#include <linux/module.h>
#include <linux/errno.h>
#include <linux/percpu.h>
-#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/mman.h>
#include <linux/swap.h>
+#include <linux/bitops.h>
+#include <linux/spinlock.h>
+#include <linux/compat.h>
+#include <linux/srcu.h>
+#include <linux/hugetlb.h>
+#include <linux/slab.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
+#include <asm-generic/bitops/le.h>
-#ifdef CONFIG_X86
-#include <asm/msidef.h>
-#endif
-
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
#include "coalesced_mmio.h"
-#endif
-#ifdef KVM_CAP_DEVICE_ASSIGNMENT
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-#include "irq.h"
-#endif
+#define CREATE_TRACE_POINTS
+#include <trace/events/kvm.h>
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
-static int msi2intx = 1;
-module_param(msi2intx, bool, 0);
+/*
+ * Ordering of locks:
+ *
+ * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
+ */
DEFINE_SPINLOCK(kvm_lock);
LIST_HEAD(vm_list);
static cpumask_var_t cpus_hardware_enabled;
+static int kvm_usage_count = 0;
+static atomic_t hardware_enable_failed;
struct kmem_cache *kvm_vcpu_cache;
EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
unsigned long arg);
+static int hardware_enable_all(void);
+static void hardware_disable_all(void);
-static bool kvm_rebooting;
-
-#ifdef KVM_CAP_DEVICE_ASSIGNMENT
-
-#ifdef CONFIG_X86
-static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev)
-{
- int vcpu_id;
- struct kvm_vcpu *vcpu;
- struct kvm_ioapic *ioapic = ioapic_irqchip(dev->kvm);
- int dest_id = (dev->guest_msi.address_lo & MSI_ADDR_DEST_ID_MASK)
- >> MSI_ADDR_DEST_ID_SHIFT;
- int vector = (dev->guest_msi.data & MSI_DATA_VECTOR_MASK)
- >> MSI_DATA_VECTOR_SHIFT;
- int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
- (unsigned long *)&dev->guest_msi.address_lo);
- int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
- (unsigned long *)&dev->guest_msi.data);
- int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
- (unsigned long *)&dev->guest_msi.data);
- u32 deliver_bitmask;
-
- BUG_ON(!ioapic);
-
- deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
- dest_id, dest_mode);
- /* IOAPIC delivery mode value is the same as MSI here */
- switch (delivery_mode) {
- case IOAPIC_LOWEST_PRIORITY:
- vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
- deliver_bitmask);
- if (vcpu != NULL)
- kvm_apic_set_irq(vcpu, vector, trig_mode);
- else
- printk(KERN_INFO "kvm: null lowest priority vcpu!\n");
- break;
- case IOAPIC_FIXED:
- for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
- if (!(deliver_bitmask & (1 << vcpu_id)))
- continue;
- deliver_bitmask &= ~(1 << vcpu_id);
- vcpu = ioapic->kvm->vcpus[vcpu_id];
- if (vcpu)
- kvm_apic_set_irq(vcpu, vector, trig_mode);
- }
- break;
- default:
- printk(KERN_INFO "kvm: unsupported MSI delivery mode\n");
- }
-}
-#else
-static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev) {}
-#endif
-
-static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
- int assigned_dev_id)
-{
- struct list_head *ptr;
- struct kvm_assigned_dev_kernel *match;
-
- list_for_each(ptr, head) {
- match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
- if (match->assigned_dev_id == assigned_dev_id)
- return match;
- }
- return NULL;
-}
-
-static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
-{
- struct kvm_assigned_dev_kernel *assigned_dev;
-
- assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
- interrupt_work);
-
- /* This is taken to safely inject irq inside the guest. When
- * the interrupt injection (or the ioapic code) uses a
- * finer-grained lock, update this
- */
- mutex_lock(&assigned_dev->kvm->lock);
- if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_GUEST_INTX)
- kvm_set_irq(assigned_dev->kvm,
- assigned_dev->irq_source_id,
- assigned_dev->guest_irq, 1);
- else if (assigned_dev->irq_requested_type &
- KVM_ASSIGNED_DEV_GUEST_MSI) {
- assigned_device_msi_dispatch(assigned_dev);
- enable_irq(assigned_dev->host_irq);
- assigned_dev->host_irq_disabled = false;
- }
- mutex_unlock(&assigned_dev->kvm->lock);
-}
-
-static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
-{
- struct kvm_assigned_dev_kernel *assigned_dev =
- (struct kvm_assigned_dev_kernel *) dev_id;
-
- schedule_work(&assigned_dev->interrupt_work);
-
- disable_irq_nosync(irq);
- assigned_dev->host_irq_disabled = true;
-
- return IRQ_HANDLED;
-}
-
-/* Ack the irq line for an assigned device */
-static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
-{
- struct kvm_assigned_dev_kernel *dev;
-
- if (kian->gsi == -1)
- return;
-
- dev = container_of(kian, struct kvm_assigned_dev_kernel,
- ack_notifier);
-
- kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
-
- /* The guest irq may be shared so this ack may be
- * from another device.
- */
- if (dev->host_irq_disabled) {
- enable_irq(dev->host_irq);
- dev->host_irq_disabled = false;
- }
-}
-
-/* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
-static void kvm_free_assigned_irq(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *assigned_dev)
-{
- if (!irqchip_in_kernel(kvm))
- return;
-
- kvm_unregister_irq_ack_notifier(&assigned_dev->ack_notifier);
-
- if (assigned_dev->irq_source_id != -1)
- kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
- assigned_dev->irq_source_id = -1;
-
- if (!assigned_dev->irq_requested_type)
- return;
-
- /*
- * In kvm_free_device_irq, cancel_work_sync return true if:
- * 1. work is scheduled, and then cancelled.
- * 2. work callback is executed.
- *
- * The first one ensured that the irq is disabled and no more events
- * would happen. But for the second one, the irq may be enabled (e.g.
- * for MSI). So we disable irq here to prevent further events.
- *
- * Notice this maybe result in nested disable if the interrupt type is
- * INTx, but it's OK for we are going to free it.
- *
- * If this function is a part of VM destroy, please ensure that till
- * now, the kvm state is still legal for probably we also have to wait
- * interrupt_work done.
