book3s_mmu_hpte.c

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/*
 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *     Alexander Graf <[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.
 */

#include <linux/kvm_host.h>
#include <linux/hash.h>
#include <linux/slab.h>

#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/hw_irq.h>

#include "trace.h"

#define PTE_SIZE    12

static struct kmem_cache *hpte_cache;

static inline u64 kvmppc_mmu_hash_pte(u64 eaddr)
{
    return hash_64(eaddr >> PTE_SIZE, HPTEG_HASH_BITS_PTE);
}

static inline u64 kvmppc_mmu_hash_pte_long(u64 eaddr)
{
    return hash_64((eaddr & 0x0ffff000) >> PTE_SIZE,
               HPTEG_HASH_BITS_PTE_LONG);
}

static inline u64 kvmppc_mmu_hash_vpte(u64 vpage)
{
    return hash_64(vpage & 0xfffffffffULL, HPTEG_HASH_BITS_VPTE);
}

static inline u64 kvmppc_mmu_hash_vpte_long(u64 vpage)
{
    return hash_64((vpage & 0xffffff000ULL) >> 12,
               HPTEG_HASH_BITS_VPTE_LONG);
}

void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
    u64 index;
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

    trace_kvm_book3s_mmu_map(pte);

    spin_lock(&vcpu3s->mmu_lock);

    /* Add to ePTE list */
    index = kvmppc_mmu_hash_pte(pte->pte.eaddr);
    hlist_add_head_rcu(&pte->list_pte, &vcpu3s->hpte_hash_pte[index]);

    /* Add to ePTE_long list */
    index = kvmppc_mmu_hash_pte_long(pte->pte.eaddr);
    hlist_add_head_rcu(&pte->list_pte_long,
               &vcpu3s->hpte_hash_pte_long[index]);

    /* Add to vPTE list */
    index = kvmppc_mmu_hash_vpte(pte->pte.vpage);
    hlist_add_head_rcu(&pte->list_vpte, &vcpu3s->hpte_hash_vpte[index]);

    /* Add to vPTE_long list */
    index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
    hlist_add_head_rcu(&pte->list_vpte_long,
               &vcpu3s->hpte_hash_vpte_long[index]);

    spin_unlock(&vcpu3s->mmu_lock);
}

static void free_pte_rcu(struct rcu_head *head)
{
    struct hpte_cache *pte = container_of(head, struct hpte_cache, rcu_head);
    kmem_cache_free(hpte_cache, pte);
}

static void invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

    trace_kvm_book3s_mmu_invalidate(pte);

    /* Different for 32 and 64 bit */
    kvmppc_mmu_invalidate_pte(vcpu, pte);

    spin_lock(&vcpu3s->mmu_lock);

    /* pte already invalidated in between? */
    if (hlist_unhashed(&pte->list_pte)) {
        spin_unlock(&vcpu3s->mmu_lock);
        return;
    }

    hlist_del_init_rcu(&pte->list_pte);
    hlist_del_init_rcu(&pte->list_pte_long);
    hlist_del_init_rcu(&pte->list_vpte);
    hlist_del_init_rcu(&pte->list_vpte_long);

    if (pte->pte.may_write)
        kvm_release_pfn_dirty(pte->pfn);
    else
        kvm_release_pfn_clean(pte->pfn);

    spin_unlock(&vcpu3s->mmu_lock);

    vcpu3s->hpte_cache_count--;
    call_rcu(&pte->rcu_head, free_pte_rcu);
}

static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
    struct hpte_cache *pte;
    struct hlist_node *node;
    int i;

    rcu_read_lock();

    for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
        struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];

        hlist_for_each_entry_rcu(pte, node, list, list_vpte_long)
            invalidate_pte(vcpu, pte);
    }

    rcu_read_unlock();
}

static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
    struct hlist_head *list;
    struct hlist_node *node;
    struct hpte_cache *pte;

    /* Find the list of entries in the map */
    list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];

    rcu_read_lock();

