static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
-static bool kvm_rebooting;
+bool kvm_rebooting;
+EXPORT_SYMBOL_GPL(kvm_rebooting);
static bool largepages_enabled = true;
inline int kvm_is_mmio_pfn(pfn_t pfn)
{
if (pfn_valid(pfn)) {
- struct page *page = compound_head(pfn_to_page(pfn));
- return PageReserved(page);
+ int reserved;
+ struct page *tail = pfn_to_page(pfn);
+ struct page *head = compound_trans_head(tail);
+ reserved = PageReserved(head);
+ if (head != tail) {
+ /*
+ * "head" is not a dangling pointer
+ * (compound_trans_head takes care of that)
+ * but the hugepage may have been splitted
+ * from under us (and we may not hold a
+ * reference count on the head page so it can
+ * be reused before we run PageReferenced), so
+ * we've to check PageTail before returning
+ * what we just read.
+ */
+ smp_rmb();
+ if (PageTail(tail))
+ return reserved;
+ }
+ return PageReserved(tail);
}
return true;
void kvm_flush_remote_tlbs(struct kvm *kvm)
{
+ int dirty_count = kvm->tlbs_dirty;
+
+ smp_mb();
if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
++kvm->stat.remote_tlb_flush;
+ cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
}
void kvm_reload_remote_mmus(struct kvm *kvm)
idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
kvm->mmu_notifier_seq++;
- need_tlb_flush = kvm_unmap_hva(kvm, address);
+ need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
spin_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);
kvm->mmu_notifier_count++;
for (; start < end; start += PAGE_SIZE)
need_tlb_flush |= kvm_unmap_hva(kvm, start);
+ need_tlb_flush |= kvm->tlbs_dirty;
spin_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);
return young;
}
+static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long address)
+{
+ struct kvm *kvm = mmu_notifier_to_kvm(mn);
+ int young, idx;
+
+ idx = srcu_read_lock(&kvm->srcu);
+ spin_lock(&kvm->mmu_lock);
+ young = kvm_test_age_hva(kvm, address);
+ spin_unlock(&kvm->mmu_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
+
+ return young;
+}
+
static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
struct mm_struct *mm)
{
.invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
.invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
.clear_flush_young = kvm_mmu_notifier_clear_flush_young,
+ .test_young = kvm_mmu_notifier_test_young,
.change_pte = kvm_mmu_notifier_change_pte,
.release = kvm_mmu_notifier_release,
};
static struct kvm *kvm_create_vm(void)
{
- int r = 0, i;
- struct kvm *kvm = kvm_arch_create_vm();
+ int r, i;
+ struct kvm *kvm = kvm_arch_alloc_vm();
- if (IS_ERR(kvm))
- goto out;
+ if (!kvm)
+ return ERR_PTR(-ENOMEM);
+
+ r = kvm_arch_init_vm(kvm);
+ if (r)
+ goto out_err_nodisable;
r = hardware_enable_all();
if (r)
r = -ENOMEM;
kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
if (!kvm->memslots)
- goto out_err;
+ goto out_err_nosrcu;
if (init_srcu_struct(&kvm->srcu))
- goto out_err;
+ goto out_err_nosrcu;
for (i = 0; i < KVM_NR_BUSES; i++) {
kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
GFP_KERNEL);
- if (!kvm->buses[i]) {
- cleanup_srcu_struct(&kvm->srcu);
+ if (!kvm->buses[i])
goto out_err;
- }
}
r = kvm_init_mmu_notifier(kvm);
- if (r) {
- cleanup_srcu_struct(&kvm->srcu);
+ if (r)
goto out_err;
- }
kvm->mm = current->mm;
atomic_inc(&kvm->mm->mm_count);
spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
spin_unlock(&kvm_lock);
-out:
+
return kvm;
out_err:
+ cleanup_srcu_struct(&kvm->srcu);
+out_err_nosrcu:
hardware_disable_all();
out_err_nodisable:
for (i = 0; i < KVM_NR_BUSES; i++)
kfree(kvm->buses[i]);
kfree(kvm->memslots);
