}

static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu)
{
    return vcpu->arch.shared->mas6 & 0x1;
}

static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu)
{
    /*
     * Manual says that tlbsel has 2 bits wide.
     * Since we only have two TLBs, only lower bit is used.
     */
    return (vcpu->arch.shared->mas0 >> 28) & 0x1;
}

static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu)
{
    return vcpu->arch.shared->mas0 & 0xfff;
}

static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu)
{
    return (vcpu->arch.shared->mas0 >> 16) & 0xfff;
}

static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
            const struct kvm_book3e_206_tlb_entry *tlbe)
{
    gpa_t gpa;

    if (!get_tlb_v(tlbe))
        return 0;

#ifndef CONFIG_KVM_BOOKE_HV
    /* Does it match current guest AS? */
    /* XXX what about IS != DS? */
    if (get_tlb_ts(tlbe) != !!(vcpu->arch.shared->msr & MSR_IS))
        return 0;
#endif

    gpa = get_tlb_raddr(tlbe);
    if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
        /* Mapping is not for RAM. */
        return 0;

    return 1;
}

static inline struct kvm_book3e_206_tlb_entry *get_entry(
    struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int entry)
{
    int offset = vcpu_e500->gtlb_offset[tlbsel];
    return &vcpu_e500->gtlb_arch[offset + entry];
}

void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
               struct kvm_book3e_206_tlb_entry *gtlbe);
void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500);

#ifdef CONFIG_KVM_BOOKE_HV
#define kvmppc_e500_get_tlb_stid(vcpu, gtlbe)       get_tlb_tid(gtlbe)
#define get_tlbmiss_tid(vcpu)           get_cur_pid(vcpu)
#define get_tlb_sts(gtlbe)              (gtlbe->mas1 & MAS1_TS)
#else
unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
                      struct kvm_book3e_206_tlb_entry *gtlbe);

static inline unsigned int get_tlbmiss_tid(struct kvm_vcpu *vcpu)
{
    struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
    unsigned int tidseld = (vcpu->arch.shared->mas4 >> 16) & 0xf;

    return vcpu_e500->pid[tidseld];
}

/* Force TS=1 for all guest mappings. */
#define get_tlb_sts(gtlbe)              (MAS1_TS)
#endif /* !BOOKE_HV */

#endif /* KVM_E500_H */