    /* Check the list for matching entries and invalidate */
    hlist_for_each_entry_rcu(pte, node, list, list_pte)
        if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
            invalidate_pte(vcpu, pte);

    rcu_read_unlock();
}

static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
    struct hlist_head *list;
    struct hlist_node *node;
    struct hpte_cache *pte;

    /* Find the list of entries in the map */
    list = &vcpu3s->hpte_hash_pte_long[
            kvmppc_mmu_hash_pte_long(guest_ea)];

    rcu_read_lock();

    /* Check the list for matching entries and invalidate */
    hlist_for_each_entry_rcu(pte, node, list, list_pte_long)
        if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
            invalidate_pte(vcpu, pte);

    rcu_read_unlock();
}

void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
{
    trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
    guest_ea &= ea_mask;

    switch (ea_mask) {
    case ~0xfffUL:
        kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
        break;
    case 0x0ffff000:
        kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
        break;
    case 0:
        /* Doing a complete flush -> start from scratch */
        kvmppc_mmu_pte_flush_all(vcpu);
        break;
    default:
        WARN_ON(1);
        break;
    }
}

/* Flush with mask 0xfffffffff */
static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
    struct hlist_head *list;
    struct hlist_node *node;
    struct hpte_cache *pte;
    u64 vp_mask = 0xfffffffffULL;

    list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];

    rcu_read_lock();

    /* Check the list for matching entries and invalidate */
    hlist_for_each_entry_rcu(pte, node, list, list_vpte)
        if ((pte->pte.vpage & vp_mask) == guest_vp)
            invalidate_pte(vcpu, pte);

    rcu_read_unlock();
}

/* Flush with mask 0xffffff000 */
static void kvmppc_mmu_pte_vflush_long(struct kvm_vcpu *vcpu, u64 guest_vp)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
    struct hlist_head *list;
    struct hlist_node *node;
    struct hpte_cache *pte;
    u64 vp_mask = 0xffffff000ULL;

    list = &vcpu3s->hpte_hash_vpte_long[
        kvmppc_mmu_hash_vpte_long(guest_vp)];

    rcu_read_lock();

    /* Check the list for matching entries and invalidate */
    hlist_for_each_entry_rcu(pte, node, list, list_vpte_long)
        if ((pte->pte.vpage & vp_mask) == guest_vp)
            invalidate_pte(vcpu, pte);

    rcu_read_unlock();
}

void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
{
    trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
    guest_vp &= vp_mask;

    switch(vp_mask) {
    case 0xfffffffffULL:
        kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
        break;
    case 0xffffff000ULL:
        kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
        break;
    default:
        WARN_ON(1);
        return;
    }
}

void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
    struct hlist_node *node;
    struct hpte_cache *pte;
    int i;

    trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);

    rcu_read_lock();

    for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
        struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];

        hlist_for_each_entry_rcu(pte, node, list, list_vpte_long)
            if ((pte->pte.raddr >= pa_start) &&
                (pte->pte.raddr < pa_end))
                invalidate_pte(vcpu, pte);
    }

    rcu_read_unlock();
}

struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
    struct hpte_cache *pte;

    pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
    vcpu3s->hpte_cache_count++;

    if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
        kvmppc_mmu_pte_flush_all(vcpu);

    return pte;
}

void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
{
    kvmppc_mmu_pte_flush(vcpu, 0, 0);
}

static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
{
    int i;

    for (i = 0; i < len; i++)
        INIT_HLIST_HEAD(&hash_list[i]);
}

int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
{
    struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

    /* init hpte lookup hashes */
    kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
                  ARRAY_SIZE(vcpu3s->hpte_hash_pte));
    kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
                  ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
    kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
                  ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
    kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
                  ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));

    spin_lock_init(&vcpu3s->mmu_lock);

    return 0;
}

int kvmppc_mmu_hpte_sysinit(void)
{
    /* init hpte slab cache */
    hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
                       sizeof(struct hpte_cache), 0, NULL);

    return 0;
}

void kvmppc_mmu_hpte_sysexit(void)
{
    kmem_cache_destroy(hpte_cache);
}