arch/powerpc/kvm/book3s_mmu_hpte.c

Source file repositories/reference/linux-study-clean/arch/powerpc/kvm/book3s_mmu_hpte.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kvm/book3s_mmu_hpte.c
Extension
.c
Size
9282 bytes
Lines
381
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *     Alexander Graf <agraf@suse.de>
 */

#include <linux/kvm_host.h>
#include <linux/hash.h>
#include <linux/slab.h>
#include <linux/rculist.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_pr.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);
}

#ifdef CONFIG_PPC_BOOK3S_64
static inline u64 kvmppc_mmu_hash_vpte_64k(u64 vpage)
{
	return hash_64((vpage & 0xffffffff0ULL) >> 4,
		       HPTEG_HASH_BITS_VPTE_64K);
}
#endif

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]);

#ifdef CONFIG_PPC_BOOK3S_64
	/* Add to vPTE_64k list */
	index = kvmppc_mmu_hash_vpte_64k(pte->pte.vpage);
	hlist_add_head_rcu(&pte->list_vpte_64k,
			   &vcpu3s->hpte_hash_vpte_64k[index]);
#endif

	vcpu3s->hpte_cache_count++;

Annotation

Implementation Notes