Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...

[sfrench/cifs-2.6.git] / virt / kvm / kvm_main.c

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c82ae24926340cfa40ad8c3bbc9f65dd79c32fff..f032806a212f9d8e02faa7823f65262813d82015 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -422,9 +422,6 @@ static struct kvm *kvm_create_vm(void)
        spin_lock(&kvm_lock);
        list_add(&kvm->vm_list, &vm_list);
        spin_unlock(&kvm_lock);
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
-       kvm_coalesced_mmio_init(kvm);
-#endif
 out:
        return kvm;
 
@@ -560,6 +557,10 @@ int __kvm_set_memory_region(struct kvm *kvm,
        base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
        npages = mem->memory_size >> PAGE_SHIFT;
 
+       r = -EINVAL;
+       if (npages > KVM_MEM_MAX_NR_PAGES)
+               goto out;
+
        if (!npages)
                mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 
@@ -833,7 +834,7 @@ EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
 {
        int i;
-       struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
+       struct kvm_memslots *slots = kvm_memslots(kvm);
 
        for (i = 0; i < slots->nmemslots; ++i) {
                struct kvm_memory_slot *memslot = &slots->memslots[i];
@@ -855,7 +856,7 @@ struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 {
        int i;
-       struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
+       struct kvm_memslots *slots = kvm_memslots(kvm);
 
        gfn = unalias_gfn_instantiation(kvm, gfn);
        for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
@@ -899,7 +900,7 @@ out:
 int memslot_id(struct kvm *kvm, gfn_t gfn)
 {
        int i;
-       struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
+       struct kvm_memslots *slots = kvm_memslots(kvm);
        struct kvm_memory_slot *memslot = NULL;
 
        gfn = unalias_gfn(kvm, gfn);
@@ -914,6 +915,11 @@ int memslot_id(struct kvm *kvm, gfn_t gfn)
        return memslot - slots->memslots;
 }
 
+static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
+{
+       return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
+}
+
 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 {
        struct kvm_memory_slot *slot;
@@ -922,7 +928,7 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
        slot = gfn_to_memslot_unaliased(kvm, gfn);
        if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
                return bad_hva();
-       return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
+       return gfn_to_hva_memslot(slot, gfn);
 }
 EXPORT_SYMBOL_GPL(gfn_to_hva);
 
@@ -972,11 +978,6 @@ pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
 }
 EXPORT_SYMBOL_GPL(gfn_to_pfn);
 
-static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
-{
-       return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
-}
-
 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
                         struct kvm_memory_slot *slot, gfn_t gfn)
 {
@@ -1190,13 +1191,8 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
        memslot = gfn_to_memslot_unaliased(kvm, gfn);
        if (memslot && memslot->dirty_bitmap) {
                unsigned long rel_gfn = gfn - memslot->base_gfn;
-               unsigned long *p = memslot->dirty_bitmap +
-                                       rel_gfn / BITS_PER_LONG;
-               int offset = rel_gfn % BITS_PER_LONG;
 
-               /* avoid RMW */
-               if (!generic_test_le_bit(offset, p))
-                       generic___set_le_bit(offset, p);
+               generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
        }
 }
 
@@ -1609,7 +1605,6 @@ static long kvm_vm_ioctl(struct file *filp,
                r = -EFAULT;
                if (copy_from_user(&zone, argp, sizeof zone))
                        goto out;
-               r = -ENXIO;
                r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
                if (r)
                        goto out;
@@ -1621,7 +1616,6 @@ static long kvm_vm_ioctl(struct file *filp,
                r = -EFAULT;
                if (copy_from_user(&zone, argp, sizeof zone))
                        goto out;
-               r = -ENXIO;
                r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
                if (r)
                        goto out;
@@ -1755,12 +1749,19 @@ static struct file_operations kvm_vm_fops = {
 
 static int kvm_dev_ioctl_create_vm(void)
 {
-       int fd;
+       int fd, r;
        struct kvm *kvm;
 
        kvm = kvm_create_vm();
        if (IS_ERR(kvm))
                return PTR_ERR(kvm);
+#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
+       r = kvm_coalesced_mmio_init(kvm);
+       if (r < 0) {
+               kvm_put_kvm(kvm);
+               return r;
+       }
+#endif
        fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
        if (fd < 0)
                kvm_put_kvm(kvm);
@@ -1928,11 +1929,6 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
                       cpu);
                hardware_disable(NULL);
                break;
-       case CPU_UP_CANCELED:
-               printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
-                      cpu);
-               smp_call_function_single(cpu, hardware_disable, NULL, 1);
-               break;
        case CPU_ONLINE:
                printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
                       cpu);
@@ -1991,7 +1987,9 @@ int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
                     int len, const void *val)
 {
        int i;
-       struct kvm_io_bus *bus = rcu_dereference(kvm->buses[bus_idx]);
+       struct kvm_io_bus *bus;
+
+       bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
        for (i = 0; i < bus->dev_count; i++)
                if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
                        return 0;
@@ -2003,8 +2001,9 @@ int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
                    int len, void *val)
 {
        int i;
-       struct kvm_io_bus *bus = rcu_dereference(kvm->buses[bus_idx]);
+       struct kvm_io_bus *bus;
 
+       bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
        for (i = 0; i < bus->dev_count; i++)
                if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
                        return 0;
@@ -2179,7 +2178,7 @@ static void kvm_sched_out(struct preempt_notifier *pn,
        kvm_arch_vcpu_put(vcpu);
 }
 
-int kvm_init(void *opaque, unsigned int vcpu_size,
+int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
                  struct module *module)
 {
        int r;
@@ -2229,8 +2228,9 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
                goto out_free_4;
 
        /* A kmem cache lets us meet the alignment requirements of fx_save. */
-       kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
-                                          __alignof__(struct kvm_vcpu),
+       if (!vcpu_align)
+               vcpu_align = __alignof__(struct kvm_vcpu);
+       kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
                                           0, NULL);
        if (!kvm_vcpu_cache) {
                r = -ENOMEM;
@@ -2279,7 +2279,6 @@ EXPORT_SYMBOL_GPL(kvm_init);
 
 void kvm_exit(void)
 {
-       tracepoint_synchronize_unregister();
        kvm_exit_debug();
        misc_deregister(&kvm_dev);
        kmem_cache_destroy(kvm_vcpu_cache);