- */
- disable_irq_nosync(assigned_dev->host_irq);
- cancel_work_sync(&assigned_dev->interrupt_work);
-
- free_irq(assigned_dev->host_irq, (void *)assigned_dev);
-
- if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
- pci_disable_msi(assigned_dev->dev);
-
- assigned_dev->irq_requested_type = 0;
-}
-
-
-static void kvm_free_assigned_device(struct kvm *kvm,
- struct kvm_assigned_dev_kernel
- *assigned_dev)
-{
- kvm_free_assigned_irq(kvm, assigned_dev);
-
- pci_reset_function(assigned_dev->dev);
-
- pci_release_regions(assigned_dev->dev);
- pci_disable_device(assigned_dev->dev);
- pci_dev_put(assigned_dev->dev);
-
- list_del(&assigned_dev->list);
- kfree(assigned_dev);
-}
-
-void kvm_free_all_assigned_devices(struct kvm *kvm)
-{
- struct list_head *ptr, *ptr2;
- struct kvm_assigned_dev_kernel *assigned_dev;
-
- list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
- assigned_dev = list_entry(ptr,
- struct kvm_assigned_dev_kernel,
- list);
-
- kvm_free_assigned_device(kvm, assigned_dev);
- }
-}
-
-static int assigned_device_update_intx(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *adev,
- struct kvm_assigned_irq *airq)
-{
- adev->guest_irq = airq->guest_irq;
- adev->ack_notifier.gsi = airq->guest_irq;
-
- if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_INTX)
- return 0;
-
- if (irqchip_in_kernel(kvm)) {
- if (!msi2intx &&
- adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) {
- free_irq(adev->host_irq, (void *)kvm);
- pci_disable_msi(adev->dev);
- }
-
- if (!capable(CAP_SYS_RAWIO))
- return -EPERM;
-
- if (airq->host_irq)
- adev->host_irq = airq->host_irq;
- else
- adev->host_irq = adev->dev->irq;
-
- /* Even though this is PCI, we don't want to use shared
- * interrupts. Sharing host devices with guest-assigned devices
- * on the same interrupt line is not a happy situation: there
- * are going to be long delays in accepting, acking, etc.
- */
- if (request_irq(adev->host_irq, kvm_assigned_dev_intr,
- 0, "kvm_assigned_intx_device", (void *)adev))
- return -EIO;
- }
-
- adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_INTX |
- KVM_ASSIGNED_DEV_HOST_INTX;
- return 0;
-}
-
-#ifdef CONFIG_X86
-static int assigned_device_update_msi(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *adev,
- struct kvm_assigned_irq *airq)
-{
- int r;
-
- if (airq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
- /* x86 don't care upper address of guest msi message addr */
- adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_MSI;
- adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_INTX;
- adev->guest_msi.address_lo = airq->guest_msi.addr_lo;
- adev->guest_msi.data = airq->guest_msi.data;
- adev->ack_notifier.gsi = -1;
- } else if (msi2intx) {
- adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_INTX;
- adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
- adev->guest_irq = airq->guest_irq;
- adev->ack_notifier.gsi = airq->guest_irq;
- }
-
- if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
- return 0;
-
- if (irqchip_in_kernel(kvm)) {
- if (!msi2intx) {
- if (adev->irq_requested_type &
- KVM_ASSIGNED_DEV_HOST_INTX)
- free_irq(adev->host_irq, (void *)adev);
-
- r = pci_enable_msi(adev->dev);
- if (r)
- return r;
- }
-
- adev->host_irq = adev->dev->irq;
- if (request_irq(adev->host_irq, kvm_assigned_dev_intr, 0,
- "kvm_assigned_msi_device", (void *)adev))
- return -EIO;
- }
-
- if (!msi2intx)
- adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI;
-
- adev->irq_requested_type |= KVM_ASSIGNED_DEV_HOST_MSI;
- return 0;
-}
-#endif
-
-static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
- struct kvm_assigned_irq
- *assigned_irq)
-{
- int r = 0;
- struct kvm_assigned_dev_kernel *match;
-
- mutex_lock(&kvm->lock);
-
- match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- assigned_irq->assigned_dev_id);
- if (!match) {
- mutex_unlock(&kvm->lock);
- return -EINVAL;
- }
-
- if (!match->irq_requested_type) {
- INIT_WORK(&match->interrupt_work,
- kvm_assigned_dev_interrupt_work_handler);
- if (irqchip_in_kernel(kvm)) {
- /* Register ack nofitier */
- match->ack_notifier.gsi = -1;
- match->ack_notifier.irq_acked =
- kvm_assigned_dev_ack_irq;
- kvm_register_irq_ack_notifier(kvm,
- &match->ack_notifier);
-
- /* Request IRQ source ID */
- r = kvm_request_irq_source_id(kvm);
- if (r < 0)
- goto out_release;
- else
- match->irq_source_id = r;
+static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
-#ifdef CONFIG_X86
- /* Determine host device irq type, we can know the
- * result from dev->msi_enabled */
- if (msi2intx)
- pci_enable_msi(match->dev);
-#endif
- }
- }
-
- if ((!msi2intx &&
- (assigned_irq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI)) ||
- (msi2intx && match->dev->msi_enabled)) {
