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KVM: MMU: abstract the operation of rmap
Abstract the operation of rmap to spte_list, then we can use it for the reverse mapping of parent pte in the later patch Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Xiao Guangrong
Avi Kivity
parent
1249b96e72
commit
53c07b1878
@ -347,7 +347,7 @@ struct kvm_vcpu_arch {
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struct kvm_pv_mmu_op_buffer mmu_op_buffer;
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struct kvm_mmu_memory_cache mmu_pte_chain_cache;
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struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
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struct kvm_mmu_memory_cache mmu_pte_list_desc_cache;
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struct kvm_mmu_memory_cache mmu_page_cache;
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struct kvm_mmu_memory_cache mmu_page_header_cache;
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@ -148,7 +148,7 @@ module_param(oos_shadow, bool, 0644);
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#define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | PT_USER_MASK \
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| PT64_NX_MASK)
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#define RMAP_EXT 4
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#define PTE_LIST_EXT 4
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#define ACC_EXEC_MASK 1
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#define ACC_WRITE_MASK PT_WRITABLE_MASK
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@ -164,9 +164,9 @@ module_param(oos_shadow, bool, 0644);
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#define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level)
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struct kvm_rmap_desc {
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u64 *sptes[RMAP_EXT];
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struct kvm_rmap_desc *more;
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struct pte_list_desc {
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u64 *sptes[PTE_LIST_EXT];
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struct pte_list_desc *more;
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};
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struct kvm_shadow_walk_iterator {
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@ -185,7 +185,7 @@ struct kvm_shadow_walk_iterator {
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typedef void (*mmu_parent_walk_fn) (struct kvm_mmu_page *sp, u64 *spte);
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static struct kmem_cache *pte_chain_cache;
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static struct kmem_cache *rmap_desc_cache;
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static struct kmem_cache *pte_list_desc_cache;
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static struct kmem_cache *mmu_page_header_cache;
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static struct percpu_counter kvm_total_used_mmu_pages;
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@ -401,8 +401,8 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
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pte_chain_cache, 4);
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if (r)
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goto out;
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r = mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache,
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rmap_desc_cache, 4 + PTE_PREFETCH_NUM);
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r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache,
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pte_list_desc_cache, 4 + PTE_PREFETCH_NUM);
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if (r)
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goto out;
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r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8);
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@ -416,8 +416,10 @@ out:
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static void mmu_free_memory_caches(struct kvm_vcpu *vcpu)
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{
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mmu_free_memory_cache(&vcpu->arch.mmu_pte_chain_cache, pte_chain_cache);
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mmu_free_memory_cache(&vcpu->arch.mmu_rmap_desc_cache, rmap_desc_cache);
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mmu_free_memory_cache(&vcpu->arch.mmu_pte_chain_cache,
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pte_chain_cache);
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mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache,
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pte_list_desc_cache);
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mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache);
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mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache,
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mmu_page_header_cache);
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@ -444,15 +446,15 @@ static void mmu_free_pte_chain(struct kvm_pte_chain *pc)
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kmem_cache_free(pte_chain_cache, pc);
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}
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static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu)
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static struct pte_list_desc *mmu_alloc_pte_list_desc(struct kvm_vcpu *vcpu)
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{
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return mmu_memory_cache_alloc(&vcpu->arch.mmu_rmap_desc_cache,
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sizeof(struct kvm_rmap_desc));
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return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache,
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sizeof(struct pte_list_desc));
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}
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static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd)
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static void mmu_free_pte_list_desc(struct pte_list_desc *pte_list_desc)
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{
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kmem_cache_free(rmap_desc_cache, rd);
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kmem_cache_free(pte_list_desc_cache, pte_list_desc);
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}
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static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index)
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@ -589,10 +591,139 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
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return level - 1;
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}
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/*
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* Pte mapping structures:
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*
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* If pte_list bit zero is zero, then pte_list point to the spte.
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*
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* If pte_list bit zero is one, (then pte_list & ~1) points to a struct
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* pte_list_desc containing more mappings.
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*
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* Returns the number of pte entries before the spte was added or zero if
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* the spte was not added.
