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KVM: Fix memory slot management functions for guest smp
The memory slot management functions were oriented against vcpu 0, where they should be kvm-wide. This causes hangs starting X on guest smp. Fix by making the functions (and resultant tail in the mmu) non-vcpu-specific. Unfortunately this reduces the efficiency of the mmu object cache a bit. We may have to revisit this later. Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity
parent
d55e2cb201
commit
90cb0529dd
@ -535,8 +535,8 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu);
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int kvm_mmu_setup(struct kvm_vcpu *vcpu);
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int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
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void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
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void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
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void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
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void kvm_mmu_zap_all(struct kvm *kvm);
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hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
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#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
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@ -238,23 +238,6 @@ static void vcpu_load(struct kvm_vcpu *vcpu)
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kvm_arch_ops->vcpu_load(vcpu);
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}
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/*
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* Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
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* if the slot is not populated.
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*/
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static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
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{
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struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
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mutex_lock(&vcpu->mutex);
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if (!vcpu->vmcs) {
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mutex_unlock(&vcpu->mutex);
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return NULL;
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}
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kvm_arch_ops->vcpu_load(vcpu);
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return vcpu;
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}
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static void vcpu_put(struct kvm_vcpu *vcpu)
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{
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kvm_arch_ops->vcpu_put(vcpu);
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@ -663,13 +646,6 @@ void fx_init(struct kvm_vcpu *vcpu)
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}
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EXPORT_SYMBOL_GPL(fx_init);
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static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
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{
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spin_lock(&vcpu->kvm->lock);
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kvm_mmu_slot_remove_write_access(vcpu, slot);
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spin_unlock(&vcpu->kvm->lock);
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}
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/*
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* Allocate some memory and give it an address in the guest physical address
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* space.
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@ -792,20 +768,11 @@ raced:
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*memslot = new;
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++kvm->memory_config_version;
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kvm_mmu_slot_remove_write_access(kvm, mem->slot);
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kvm_flush_remote_tlbs(kvm);
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spin_unlock(&kvm->lock);
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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struct kvm_vcpu *vcpu;
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vcpu = vcpu_load_slot(kvm, i);
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if (!vcpu)
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continue;
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if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
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do_remove_write_access(vcpu, mem->slot);
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kvm_mmu_reset_context(vcpu);
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vcpu_put(vcpu);
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}
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kvm_free_physmem_slot(&old, &new);
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return 0;
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@ -826,7 +793,6 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
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struct kvm_memory_slot *memslot;
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int r, i;
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int n;
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int cleared;
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unsigned long any = 0;
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spin_lock(&kvm->lock);
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@ -855,23 +821,11 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
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if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
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goto out;
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if (any) {
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cleared = 0;
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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struct kvm_vcpu *vcpu;
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vcpu = vcpu_load_slot(kvm, i);
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if (!vcpu)
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continue;
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if (!cleared) {
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do_remove_write_access(vcpu, log->slot);
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memset(memslot->dirty_bitmap, 0, n);
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cleared = 1;
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}
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kvm_arch_ops->tlb_flush(vcpu);
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vcpu_put(vcpu);
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}
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}
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spin_lock(&kvm->lock);
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kvm_mmu_slot_remove_write_access(kvm, log->slot);
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kvm_flush_remote_tlbs(kvm);
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memset(memslot->dirty_bitmap, 0, n);
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spin_unlock(&kvm->lock);
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r = 0;
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@ -920,13 +874,9 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
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break;
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kvm->naliases = n;
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spin_unlock(&kvm->lock);
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kvm_mmu_zap_all(kvm);
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vcpu_load(&kvm->vcpus[0]);
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spin_lock(&kvm->lock);
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kvm_mmu_zap_all(&kvm->vcpus[0]);
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spin_unlock(&kvm->lock);
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vcpu_put(&kvm->vcpus[0]);
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return 0;
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@ -281,24 +281,15 @@ static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc,
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return p;
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}
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static void mmu_memory_cache_free(struct kvm_mmu_memory_cache *mc, void *obj)
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{
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if (mc->nobjs < KVM_NR_MEM_OBJS)
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mc->objects[mc->nobjs++] = obj;
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else
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kfree(obj);
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}
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static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu)
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{
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return mmu_memory_cache_alloc(&vcpu->mmu_pte_chain_cache,
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sizeof(struct kvm_pte_chain));
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}
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static void mmu_free_pte_chain(struct kvm_vcpu *vcpu,
