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yaml
---
r: 202381
b: refs/heads/master
c: 7741909
h: refs/heads/master
i:
  202379: 27f70de
v: v3
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Alexander Graf authored and Avi Kivity committed Aug 1, 2010
1 parent f565474 commit 24223ea
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 84754cd8fca66ed476585eabad68cacf42834199
refs/heads/master: 7741909bf19d9437a6aa3559c0470a640f637dce
277 changes: 277 additions & 0 deletions trunk/arch/powerpc/kvm/book3s_mmu_hpte.c
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/*
* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
*
* Authors:
* Alexander Graf <agraf@suse.de>
*
* 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>

#define PTE_SIZE 12

/* #define DEBUG_MMU */

#ifdef DEBUG_MMU
#define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
#else
#define dprintk_mmu(a, ...) do { } while(0)
#endif

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_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;

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

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

/* Add to vPTE_long list */
index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
hlist_add_head(&pte->list_vpte_long,
&vcpu->arch.hpte_hash_vpte_long[index]);
}

static void invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
dprintk_mmu("KVM: Flushing SPT: 0x%lx (0x%llx) -> 0x%llx\n",
pte->pte.eaddr, pte->pte.vpage, pte->host_va);

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

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

hlist_del(&pte->list_pte);
hlist_del(&pte->list_vpte);
hlist_del(&pte->list_vpte_long);

vcpu->arch.hpte_cache_count--;
kmem_cache_free(hpte_cache, pte);
}

static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
{
struct hpte_cache *pte;
struct hlist_node *node, *tmp;
int i;

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

hlist_for_each_entry_safe(pte, node, tmp, list, list_vpte_long)
invalidate_pte(vcpu, pte);
}
}

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

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

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

void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
{
u64 i;

dprintk_mmu("KVM: Flushing %d Shadow PTEs: 0x%lx & 0x%lx\n",
vcpu->arch.hpte_cache_count, guest_ea, ea_mask);

guest_ea &= ea_mask;

switch (ea_mask) {
case ~0xfffUL:
kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
break;
case 0x0ffff000:
/* 32-bit flush w/o segment, go through all possible segments */
for (i = 0; i < 0x100000000ULL; i += 0x10000000ULL)
kvmppc_mmu_pte_flush(vcpu, guest_ea | i, ~0xfffUL);
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 hlist_head *list;
struct hlist_node *node, *tmp;
struct hpte_cache *pte;
u64 vp_mask = 0xfffffffffULL;

list = &vcpu->arch.hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];

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

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

list = &vcpu->arch.hpte_hash_vpte_long[
kvmppc_mmu_hash_vpte_long(guest_vp)];

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

void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
{
dprintk_mmu("KVM: Flushing %d Shadow vPTEs: 0x%llx & 0x%llx\n",
vcpu->arch.hpte_cache_count, 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 hlist_node *node, *tmp;
struct hpte_cache *pte;
int i;

dprintk_mmu("KVM: Flushing %d Shadow pPTEs: 0x%lx - 0x%lx\n",
vcpu->arch.hpte_cache_count, pa_start, pa_end);

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

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

struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
{
struct hpte_cache *pte;

pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
vcpu->arch.hpte_cache_count++;

if (vcpu->arch.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)
{
/* init hpte lookup hashes */
kvmppc_mmu_hpte_init_hash(vcpu->arch.hpte_hash_pte,
ARRAY_SIZE(vcpu->arch.hpte_hash_pte));
kvmppc_mmu_hpte_init_hash(vcpu->arch.hpte_hash_vpte,
ARRAY_SIZE(vcpu->arch.hpte_hash_vpte));
kvmppc_mmu_hpte_init_hash(vcpu->arch.hpte_hash_vpte_long,
ARRAY_SIZE(vcpu->arch.hpte_hash_vpte_long));

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);
}

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