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*
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*/
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static int pte_list_add(struct kvm_vcpu *vcpu, u64 *spte,
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unsigned long *pte_list)
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{
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struct pte_list_desc *desc;
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int i, count = 0;
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if (!*pte_list) {
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rmap_printk("pte_list_add: %p %llx 0->1\n", spte, *spte);
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*pte_list = (unsigned long)spte;
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} else if (!(*pte_list & 1)) {
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rmap_printk("pte_list_add: %p %llx 1->many\n", spte, *spte);
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desc = mmu_alloc_pte_list_desc(vcpu);
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desc->sptes[0] = (u64 *)*pte_list;
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desc->sptes[1] = spte;
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*pte_list = (unsigned long)desc | 1;
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++count;
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} else {
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rmap_printk("pte_list_add: %p %llx many->many\n", spte, *spte);
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desc = (struct pte_list_desc *)(*pte_list & ~1ul);
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while (desc->sptes[PTE_LIST_EXT-1] && desc->more) {
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desc = desc->more;
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count += PTE_LIST_EXT;
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}
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if (desc->sptes[PTE_LIST_EXT-1]) {
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desc->more = mmu_alloc_pte_list_desc(vcpu);
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desc = desc->more;
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}
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for (i = 0; desc->sptes[i]; ++i)
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++count;
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desc->sptes[i] = spte;
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}
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return count;
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}
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static u64 *pte_list_next(unsigned long *pte_list, u64 *spte)
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{
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struct pte_list_desc *desc;
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u64 *prev_spte;
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int i;
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if (!*pte_list)
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return NULL;
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else if (!(*pte_list & 1)) {
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if (!spte)
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return (u64 *)*pte_list;
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return NULL;
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}
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desc = (struct pte_list_desc *)(*pte_list & ~1ul);
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prev_spte = NULL;
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while (desc) {
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for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) {
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if (prev_spte == spte)
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return desc->sptes[i];
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prev_spte = desc->sptes[i];
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}
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desc = desc->more;
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}
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return NULL;
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}
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static void
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pte_list_desc_remove_entry(unsigned long *pte_list, struct pte_list_desc *desc,
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int i, struct pte_list_desc *prev_desc)
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{
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int j;
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for (j = PTE_LIST_EXT - 1; !desc->sptes[j] && j > i; --j)
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;
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desc->sptes[i] = desc->sptes[j];
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desc->sptes[j] = NULL;
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if (j != 0)
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return;
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if (!prev_desc && !desc->more)
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*pte_list = (unsigned long)desc->sptes[0];
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else
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if (prev_desc)
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prev_desc->more = desc->more;
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else
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*pte_list = (unsigned long)desc->more | 1;
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mmu_free_pte_list_desc(desc);
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}
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static void pte_list_remove(u64 *spte, unsigned long *pte_list)
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{
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struct pte_list_desc *desc;
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struct pte_list_desc *prev_desc;
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int i;
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if (!*pte_list) {
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printk(KERN_ERR "pte_list_remove: %p 0->BUG\n", spte);
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BUG();
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} else if (!(*pte_list & 1)) {
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rmap_printk("pte_list_remove: %p 1->0\n", spte);
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if ((u64 *)*pte_list != spte) {
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printk(KERN_ERR "pte_list_remove: %p 1->BUG\n", spte);
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BUG();
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}
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*pte_list = 0;
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} else {
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rmap_printk("pte_list_remove: %p many->many\n", spte);
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desc = (struct pte_list_desc *)(*pte_list & ~1ul);
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prev_desc = NULL;
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while (desc) {
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for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i)
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if (desc->sptes[i] == spte) {
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pte_list_desc_remove_entry(pte_list,
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desc, i,
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prev_desc);
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return;
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}
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prev_desc = desc;
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desc = desc->more;
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}
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pr_err("pte_list_remove: %p many->many\n", spte);
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BUG();
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}
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}
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/*
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* Take gfn and return the reverse mapping to it.
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*/
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static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level)
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{
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struct kvm_memory_slot *slot;
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@ -607,122 +738,35 @@ static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level)
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return &linfo->rmap_pde;
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}
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/*
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* Reverse mapping data structures:
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*
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* If rmapp bit zero is zero, then rmapp point to the shadw page table entry
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* that points to page_address(page).
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*
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* If rmapp bit zero is one, (then rmap & ~1) points to a struct kvm_rmap_desc
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* containing more mappings.
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*
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* Returns the number of rmap entries before the spte was added or zero if
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* the spte was not added.