-#ifdef CONFIG_X86
- r = assigned_device_update_msi(kvm, match, assigned_irq);
- if (r) {
- printk(KERN_WARNING "kvm: failed to enable "
- "MSI device!\n");
- goto out_release;
- }
-#else
- r = -ENOTTY;
-#endif
- } else if (assigned_irq->host_irq == 0 && match->dev->irq == 0) {
- /* Host device IRQ 0 means don't support INTx */
- if (!msi2intx) {
- printk(KERN_WARNING
- "kvm: wait device to enable MSI!\n");
- r = 0;
- } else {
- printk(KERN_WARNING
- "kvm: failed to enable MSI device!\n");
- r = -ENOTTY;
- goto out_release;
- }
- } else {
- /* Non-sharing INTx mode */
- r = assigned_device_update_intx(kvm, match, assigned_irq);
- if (r) {
- printk(KERN_WARNING "kvm: failed to enable "
- "INTx device!\n");
- goto out_release;
- }
- }
-
- mutex_unlock(&kvm->lock);
- return r;
-out_release:
- mutex_unlock(&kvm->lock);
- kvm_free_assigned_device(kvm, match);
- return r;
-}
-
-static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
- struct kvm_assigned_pci_dev *assigned_dev)
-{
- int r = 0;
- struct kvm_assigned_dev_kernel *match;
- struct pci_dev *dev;
-
- mutex_lock(&kvm->lock);
-
- match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- assigned_dev->assigned_dev_id);
- if (match) {
- /* device already assigned */
- r = -EINVAL;
- goto out;
- }
-
- match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
- if (match == NULL) {
- printk(KERN_INFO "%s: Couldn't allocate memory\n",
- __func__);
- r = -ENOMEM;
- goto out;
- }
- dev = pci_get_bus_and_slot(assigned_dev->busnr,
- assigned_dev->devfn);
- if (!dev) {
- printk(KERN_INFO "%s: host device not found\n", __func__);
- r = -EINVAL;
- goto out_free;
- }
- if (pci_enable_device(dev)) {
- printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
- r = -EBUSY;
- goto out_put;
- }
- r = pci_request_regions(dev, "kvm_assigned_device");
- if (r) {
- printk(KERN_INFO "%s: Could not get access to device regions\n",
- __func__);
- goto out_disable;
- }
-
- pci_reset_function(dev);
-
- match->assigned_dev_id = assigned_dev->assigned_dev_id;
- match->host_busnr = assigned_dev->busnr;
- match->host_devfn = assigned_dev->devfn;
- match->flags = assigned_dev->flags;
- match->dev = dev;
- match->irq_source_id = -1;
- match->kvm = kvm;
-
- list_add(&match->list, &kvm->arch.assigned_dev_head);
-
- if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
- if (!kvm->arch.iommu_domain) {
- r = kvm_iommu_map_guest(kvm);
- if (r)
- goto out_list_del;
- }
- r = kvm_assign_device(kvm, match);
- if (r)
- goto out_list_del;
- }
-
-out:
- mutex_unlock(&kvm->lock);
- return r;
-out_list_del:
- list_del(&match->list);
- pci_release_regions(dev);
-out_disable:
- pci_disable_device(dev);
-out_put:
- pci_dev_put(dev);
-out_free:
- kfree(match);
- mutex_unlock(&kvm->lock);
- return r;
-}
-#endif
-
-#ifdef KVM_CAP_DEVICE_DEASSIGNMENT
-static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
- struct kvm_assigned_pci_dev *assigned_dev)
-{
- int r = 0;
- struct kvm_assigned_dev_kernel *match;
-
- mutex_lock(&kvm->lock);
-
- match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- assigned_dev->assigned_dev_id);
- if (!match) {
- printk(KERN_INFO "%s: device hasn't been assigned before, "
- "so cannot be deassigned\n", __func__);
- r = -EINVAL;
- goto out;
- }
-
- if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
- kvm_deassign_device(kvm, match);
-
- kvm_free_assigned_device(kvm, match);
-
-out:
- mutex_unlock(&kvm->lock);
- return r;
-}
-#endif
+static bool kvm_rebooting;
-static inline int valid_vcpu(int n)
-{
- return likely(n >= 0 && n < KVM_MAX_VCPUS);
-}
+static bool largepages_enabled = true;
inline int kvm_is_mmio_pfn(pfn_t pfn)
{
- if (pfn_valid(pfn))
- return PageReserved(pfn_to_page(pfn));
+ if (pfn_valid(pfn)) {
+ struct page *page = compound_head(pfn_to_page(pfn));
+ return PageReserved(page);
+ }
return true;
}
bool called = true;
struct kvm_vcpu *vcpu;
- if (alloc_cpumask_var(&cpus, GFP_ATOMIC))
- cpumask_clear(cpus);
+ zalloc_cpumask_var(&cpus, GFP_ATOMIC);
- me = get_cpu();
- for (i = 0; i < KVM_MAX_VCPUS; ++i) {
- vcpu = kvm->vcpus[i];
- if (!vcpu)
- continue;
+ raw_spin_lock(&kvm->requests_lock);
+ me = smp_processor_id();
+ kvm_for_each_vcpu(i, vcpu, kvm) {
if (test_and_set_bit(req, &vcpu->requests))
continue;
cpu = vcpu->cpu;
smp_call_function_many(cpus, ack_flush, NULL, 1);
else
called = false;
- put_cpu();
+ raw_spin_unlock(&kvm->requests_lock);
free_cpumask_var(cpus);
return called;
}
unsigned long address)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- int need_tlb_flush;
+ int need_tlb_flush, idx;
/*
* When ->invalidate_page runs, the linux pte has been zapped
* pte after kvm_unmap_hva returned, without noticing the page
* is going to be freed.