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struct kvm_pte_chain *pc)
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static void mmu_free_pte_chain(struct kvm_pte_chain *pc)
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{
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mmu_memory_cache_free(&vcpu->mmu_pte_chain_cache, pc);
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kfree(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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@ -307,10 +298,9 @@ static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu)
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sizeof(struct kvm_rmap_desc));
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}
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static void mmu_free_rmap_desc(struct kvm_vcpu *vcpu,
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struct kvm_rmap_desc *rd)
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static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd)
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{
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mmu_memory_cache_free(&vcpu->mmu_rmap_desc_cache, rd);
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kfree(rd);
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}
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/*
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@ -355,8 +345,7 @@ static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte)
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}
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}
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static void rmap_desc_remove_entry(struct kvm_vcpu *vcpu,
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struct page *page,
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static void rmap_desc_remove_entry(struct page *page,
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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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@ -376,10 +365,10 @@ static void rmap_desc_remove_entry(struct kvm_vcpu *vcpu,
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prev_desc->more = desc->more;
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else
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set_page_private(page,(unsigned long)desc->more | 1);
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mmu_free_rmap_desc(vcpu, desc);
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mmu_free_rmap_desc(desc);
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}
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static void rmap_remove(struct kvm_vcpu *vcpu, u64 *spte)
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static void rmap_remove(u64 *spte)
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{
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struct page *page;
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struct kvm_rmap_desc *desc;
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@ -407,7 +396,7 @@ static void rmap_remove(struct kvm_vcpu *vcpu, u64 *spte)
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while (desc) {
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for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i)
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if (desc->shadow_ptes[i] == spte) {
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rmap_desc_remove_entry(vcpu, page,
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rmap_desc_remove_entry(page,
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desc, i,
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prev_desc);
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return;
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@ -442,7 +431,7 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)
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BUG_ON(!(*spte & PT_PRESENT_MASK));
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BUG_ON(!(*spte & PT_WRITABLE_MASK));
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rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
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rmap_remove(vcpu, spte);
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rmap_remove(spte);
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set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
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kvm_flush_remote_tlbs(vcpu->kvm);
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}
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@ -464,14 +453,14 @@ static int is_empty_shadow_page(u64 *spt)
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}
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#endif
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static void kvm_mmu_free_page(struct kvm_vcpu *vcpu,
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static void kvm_mmu_free_page(struct kvm *kvm,
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struct kvm_mmu_page *page_head)
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{
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ASSERT(is_empty_shadow_page(page_head->spt));
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list_del(&page_head->link);
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mmu_memory_cache_free(&vcpu->mmu_page_cache, page_head->spt);
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mmu_memory_cache_free(&vcpu->mmu_page_header_cache, page_head);
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++vcpu->kvm->n_free_mmu_pages;
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kfree(page_head->spt);
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kfree(page_head);
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++kvm->n_free_mmu_pages;
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}
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static unsigned kvm_page_table_hashfn(gfn_t gfn)
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@ -537,8 +526,7 @@ static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu,
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pte_chain->parent_ptes[0] = parent_pte;
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}
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static void mmu_page_remove_parent_pte(struct kvm_vcpu *vcpu,
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struct kvm_mmu_page *page,
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static void mmu_page_remove_parent_pte(struct kvm_mmu_page *page,
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u64 *parent_pte)
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{
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struct kvm_pte_chain *pte_chain;
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@ -565,7 +553,7 @@ static void mmu_page_remove_parent_pte(struct kvm_vcpu *vcpu,
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pte_chain->parent_ptes[i] = NULL;
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if (i == 0) {
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hlist_del(&pte_chain->link);
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mmu_free_pte_chain(vcpu, pte_chain);
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mmu_free_pte_chain(pte_chain);
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if (hlist_empty(&page->parent_ptes)) {
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page->multimapped = 0;
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page->parent_pte = NULL;
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@ -643,7 +631,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
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return page;
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}
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static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu,
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static void kvm_mmu_page_unlink_children(struct kvm *kvm,
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struct kvm_mmu_page *page)
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{
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unsigned i;
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@ -655,10 +643,10 @@ static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu,
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if (page->role.level == PT_PAGE_TABLE_LEVEL) {
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for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
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if (pt[i] & PT_PRESENT_MASK)
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rmap_remove(vcpu, &pt[i]);
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rmap_remove(&pt[i]);
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pt[i] = 0;
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}
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kvm_flush_remote_tlbs(vcpu->kvm);
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kvm_flush_remote_tlbs(kvm);
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return;
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}
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@ -669,19 +657,18 @@ static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu,
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if (!(ent & PT_PRESENT_MASK))
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continue;
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ent &= PT64_BASE_ADDR_MASK;
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mmu_page_remove_parent_pte(vcpu, page_header(ent), &pt[i]);
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mmu_page_remove_parent_pte(page_header(ent), &pt[i]);
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}
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kvm_flush_remote_tlbs(vcpu->kvm);
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kvm_flush_remote_tlbs(kvm);