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*
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*/
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static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
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{
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struct kvm_mmu_page *sp;
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struct kvm_rmap_desc *desc;
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unsigned long *rmapp;
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int i, count = 0;
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if (!is_rmap_spte(*spte))
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return count;
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return 0;
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sp = page_header(__pa(spte));
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kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn);
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rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
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if (!*rmapp) {
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rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte);
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*rmapp = (unsigned long)spte;
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} else if (!(*rmapp & 1)) {
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rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte);
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desc = mmu_alloc_rmap_desc(vcpu);
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desc->sptes[0] = (u64 *)*rmapp;
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desc->sptes[1] = spte;
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*rmapp = (unsigned long)desc | 1;
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++count;
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} else {
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rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte);
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desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
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while (desc->sptes[RMAP_EXT-1] && desc->more) {
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desc = desc->more;
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count += RMAP_EXT;
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}
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if (desc->sptes[RMAP_EXT-1]) {
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desc->more = mmu_alloc_rmap_desc(vcpu);
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desc = desc->more;
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}
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for (i = 0; desc->sptes[i]; ++i)
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++count;
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desc->sptes[i] = spte;
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}
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return count;
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return pte_list_add(vcpu, spte, rmapp);
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}
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static void rmap_desc_remove_entry(unsigned long *rmapp,
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struct kvm_rmap_desc *desc,
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int i,
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struct kvm_rmap_desc *prev_desc)
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static u64 *rmap_next(struct kvm *kvm, unsigned long *rmapp, u64 *spte)
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{
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int j;
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for (j = RMAP_EXT - 1; !desc->sptes[j] && j > i; --j)
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;
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desc->sptes[i] = desc->sptes[j];
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desc->sptes[j] = NULL;
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if (j != 0)
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return;
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if (!prev_desc && !desc->more)
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*rmapp = (unsigned long)desc->sptes[0];
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else
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if (prev_desc)
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prev_desc->more = desc->more;
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else
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*rmapp = (unsigned long)desc->more | 1;
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mmu_free_rmap_desc(desc);
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return pte_list_next(rmapp, spte);
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}
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static void rmap_remove(struct kvm *kvm, u64 *spte)
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{
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struct kvm_rmap_desc *desc;
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struct kvm_rmap_desc *prev_desc;
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struct kvm_mmu_page *sp;
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gfn_t gfn;
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unsigned long *rmapp;
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int i;
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sp = page_header(__pa(spte));
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gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt);
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rmapp = gfn_to_rmap(kvm, gfn, sp->role.level);
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if (!*rmapp) {
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printk(KERN_ERR "rmap_remove: %p 0->BUG\n", spte);
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BUG();
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} else if (!(*rmapp & 1)) {
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rmap_printk("rmap_remove: %p 1->0\n", spte);
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if ((u64 *)*rmapp != spte) {
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printk(KERN_ERR "rmap_remove: %p 1->BUG\n", spte);
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BUG();
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}
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*rmapp = 0;
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} else {
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rmap_printk("rmap_remove: %p many->many\n", spte);
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desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
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prev_desc = NULL;
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while (desc) {
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for (i = 0; i < RMAP_EXT && desc->sptes[i]; ++i)
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if (desc->sptes[i] == spte) {
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rmap_desc_remove_entry(rmapp,
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desc, i,
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prev_desc);
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return;
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}
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prev_desc = desc;
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desc = desc->more;
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}
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pr_err("rmap_remove: %p many->many\n", spte);
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BUG();
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}
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pte_list_remove(spte, rmapp);
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}
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static int set_spte_track_bits(u64 *sptep, u64 new_spte)
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@ -752,32 +796,6 @@ static void drop_spte(struct kvm *kvm, u64 *sptep, u64 new_spte)
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rmap_remove(kvm, sptep);
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}
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static u64 *rmap_next(struct kvm *kvm, unsigned long *rmapp, u64 *spte)
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{
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struct kvm_rmap_desc *desc;
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u64 *prev_spte;
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int i;
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if (!*rmapp)
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return NULL;
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else if (!(*rmapp & 1)) {
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if (!spte)
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return (u64 *)*rmapp;
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return NULL;
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}
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desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
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prev_spte = NULL;
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while (desc) {
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for (i = 0; i < RMAP_EXT && desc->sptes[i]; ++i) {
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if (prev_spte == spte)
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return desc->sptes[i];
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prev_spte = desc->sptes[i];
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}
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desc = desc->more;
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}
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return NULL;
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}
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static int rmap_write_protect(struct kvm *kvm, u64 gfn)
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{
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unsigned long *rmapp;
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@ -3601,8 +3619,8 @@ static void mmu_destroy_caches(void)
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{
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if (pte_chain_cache)
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kmem_cache_destroy(pte_chain_cache);
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if (rmap_desc_cache)
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kmem_cache_destroy(rmap_desc_cache);
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if (pte_list_desc_cache)
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kmem_cache_destroy(pte_list_desc_cache);
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if (mmu_page_header_cache)
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kmem_cache_destroy(mmu_page_header_cache);
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}
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@ -3614,10 +3632,10 @@ int kvm_mmu_module_init(void)
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0, 0, NULL);
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if (!pte_chain_cache)
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goto nomem;
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rmap_desc_cache = kmem_cache_create("kvm_rmap_desc",
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sizeof(struct kvm_rmap_desc),
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pte_list_desc_cache = kmem_cache_create("pte_list_desc",
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sizeof(struct pte_list_desc),
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0, 0, NULL);
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if (!rmap_desc_cache)
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if (!pte_list_desc_cache)
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goto nomem;
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mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header",
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