*/
+ idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
kvm->mmu_notifier_seq++;
need_tlb_flush = kvm_unmap_hva(kvm, address);
spin_unlock(&kvm->mmu_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
/* we've to flush the tlb before the pages can be freed */
if (need_tlb_flush)
}
+static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long address,
+ pte_t pte)
+{
+ struct kvm *kvm = mmu_notifier_to_kvm(mn);
+ int idx;
+
+ idx = srcu_read_lock(&kvm->srcu);
+ spin_lock(&kvm->mmu_lock);
+ kvm->mmu_notifier_seq++;
+ kvm_set_spte_hva(kvm, address, pte);
+ spin_unlock(&kvm->mmu_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
+}
+
static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start,
unsigned long end)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- int need_tlb_flush = 0;
+ int need_tlb_flush = 0, idx;
+ idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
/*
* The count increase must become visible at unlock time as no
for (; start < end; start += PAGE_SIZE)
need_tlb_flush |= kvm_unmap_hva(kvm, start);
spin_unlock(&kvm->mmu_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
/* we've to flush the tlb before the pages can be freed */
if (need_tlb_flush)
unsigned long address)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- int young;
+ int young, idx;
+ idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
young = kvm_age_hva(kvm, address);
spin_unlock(&kvm->mmu_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
if (young)
kvm_flush_remote_tlbs(kvm);
struct mm_struct *mm)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
+ int idx;
+
+ idx = srcu_read_lock(&kvm->srcu);
kvm_arch_flush_shadow(kvm);
+ srcu_read_unlock(&kvm->srcu, idx);
}
static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
.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,
+ .change_pte = kvm_mmu_notifier_change_pte,
.release = kvm_mmu_notifier_release,
};
+
+static int kvm_init_mmu_notifier(struct kvm *kvm)
+{
+ kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
+ return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
+}
+
+#else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
+
+static int kvm_init_mmu_notifier(struct kvm *kvm)
+{
+ return 0;
+}
+
#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
static struct kvm *kvm_create_vm(void)
{
+ int r = 0, i;
struct kvm *kvm = kvm_arch_create_vm();
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
- struct page *page;
-#endif
if (IS_ERR(kvm))
goto out;
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
- page = alloc_page(GFP_KERNEL | __GFP_ZERO);
- if (!page) {
- kfree(kvm);
- return ERR_PTR(-ENOMEM);
- }
- kvm->coalesced_mmio_ring =
- (struct kvm_coalesced_mmio_ring *)page_address(page);
-#endif
+ r = hardware_enable_all();
+ if (r)
+ goto out_err_nodisable;
-#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
- {
- int err;
- kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
- err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
- if (err) {
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
- put_page(page);
+#ifdef CONFIG_HAVE_KVM_IRQCHIP
+ INIT_HLIST_HEAD(&kvm->mask_notifier_list);
+ INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
#endif
- kfree(kvm);
- return ERR_PTR(err);
+
+ r = -ENOMEM;
+ kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
+ if (!kvm->memslots)
+ goto out_err;
+ if (init_srcu_struct(&kvm->srcu))
+ goto out_err;
+ 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);
+ goto out_err;
}
}
-#endif
+
+ r = kvm_init_mmu_notifier(kvm);
+ if (r) {
+ cleanup_srcu_struct(&kvm->srcu);
+ goto out_err;
+ }
kvm->mm = current->mm;
atomic_inc(&kvm->mm->mm_count);
spin_lock_init(&kvm->mmu_lock);
- kvm_io_bus_init(&kvm->pio_bus);
+ raw_spin_lock_init(&kvm->requests_lock);
+ kvm_eventfd_init(kvm);
mutex_init(&kvm->lock);
- kvm_io_bus_init(&kvm->mmio_bus);
- init_rwsem(&kvm->slots_lock);
+ mutex_init(&kvm->irq_lock);
+ mutex_init(&kvm->slots_lock);
atomic_set(&kvm->users_count, 1);
spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
#endif
out:
return kvm;
+
+out_err:
+ hardware_disable_all();
+out_err_nodisable:
+ for (i = 0; i < KVM_NR_BUSES; i++)
+ kfree(kvm->buses[i]);
+ kfree(kvm->memslots);
+ kfree(kvm);
+ return ERR_PTR(r);
}
/*
static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
+ int i;
+
if (!dont || free->rmap != dont->rmap)
vfree(free->rmap);
if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
vfree(free->dirty_bitmap);
- if (!dont || free->lpage_info != dont->lpage_info)
- vfree(free->lpage_info);
+
+ for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
+ if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
+ vfree(free->lpage_info[i]);
+ free->lpage_info[i] = NULL;
+ }
+ }
free->npages = 0;
free->dirty_bitmap = NULL;
free->rmap = NULL;
- free->lpage_info = NULL;
}
void kvm_free_physmem(struct kvm *kvm)
{
int i;
+ struct kvm_memslots *slots = kvm->memslots;
- for (i = 0; i < kvm->nmemslots; ++i)
- kvm_free_physmem_slot(&kvm->memslots[i], NULL);
+ for (i = 0; i < slots->nmemslots; ++i)
+ kvm_free_physmem_slot(&slots->memslots[i], NULL);
+
+ kfree(kvm->memslots);
}
static void kvm_destroy_vm(struct kvm *kvm)
{
+ int i;
struct mm_struct *mm = kvm->mm;
kvm_arch_sync_events(kvm);
spin_lock(&kvm_lock);
list_del(&kvm->vm_list);
spin_unlock(&kvm_lock);
- kvm_io_bus_destroy(&kvm->pio_bus);
- kvm_io_bus_destroy(&kvm->mmio_bus);
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
- if (kvm->coalesced_mmio_ring != NULL)
- free_page((unsigned long)kvm->coalesced_mmio_ring);
-#endif
+ kvm_free_irq_routing(kvm);
+ for (i = 0; i < KVM_NR_BUSES; i++)
+ kvm_io_bus_destroy(kvm->buses[i]);
+ kvm_coalesced_mmio_free(kvm);
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
+#else
+ kvm_arch_flush_shadow(kvm);
#endif
kvm_arch_destroy_vm(kvm);
+ hardware_disable_all();
mmdrop(mm);
}
{
struct kvm *kvm = filp->private_data;
+ kvm_irqfd_release(kvm);
+
kvm_put_kvm(kvm);
return 0;
}
struct kvm_userspace_memory_region *mem,
int user_alloc)
{
- int r;
+ int r, flush_shadow = 0;
gfn_t base_gfn;
unsigned long npages;
unsigned long i;
struct kvm_memory_slot *memslot;
struct kvm_memory_slot old, new;
+ struct kvm_memslots *slots, *old_memslots;
r = -EINVAL;
/* General sanity checks */
if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
goto out;
- memslot = &kvm->memslots[mem->slot];
+ memslot = &kvm->memslots->memslots[mem->slot];
base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
npages = mem->memory_size >> PAGE_SHIFT;
/* Check for overlaps */
r = -EEXIST;
for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
- struct kvm_memory_slot *s = &kvm->memslots[i];
+ struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
- if (s == memslot)
+ if (s == memslot || !s->npages)
continue;
if (!((base_gfn + npages <= s->base_gfn) ||
(base_gfn >= s->base_gfn + s->npages)))
memset(new.rmap, 0, npages * sizeof(*new.rmap));
new.user_alloc = user_alloc;
- /*
- * hva_to_rmmap() serialzies with the mmu_lock and to be
- * safe it has to ignore memslots with !user_alloc &&
- * !userspace_addr.