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}
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static void kvm_mmu_put_page(struct kvm_vcpu *vcpu,
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struct kvm_mmu_page *page,
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static void kvm_mmu_put_page(struct kvm_mmu_page *page,
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u64 *parent_pte)
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{
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mmu_page_remove_parent_pte(vcpu, page, parent_pte);
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mmu_page_remove_parent_pte(page, parent_pte);
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}
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static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu,
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static void kvm_mmu_zap_page(struct kvm *kvm,
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struct kvm_mmu_page *page)
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{
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u64 *parent_pte;
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@ -697,15 +684,15 @@ static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu,
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parent_pte = chain->parent_ptes[0];
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}
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BUG_ON(!parent_pte);
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kvm_mmu_put_page(vcpu, page, parent_pte);
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kvm_mmu_put_page(page, parent_pte);
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set_shadow_pte(parent_pte, 0);
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}
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kvm_mmu_page_unlink_children(vcpu, page);
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kvm_mmu_page_unlink_children(kvm, page);
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if (!page->root_count) {
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hlist_del(&page->hash_link);
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kvm_mmu_free_page(vcpu, page);
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kvm_mmu_free_page(kvm, page);
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} else
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list_move(&page->link, &vcpu->kvm->active_mmu_pages);
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list_move(&page->link, &kvm->active_mmu_pages);
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}
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static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn)
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@ -724,7 +711,7 @@ static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn)
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if (page->gfn == gfn && !page->role.metaphysical) {
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pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn,
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page->role.word);
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kvm_mmu_zap_page(vcpu, page);
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kvm_mmu_zap_page(vcpu->kvm, page);
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r = 1;
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}
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return r;
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@ -737,7 +724,7 @@ static void mmu_unshadow(struct kvm_vcpu *vcpu, gfn_t gfn)
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while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) {
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pgprintk("%s: zap %lx %x\n",
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__FUNCTION__, gfn, page->role.word);
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kvm_mmu_zap_page(vcpu, page);
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kvm_mmu_zap_page(vcpu->kvm, page);
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}
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}
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@ -1089,10 +1076,10 @@ static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
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pte = *spte;
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if (is_present_pte(pte)) {
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if (page->role.level == PT_PAGE_TABLE_LEVEL)
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rmap_remove(vcpu, spte);
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rmap_remove(spte);
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else {
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child = page_header(pte & PT64_BASE_ADDR_MASK);
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mmu_page_remove_parent_pte(vcpu, child, spte);
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mmu_page_remove_parent_pte(child, spte);
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}
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}
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*spte = 0;
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@ -1161,7 +1148,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
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*/
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pgprintk("misaligned: gpa %llx bytes %d role %x\n",
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gpa, bytes, page->role.word);
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kvm_mmu_zap_page(vcpu, page);
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kvm_mmu_zap_page(vcpu->kvm, page);
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continue;
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}
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page_offset = offset;
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@ -1207,7 +1194,7 @@ void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
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page = container_of(vcpu->kvm->active_mmu_pages.prev,
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struct kvm_mmu_page, link);
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kvm_mmu_zap_page(vcpu, page);
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kvm_mmu_zap_page(vcpu->kvm, page);
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}
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}
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EXPORT_SYMBOL_GPL(kvm_mmu_free_some_pages);
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@ -1219,7 +1206,7 @@ static void free_mmu_pages(struct kvm_vcpu *vcpu)
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while (!list_empty(&vcpu->kvm->active_mmu_pages)) {
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page = container_of(vcpu->kvm->active_mmu_pages.next,
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struct kvm_mmu_page, link);
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kvm_mmu_zap_page(vcpu, page);
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kvm_mmu_zap_page(vcpu->kvm, page);
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}
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free_page((unsigned long)vcpu->mmu.pae_root);
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}
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@ -1277,9 +1264,8 @@ void kvm_mmu_destroy(struct kvm_vcpu *vcpu)
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mmu_free_memory_caches(vcpu);
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}
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void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot)
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void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
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{
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struct kvm *kvm = vcpu->kvm;
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struct kvm_mmu_page *page;
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list_for_each_entry(page, &kvm->active_mmu_pages, link) {
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@ -1293,27 +1279,20 @@ void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot)
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for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
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/* avoid RMW */
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if (pt[i] & PT_WRITABLE_MASK) {
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rmap_remove(vcpu, &pt[i]);
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rmap_remove(&pt[i]);
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pt[i] &= ~PT_WRITABLE_MASK;
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}
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}
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}
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void kvm_mmu_zap_all(struct kvm_vcpu *vcpu)
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void kvm_mmu_zap_all(struct kvm *kvm)
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{
|
||||
destroy_kvm_mmu(vcpu);
|
||||
struct kvm_mmu_page *page, *node;
|
||||
|
||||
while (!list_empty(&vcpu->kvm->active_mmu_pages)) {
|
||||
struct kvm_mmu_page *page;
|
||||
list_for_each_entry_safe(page, node, &kvm->active_mmu_pages, link)
|
||||
kvm_mmu_zap_page(kvm, page);
|
||||
|
||||
page = container_of(vcpu->kvm->active_mmu_pages.next,
|
||||
struct kvm_mmu_page, link);
|
||||
kvm_mmu_zap_page(vcpu, page);
|
||||
}
|
||||
|
||||
mmu_free_memory_caches(vcpu);
|
||||
kvm_flush_remote_tlbs(vcpu->kvm);
|
||||
init_kvm_mmu(vcpu);
|
||||
kvm_flush_remote_tlbs(kvm);
|
||||
}
|
||||
|
||||
void kvm_mmu_module_exit(void)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user