KVM: MMU: Switch to mmu spinlock

[deliverable/linux.git] / arch / x86 / kvm / mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c0b757be7b998714b95a9b0f809e9e693b3ee7f9..834698d24595667d154a20110608e2e5f4be5b97 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -971,16 +971,12 @@ static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
 {
 }
 
-static int __nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
+static int __nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write,
+                          gfn_t gfn, struct page *page)
 {
        int level = PT32E_ROOT_LEVEL;
        hpa_t table_addr = vcpu->arch.mmu.root_hpa;
        int pt_write = 0;
-       struct page *page;
-
-       down_read(&current->mm->mmap_sem);
-       page = gfn_to_page(vcpu->kvm, gfn);
-       up_read(&current->mm->mmap_sem);
 
        for (; ; level--) {
                u32 index = PT64_INDEX(v, level);
@@ -1022,9 +1018,17 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
 {
        int r;
 
-       mutex_lock(&vcpu->kvm->lock);
-       r = __nonpaging_map(vcpu, v, write, gfn);
-       mutex_unlock(&vcpu->kvm->lock);
+       struct page *page;
+
+       down_read(&current->mm->mmap_sem);
+       page = gfn_to_page(vcpu->kvm, gfn);
+
+       spin_lock(&vcpu->kvm->mmu_lock);
+       r = __nonpaging_map(vcpu, v, write, gfn, page);
+       spin_unlock(&vcpu->kvm->mmu_lock);
+
+       up_read(&current->mm->mmap_sem);
+
        return r;
 }
 
@@ -1045,7 +1049,7 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
 
        if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
                return;
-       mutex_lock(&vcpu->kvm->lock);
+       spin_lock(&vcpu->kvm->mmu_lock);
 #ifdef CONFIG_X86_64
        if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
                hpa_t root = vcpu->arch.mmu.root_hpa;
@@ -1053,7 +1057,7 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
                sp = page_header(root);
                --sp->root_count;
                vcpu->arch.mmu.root_hpa = INVALID_PAGE;
-               mutex_unlock(&vcpu->kvm->lock);
+               spin_unlock(&vcpu->kvm->mmu_lock);
                return;
        }
 #endif
@@ -1067,7 +1071,7 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
                }
                vcpu->arch.mmu.pae_root[i] = INVALID_PAGE;
        }
-       mutex_unlock(&vcpu->kvm->lock);
+       spin_unlock(&vcpu->kvm->mmu_lock);
        vcpu->arch.mmu.root_hpa = INVALID_PAGE;
 }
 
@@ -1270,9 +1274,9 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
        r = mmu_topup_memory_caches(vcpu);
        if (r)
                goto out;
-       mutex_lock(&vcpu->kvm->lock);
+       spin_lock(&vcpu->kvm->mmu_lock);
        mmu_alloc_roots(vcpu);
-       mutex_unlock(&vcpu->kvm->lock);
+       spin_unlock(&vcpu->kvm->mmu_lock);
        kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
        kvm_mmu_flush_tlb(vcpu);
 out:
@@ -1408,7 +1412,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 
        pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes);
        mmu_guess_page_from_pte_write(vcpu, gpa, new, bytes);
-       mutex_lock(&vcpu->kvm->lock);
+       spin_lock(&vcpu->kvm->mmu_lock);
        ++vcpu->kvm->stat.mmu_pte_write;
        kvm_mmu_audit(vcpu, "pre pte write");
        if (gfn == vcpu->arch.last_pt_write_gfn
@@ -1477,7 +1481,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
                }
        }
        kvm_mmu_audit(vcpu, "post pte write");
-       mutex_unlock(&vcpu->kvm->lock);
+       spin_unlock(&vcpu->kvm->mmu_lock);
        if (vcpu->arch.update_pte.page) {
                kvm_release_page_clean(vcpu->arch.update_pte.page);
                vcpu->arch.update_pte.page = NULL;
@@ -1493,15 +1497,15 @@ int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
        gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gva);
        up_read(&current->mm->mmap_sem);
 
-       mutex_lock(&vcpu->kvm->lock);
+       spin_lock(&vcpu->kvm->mmu_lock);
        r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
-       mutex_unlock(&vcpu->kvm->lock);
+       spin_unlock(&vcpu->kvm->mmu_lock);
        return r;
 }
 
 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
 {
-       mutex_lock(&vcpu->kvm->lock);
+       spin_lock(&vcpu->kvm->mmu_lock);
        while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES) {
                struct kvm_mmu_page *sp;
 
@@ -1510,7 +1514,7 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
                kvm_mmu_zap_page(vcpu->kvm, sp);
                ++vcpu->kvm->stat.mmu_recycled;
        }
-       mutex_unlock(&vcpu->kvm->lock);
+       spin_unlock(&vcpu->kvm->mmu_lock);
 }
 
 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
@@ -1642,10 +1646,10 @@ void kvm_mmu_zap_all(struct kvm *kvm)
 {
        struct kvm_mmu_page *sp, *node;
 
-       mutex_lock(&kvm->lock);
+       spin_lock(&kvm->mmu_lock);
        list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link)
                kvm_mmu_zap_page(kvm, sp);
-       mutex_unlock(&kvm->lock);
+       spin_unlock(&kvm->mmu_lock);
 
        kvm_flush_remote_tlbs(kvm);
 }