- */
- if (user_alloc)
- new.userspace_addr = mem->userspace_addr;
- else
- new.userspace_addr = 0;
+ new.userspace_addr = mem->userspace_addr;
}
- if (npages && !new.lpage_info) {
- int largepages = npages / KVM_PAGES_PER_HPAGE;
- if (npages % KVM_PAGES_PER_HPAGE)
- largepages++;
- if (base_gfn % KVM_PAGES_PER_HPAGE)
- largepages++;
+ if (!npages)
+ goto skip_lpage;
+
+ for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
+ unsigned long ugfn;
+ unsigned long j;
+ int lpages;
+ int level = i + 2;
- new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
+ /* Avoid unused variable warning if no large pages */
+ (void)level;
- if (!new.lpage_info)
+ if (new.lpage_info[i])
+ continue;
+
+ lpages = 1 + (base_gfn + npages - 1) /
+ KVM_PAGES_PER_HPAGE(level);
+ lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
+
+ new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
+
+ if (!new.lpage_info[i])
goto out_free;
- memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
+ memset(new.lpage_info[i], 0,
+ lpages * sizeof(*new.lpage_info[i]));
- if (base_gfn % KVM_PAGES_PER_HPAGE)
- new.lpage_info[0].write_count = 1;
- if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
- new.lpage_info[largepages-1].write_count = 1;
+ if (base_gfn % KVM_PAGES_PER_HPAGE(level))
+ new.lpage_info[i][0].write_count = 1;
+ if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
+ new.lpage_info[i][lpages - 1].write_count = 1;
+ ugfn = new.userspace_addr >> PAGE_SHIFT;
+ /*
+ * If the gfn and userspace address are not aligned wrt each
+ * other, or if explicitly asked to, disable large page
+ * support for this slot
+ */
+ if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
+ !largepages_enabled)
+ for (j = 0; j < lpages; ++j)
+ new.lpage_info[i][j].write_count = 1;
}
+skip_lpage:
+
/* Allocate page dirty bitmap if needed */
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
- unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
+ unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
new.dirty_bitmap = vmalloc(dirty_bytes);
if (!new.dirty_bitmap)
goto out_free;
memset(new.dirty_bitmap, 0, dirty_bytes);
- }
+ /* destroy any largepage mappings for dirty tracking */
+ if (old.npages)
+ flush_shadow = 1;
+ }
+#else /* not defined CONFIG_S390 */
+ new.user_alloc = user_alloc;
+ if (user_alloc)
+ new.userspace_addr = mem->userspace_addr;
#endif /* not defined CONFIG_S390 */
- if (!npages)
+ if (!npages) {
+ r = -ENOMEM;
+ slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
+ if (!slots)
+ goto out_free;
+ memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
+ if (mem->slot >= slots->nmemslots)
+ slots->nmemslots = mem->slot + 1;
+ slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
+
+ old_memslots = kvm->memslots;
+ rcu_assign_pointer(kvm->memslots, slots);
+ synchronize_srcu_expedited(&kvm->srcu);
+ /* From this point no new shadow pages pointing to a deleted
+ * memslot will be created.
+ *
+ * validation of sp->gfn happens in:
+ * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
+ * - kvm_is_visible_gfn (mmu_check_roots)
+ */
kvm_arch_flush_shadow(kvm);
+ kfree(old_memslots);
+ }
- spin_lock(&kvm->mmu_lock);
- if (mem->slot >= kvm->nmemslots)
- kvm->nmemslots = mem->slot + 1;
-
- *memslot = new;
- spin_unlock(&kvm->mmu_lock);
-
- r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
- if (r) {
- spin_lock(&kvm->mmu_lock);
- *memslot = old;
- spin_unlock(&kvm->mmu_lock);
+ r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
+ if (r)
goto out_free;
- }
- kvm_free_physmem_slot(&old, npages ? &new : NULL);
- /* Slot deletion case: we have to update the current slot */
- if (!npages)
- *memslot = old;
#ifdef CONFIG_DMAR
/* map the pages in iommu page table */
- r = kvm_iommu_map_pages(kvm, base_gfn, npages);
- if (r)
- goto out;
+ if (npages) {
+ r = kvm_iommu_map_pages(kvm, &new);
+ if (r)
+ goto out_free;
+ }
#endif
+
+ r = -ENOMEM;
+ slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
+ if (!slots)
+ goto out_free;
+ memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
+ if (mem->slot >= slots->nmemslots)
+ slots->nmemslots = mem->slot + 1;
+
+ /* actual memory is freed via old in kvm_free_physmem_slot below */
+ if (!npages) {
+ new.rmap = NULL;
+ new.dirty_bitmap = NULL;
+ for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
+ new.lpage_info[i] = NULL;
+ }
+
+ slots->memslots[mem->slot] = new;
+ old_memslots = kvm->memslots;
+ rcu_assign_pointer(kvm->memslots, slots);
+ synchronize_srcu_expedited(&kvm->srcu);
+
+ kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
+
+ kvm_free_physmem_slot(&old, &new);
+ kfree(old_memslots);
+
+ if (flush_shadow)
+ kvm_arch_flush_shadow(kvm);
+
return 0;
out_free:
{
int r;
- down_write(&kvm->slots_lock);
+ mutex_lock(&kvm->slots_lock);
r = __kvm_set_memory_region(kvm, mem, user_alloc);
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return r;
}
EXPORT_SYMBOL_GPL(kvm_set_memory_region);
{
struct kvm_memory_slot *memslot;
int r, i;
- int n;
+ unsigned long n;
unsigned long any = 0;
r = -EINVAL;
if (log->slot >= KVM_MEMORY_SLOTS)
goto out;