- kfree(kvm);
+ kvm_arch_free_vm(kvm);
return ERR_PTR(r);
}
kvm_arch_flush_shadow(kvm);
#endif
kvm_arch_destroy_vm(kvm);
+ kvm_free_physmem(kvm);
+ cleanup_srcu_struct(&kvm->srcu);
+ kvm_arch_free_vm(kvm);
hardware_disable_all();
mmdrop(mm);
}
/* Allocate if a slot is being created */
#ifndef CONFIG_S390
if (npages && !new.rmap) {
- new.rmap = vmalloc(npages * sizeof(*new.rmap));
+ new.rmap = vzalloc(npages * sizeof(*new.rmap));
if (!new.rmap)
goto out_free;
- memset(new.rmap, 0, npages * sizeof(*new.rmap));
-
new.user_alloc = user_alloc;
new.userspace_addr = mem->userspace_addr;
}
>> KVM_HPAGE_GFN_SHIFT(level));
lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
- new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
+ new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
if (!new.lpage_info[i])
goto out_free;
- memset(new.lpage_info[i], 0,
- lpages * sizeof(*new.lpage_info[i]));
-
if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
new.lpage_info[i][0].write_count = 1;
if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
&kvm_chardev_ops,
};
-static void hardware_enable(void *junk)
+static void hardware_enable_nolock(void *junk)
{
int cpu = raw_smp_processor_id();
int r;
}
}
-static void hardware_disable(void *junk)
+static void hardware_enable(void *junk)
+{
+ spin_lock(&kvm_lock);
+ hardware_enable_nolock(junk);
+ spin_unlock(&kvm_lock);
+}
+
+static void hardware_disable_nolock(void *junk)
{
int cpu = raw_smp_processor_id();
kvm_arch_hardware_disable(NULL);
}
+static void hardware_disable(void *junk)
+{
+ spin_lock(&kvm_lock);
+ hardware_disable_nolock(junk);
+ spin_unlock(&kvm_lock);
+}
+
static void hardware_disable_all_nolock(void)
{
BUG_ON(!kvm_usage_count);
kvm_usage_count--;
if (!kvm_usage_count)
- on_each_cpu(hardware_disable, NULL, 1);
+ on_each_cpu(hardware_disable_nolock, NULL, 1);
}
static void hardware_disable_all(void)
kvm_usage_count++;
if (kvm_usage_count == 1) {
atomic_set(&hardware_enable_failed, 0);
- on_each_cpu(hardware_enable, NULL, 1);
+ on_each_cpu(hardware_enable_nolock, NULL, 1);
if (atomic_read(&hardware_enable_failed)) {
hardware_disable_all_nolock();
case CPU_STARTING:
printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
cpu);
- spin_lock(&kvm_lock);
hardware_enable(NULL);
- spin_unlock(&kvm_lock);
break;
}
return NOTIFY_OK;
}
-asmlinkage void kvm_handle_fault_on_reboot(void)
+asmlinkage void kvm_spurious_fault(void)
{
- if (kvm_rebooting) {
- /* spin while reset goes on */
- local_irq_enable();
- while (true)
- cpu_relax();
- }
/* Fault while not rebooting. We want the trace. */
BUG();
}
-EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
+EXPORT_SYMBOL_GPL(kvm_spurious_fault);
static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
void *v)
*/
printk(KERN_INFO "kvm: exiting hardware virtualization\n");
kvm_rebooting = true;
- on_each_cpu(hardware_disable, NULL, 1);
+ on_each_cpu(hardware_disable_nolock, NULL, 1);
return NOTIFY_OK;
}
static int kvm_suspend(struct sys_device *dev, pm_message_t state)
{
if (kvm_usage_count)
- hardware_disable(NULL);
+ hardware_disable_nolock(NULL);
return 0;
}
{
if (kvm_usage_count) {
WARN_ON(spin_is_locked(&kvm_lock));
- hardware_enable(NULL);
+ hardware_enable_nolock(NULL);
}
return 0;
}
sysdev_class_unregister(&kvm_sysdev_class);
unregister_reboot_notifier(&kvm_reboot_notifier);
unregister_cpu_notifier(&kvm_cpu_notifier);
- on_each_cpu(hardware_disable, NULL, 1);
+ on_each_cpu(hardware_disable_nolock, NULL, 1);
kvm_arch_hardware_unsetup();
kvm_arch_exit();
free_cpumask_var(cpus_hardware_enabled);
git.openpandora.org / pandora-kernel.git / blobdiff