- memslot = &kvm->memslots[log->slot];
+ memslot = &kvm->memslots->memslots[log->slot];
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;
- n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+ n = kvm_dirty_bitmap_bytes(memslot);
for (i = 0; !any && i < n/sizeof(long); ++i)
any = memslot->dirty_bitmap[i];
return r;
}
+void kvm_disable_largepages(void)
+{
+ largepages_enabled = false;
+}
+EXPORT_SYMBOL_GPL(kvm_disable_largepages);
+
int is_error_page(struct page *page)
{
return page == bad_page;
struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
{
int i;
+ struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
- for (i = 0; i < kvm->nmemslots; ++i) {
- struct kvm_memory_slot *memslot = &kvm->memslots[i];
+ for (i = 0; i < slots->nmemslots; ++i) {
+ struct kvm_memory_slot *memslot = &slots->memslots[i];
if (gfn >= memslot->base_gfn
&& gfn < memslot->base_gfn + memslot->npages)
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
{
int i;
+ struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
- gfn = unalias_gfn(kvm, gfn);
+ gfn = unalias_gfn_instantiation(kvm, gfn);
for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
- struct kvm_memory_slot *memslot = &kvm->memslots[i];
+ struct kvm_memory_slot *memslot = &slots->memslots[i];
+
+ if (memslot->flags & KVM_MEMSLOT_INVALID)
+ continue;
if (gfn >= memslot->base_gfn
&& gfn < memslot->base_gfn + memslot->npages)
}
EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
+unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
+{
+ struct vm_area_struct *vma;
+ unsigned long addr, size;
+
+ size = PAGE_SIZE;
+
+ addr = gfn_to_hva(kvm, gfn);
+ if (kvm_is_error_hva(addr))
+ return PAGE_SIZE;
+
+ down_read(¤t->mm->mmap_sem);
+ vma = find_vma(current->mm, addr);
+ if (!vma)
+ goto out;
+
+ size = vma_kernel_pagesize(vma);
+
+out:
+ up_read(¤t->mm->mmap_sem);
+
+ return size;
+}
+
+int memslot_id(struct kvm *kvm, gfn_t gfn)
+{
+ int i;
+ struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
+ struct kvm_memory_slot *memslot = NULL;
+
+ gfn = unalias_gfn(kvm, gfn);
+ for (i = 0; i < slots->nmemslots; ++i) {
+ memslot = &slots->memslots[i];
+
+ if (gfn >= memslot->base_gfn
+ && gfn < memslot->base_gfn + memslot->npages)
+ break;
+ }
+
+ 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;
- gfn = unalias_gfn(kvm, gfn);
+ gfn = unalias_gfn_instantiation(kvm, gfn);
slot = gfn_to_memslot_unaliased(kvm, gfn);
- if (!slot)
+ 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);
-pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
+static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
{
struct page *page[1];
- unsigned long addr;
int npages;
pfn_t pfn;
might_sleep();
- addr = gfn_to_hva(kvm, gfn);
- if (kvm_is_error_hva(addr)) {
- get_page(bad_page);
- return page_to_pfn(bad_page);
- }
-
npages = get_user_pages_fast(addr, 1, 1, page);
if (unlikely(npages != 1)) {
return pfn;
}
+pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
+{
+ unsigned long addr;
+
+ addr = gfn_to_hva(kvm, gfn);
+ if (kvm_is_error_hva(addr)) {
+ get_page(bad_page);
+ return page_to_pfn(bad_page);
+ }
+
+ return hva_to_pfn(kvm, addr);
+}
EXPORT_SYMBOL_GPL(gfn_to_pfn);
+pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
+ struct kvm_memory_slot *slot, gfn_t gfn)
+{
+ unsigned long addr = gfn_to_hva_memslot(slot, gfn);
+ return hva_to_pfn(kvm, addr);
+}
+
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
pfn_t pfn;
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 (!test_bit(rel_gfn, memslot->dirty_bitmap))
- set_bit(rel_gfn, memslot->dirty_bitmap);
+ if (!generic_test_le_bit(offset, p))
+ generic___set_le_bit(offset, p);
}
}
for (;;) {
prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
- if (kvm_cpu_has_interrupt(vcpu) ||
- kvm_cpu_has_pending_timer(vcpu) ||
- kvm_arch_vcpu_runnable(vcpu)) {
+ if (kvm_arch_vcpu_runnable(vcpu)) {
set_bit(KVM_REQ_UNHALT, &vcpu->requests);
break;
}
+ if (kvm_cpu_has_pending_timer(vcpu))
+ break;
if (signal_pending(current))
break;
- vcpu_put(vcpu);
schedule();
- vcpu_load(vcpu);
}
finish_wait(&vcpu->wq, &wait);
}
EXPORT_SYMBOL_GPL(kvm_resched);
+void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
+{
+ ktime_t expires;
+ DEFINE_WAIT(wait);
+
+ prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
+
+ /* Sleep for 100 us, and hope lock-holder got scheduled */
+ expires = ktime_add_ns(ktime_get(), 100000UL);
+ schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
+
+ finish_wait(&vcpu->wq, &wait);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
+
static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvm_vcpu *vcpu = vma->vm_file->private_data;
return 0;
}
-static struct vm_operations_struct kvm_vcpu_vm_ops = {
+static const struct vm_operations_struct kvm_vcpu_vm_ops = {
.fault = kvm_vcpu_fault,
};
*/
static int create_vcpu_fd(struct kvm_vcpu *vcpu)
{
- int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
- if (fd < 0)
- kvm_put_kvm(vcpu->kvm);
- return fd;
+ return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
}
/*
* Creates some virtual cpus. Good luck creating more than one.
*/
-static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
+static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
{
int r;
- struct kvm_vcpu *vcpu;
+ struct kvm_vcpu *vcpu, *v;
- if (!valid_vcpu(n))
- return -EINVAL;
-
- vcpu = kvm_arch_vcpu_create(kvm, n);
+ vcpu = kvm_arch_vcpu_create(kvm, id);
if (IS_ERR(vcpu))
return PTR_ERR(vcpu);
return r;
mutex_lock(&kvm->lock);
- if (kvm->vcpus[n]) {
- r = -EEXIST;
+ if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
+ r = -EINVAL;
goto vcpu_destroy;
}
- kvm->vcpus[n] = vcpu;
- mutex_unlock(&kvm->lock);
+
+ kvm_for_each_vcpu(r, v, kvm)
+ if (v->vcpu_id == id) {
+ r = -EEXIST;
+ goto vcpu_destroy;
+ }
+
+ BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
/* Now it's all set up, let userspace reach it */
kvm_get_kvm(kvm);
r = create_vcpu_fd(vcpu);
- if (r < 0)
- goto unlink;
+ if (r < 0) {
+ kvm_put_kvm(kvm);
+ goto vcpu_destroy;
+ }
+
+ kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
+ smp_wmb();
+ atomic_inc(&kvm->online_vcpus);
+
+#ifdef CONFIG_KVM_APIC_ARCHITECTURE
+ if (kvm->bsp_vcpu_id == id)
+ kvm->bsp_vcpu = vcpu;
+#endif
+ mutex_unlock(&kvm->lock);
return r;
-unlink:
- mutex_lock(&kvm->lock);
- kvm->vcpus[n] = NULL;
vcpu_destroy:
mutex_unlock(&kvm->lock);
kvm_arch_vcpu_destroy(vcpu);
r = 0;
break;
}
- case KVM_DEBUG_GUEST: {
- struct kvm_debug_guest dbg;
+ case KVM_SET_GUEST_DEBUG: {
+ struct kvm_guest_debug dbg;
r = -EFAULT;
if (copy_from_user(&dbg, argp, sizeof dbg))
goto out;
- r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
+ r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
if (r)
goto out;
r = 0;
break;
}
#endif
-#ifdef KVM_CAP_DEVICE_ASSIGNMENT
- case KVM_ASSIGN_PCI_DEVICE: {
- struct kvm_assigned_pci_dev assigned_dev;
+ case KVM_IRQFD: {
+ struct kvm_irqfd data;
r = -EFAULT;
- if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
- goto out;
- r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
- if (r)
+ if (copy_from_user(&data, argp, sizeof data))
goto out;
+ r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
break;
}
- case KVM_ASSIGN_IRQ: {
- struct kvm_assigned_irq assigned_irq;
+ case KVM_IOEVENTFD: {
+ struct kvm_ioeventfd data;
r = -EFAULT;
- if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
- goto out;
- r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
- if (r)
+ if (copy_from_user(&data, argp, sizeof data))
goto out;
+ r = kvm_ioeventfd(kvm, &data);
break;
}
+#ifdef CONFIG_KVM_APIC_ARCHITECTURE
+ case KVM_SET_BOOT_CPU_ID:
+ r = 0;
+ mutex_lock(&kvm->lock);
+ if (atomic_read(&kvm->online_vcpus) != 0)
+ r = -EBUSY;
+ else
+ kvm->bsp_vcpu_id = arg;
+ mutex_unlock(&kvm->lock);
+ break;
#endif
-#ifdef KVM_CAP_DEVICE_DEASSIGNMENT
- case KVM_DEASSIGN_PCI_DEVICE: {
- struct kvm_assigned_pci_dev assigned_dev;
+ default:
+ r = kvm_arch_vm_ioctl(filp, ioctl, arg);
+ if (r == -ENOTTY)
+ r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
+ }
+out:
+ return r;
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_kvm_dirty_log {
+ __u32 slot;
+ __u32 padding1;
+ union {
+ compat_uptr_t dirty_bitmap; /* one bit per page */
+ __u64 padding2;
+ };
+};
+
+static long kvm_vm_compat_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm *kvm = filp->private_data;
+ int r;
+
+ if (kvm->mm != current->mm)
+ return -EIO;
+ switch (ioctl) {
+ case KVM_GET_DIRTY_LOG: {
+ struct compat_kvm_dirty_log compat_log;
+ struct kvm_dirty_log log;
r = -EFAULT;
- if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
+ if (copy_from_user(&compat_log, (void __user *)arg,
+ sizeof(compat_log)))
goto out;
- r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
+ log.slot = compat_log.slot;
+ log.padding1 = compat_log.padding1;
+ log.padding2 = compat_log.padding2;
+ log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
+
+ r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
if (r)
goto out;
break;
}
-#endif
default:
- r = kvm_arch_vm_ioctl(filp, ioctl, arg);
+ r = kvm_vm_ioctl(filp, ioctl, arg);
}
+
out:
return r;
}
+#endif
static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
return 0;
}
-static struct vm_operations_struct kvm_vm_vm_ops = {
+static const struct vm_operations_struct kvm_vm_vm_ops = {
.fault = kvm_vm_fault,
};
static struct file_operations kvm_vm_fops = {
.release = kvm_vm_release,
.unlocked_ioctl = kvm_vm_ioctl,
- .compat_ioctl = kvm_vm_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = kvm_vm_compat_ioctl,
+#endif
.mmap = kvm_vm_mmap,
};
kvm = kvm_create_vm();
if (IS_ERR(kvm))
return PTR_ERR(kvm);
- fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
+ fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
if (fd < 0)
kvm_put_kvm(kvm);
switch (arg) {
case KVM_CAP_USER_MEMORY:
case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
+ case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
+#ifdef CONFIG_KVM_APIC_ARCHITECTURE
+ case KVM_CAP_SET_BOOT_CPU_ID:
+#endif
+ case KVM_CAP_INTERNAL_ERROR_DATA:
return 1;
+#ifdef CONFIG_HAVE_KVM_IRQCHIP
+ case KVM_CAP_IRQ_ROUTING:
+ return KVM_MAX_IRQ_ROUTES;
+#endif
default:
break;
}
case KVM_TRACE_ENABLE:
case KVM_TRACE_PAUSE:
case KVM_TRACE_DISABLE:
- r = kvm_trace_ioctl(ioctl, arg);
+ r = -EOPNOTSUPP;
break;
default:
return kvm_arch_dev_ioctl(filp, ioctl, arg);
static void hardware_enable(void *junk)
{
int cpu = raw_smp_processor_id();
+ int r;
if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
return;
+
cpumask_set_cpu(cpu, cpus_hardware_enabled);
- kvm_arch_hardware_enable(NULL);
+
+ r = kvm_arch_hardware_enable(NULL);
+
+ if (r) {
+ cpumask_clear_cpu(cpu, cpus_hardware_enabled);
+ atomic_inc(&hardware_enable_failed);
+ printk(KERN_INFO "kvm: enabling virtualization on "
+ "CPU%d failed\n", cpu);
+ }
}
static void hardware_disable(void *junk)
kvm_arch_hardware_disable(NULL);
}
+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);
+}
+
+static void hardware_disable_all(void)
+{
+ spin_lock(&kvm_lock);
+ hardware_disable_all_nolock();
+ spin_unlock(&kvm_lock);
+}
+
+static int hardware_enable_all(void)
+{
+ int r = 0;
+
+ spin_lock(&kvm_lock);
+
+ kvm_usage_count++;
+ if (kvm_usage_count == 1) {
+ atomic_set(&hardware_enable_failed, 0);
+ on_each_cpu(hardware_enable, NULL, 1);
+
+ if (atomic_read(&hardware_enable_failed)) {
+ hardware_disable_all_nolock();
+ r = -EBUSY;
+ }
+ }
+
+ spin_unlock(&kvm_lock);
+
+ return r;
+}
+
static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
void *v)
{
int cpu = (long)v;
+ if (!kvm_usage_count)
+ return NOTIFY_OK;
+
val &= ~CPU_TASKS_FROZEN;
switch (val) {
case CPU_DYING:
static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
void *v)
{
- if (val == SYS_RESTART) {
- /*
- * Some (well, at least mine) BIOSes hang on reboot if
- * in vmx root mode.
- */
- printk(KERN_INFO "kvm: exiting hardware virtualization\n");
- kvm_rebooting = true;
- on_each_cpu(hardware_disable, NULL, 1);
- }
+ /*
+ * Some (well, at least mine) BIOSes hang on reboot if
+ * in vmx root mode.
+ *
+ * And Intel TXT required VMX off for all cpu when system shutdown.
+ */
+ printk(KERN_INFO "kvm: exiting hardware virtualization\n");
+ kvm_rebooting = true;
+ on_each_cpu(hardware_disable, NULL, 1);
return NOTIFY_OK;
}
.priority = 0,
};
-void kvm_io_bus_init(struct kvm_io_bus *bus)
-{
- memset(bus, 0, sizeof(*bus));
-}
-
-void kvm_io_bus_destroy(struct kvm_io_bus *bus)
+static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
{
int i;
kvm_iodevice_destructor(pos);
}
+ kfree(bus);
}
-struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
- gpa_t addr, int len, int is_write)
+/* kvm_io_bus_write - called under kvm->slots_lock */
+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]);
+ for (i = 0; i < bus->dev_count; i++)
+ if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
+ return 0;
+ return -EOPNOTSUPP;
+}
- for (i = 0; i < bus->dev_count; i++) {
- struct kvm_io_device *pos = bus->devs[i];
+/* kvm_io_bus_read - called under kvm->slots_lock */
+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]);
- if (pos->in_range(pos, addr, len, is_write))
- return pos;
- }
+ for (i = 0; i < bus->dev_count; i++)
+ if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
+ return 0;
+ return -EOPNOTSUPP;
+}
- return NULL;
+/* Caller must hold slots_lock. */
+int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
+ struct kvm_io_device *dev)
+{
+ struct kvm_io_bus *new_bus, *bus;
+
+ bus = kvm->buses[bus_idx];
+ if (bus->dev_count > NR_IOBUS_DEVS-1)
+ return -ENOSPC;
+
+ new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
+ if (!new_bus)
+ return -ENOMEM;
+ memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
+ new_bus->devs[new_bus->dev_count++] = dev;
+ rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
+ synchronize_srcu_expedited(&kvm->srcu);
+ kfree(bus);
+
+ return 0;
}
-void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
+/* Caller must hold slots_lock. */
+int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
+ struct kvm_io_device *dev)
{
- BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
+ int i, r;
+ struct kvm_io_bus *new_bus, *bus;
+
+ new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
+ if (!new_bus)
+ return -ENOMEM;
+
+ bus = kvm->buses[bus_idx];
+ memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
+
+ r = -ENOENT;
+ for (i = 0; i < new_bus->dev_count; i++)
+ if (new_bus->devs[i] == dev) {
+ r = 0;
+ new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
+ break;
+ }
+
+ if (r) {
+ kfree(new_bus);
+ return r;
+ }
- bus->devs[bus->dev_count++] = dev;
+ rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
+ synchronize_srcu_expedited(&kvm->srcu);
+ kfree(bus);
+ return r;
}
static struct notifier_block kvm_cpu_notifier = {
*val = 0;
spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
- for (i = 0; i < KVM_MAX_VCPUS; ++i) {
- vcpu = kvm->vcpus[i];
- if (vcpu)
- *val += *(u32 *)((void *)vcpu + offset);
- }
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ *val += *(u32 *)((void *)vcpu + offset);
+
spin_unlock(&kvm_lock);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
-static struct file_operations *stat_fops[] = {
+static const struct file_operations *stat_fops[] = {
[KVM_STAT_VCPU] = &vcpu_stat_fops,
[KVM_STAT_VM] = &vm_stat_fops,
};
static int kvm_suspend(struct sys_device *dev, pm_message_t state)
{
- hardware_disable(NULL);
+ if (kvm_usage_count)
+ hardware_disable(NULL);
return 0;
}
static int kvm_resume(struct sys_device *dev)
{
- hardware_enable(NULL);
+ if (kvm_usage_count)
+ hardware_enable(NULL);
return 0;
}
int r;
int cpu;
- kvm_init_debug();
-
r = kvm_arch_init(opaque);
if (r)
goto out_fail;
bad_pfn = page_to_pfn(bad_page);
- if (!alloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
+ if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
r = -ENOMEM;
goto out_free_0;
}
goto out_free_1;
}
- on_each_cpu(hardware_enable, NULL, 1);
r = register_cpu_notifier(&kvm_cpu_notifier);
if (r)
goto out_free_2;
kvm_preempt_ops.sched_in = kvm_sched_in;
kvm_preempt_ops.sched_out = kvm_sched_out;
-#ifndef CONFIG_X86
- msi2intx = 0;
-#endif
+
+ kvm_init_debug();
return 0;
unregister_reboot_notifier(&kvm_reboot_notifier);
unregister_cpu_notifier(&kvm_cpu_notifier);
out_free_2:
- on_each_cpu(hardware_disable, NULL, 1);
out_free_1:
kvm_arch_hardware_unsetup();
out_free_0a:
__free_page(bad_page);
out:
kvm_arch_exit();
- kvm_exit_debug();
out_fail:
return r;
}
void kvm_exit(void)
{
- kvm_trace_cleanup();
+ kvm_exit_debug();
misc_deregister(&kvm_dev);
kmem_cache_destroy(kvm_vcpu_cache);
sysdev_unregister(&kvm_sysdev);
on_each_cpu(hardware_disable, NULL, 1);
kvm_arch_hardware_unsetup();
kvm_arch_exit();
- kvm_exit_debug();
free_cpumask_var(cpus_hardware_enabled);
__free_page(bad_page);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff