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-rw-r--r--virt/kvm/Kconfig3
-rw-r--r--virt/kvm/assigned-dev.c125
-rw-r--r--virt/kvm/async_pf.c216
-rw-r--r--virt/kvm/async_pf.h36
-rw-r--r--virt/kvm/eventfd.c91
-rw-r--r--virt/kvm/irq_comm.c7
-rw-r--r--virt/kvm/kvm_main.c373
7 files changed, 666 insertions, 185 deletions
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 7f1178f6b839..f63ccb0a5982 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -15,3 +15,6 @@ config KVM_APIC_ARCHITECTURE
config KVM_MMIO
bool
+
+config KVM_ASYNC_PF
+ bool
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index 7c98928b09d9..ae72ae604c89 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -55,58 +55,31 @@ static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
return index;
}
-static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
+static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
{
- struct kvm_assigned_dev_kernel *assigned_dev;
- int i;
+ struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+ u32 vector;
+ int index;
- assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
- interrupt_work);
+ if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
+ spin_lock(&assigned_dev->intx_lock);
+ disable_irq_nosync(irq);
+ assigned_dev->host_irq_disabled = true;
+ spin_unlock(&assigned_dev->intx_lock);
+ }
- spin_lock_irq(&assigned_dev->assigned_dev_lock);
if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
- struct kvm_guest_msix_entry *guest_entries =
- assigned_dev->guest_msix_entries;
- for (i = 0; i < assigned_dev->entries_nr; i++) {
- if (!(guest_entries[i].flags &
- KVM_ASSIGNED_MSIX_PENDING))
- continue;
- guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING;
+ index = find_index_from_host_irq(assigned_dev, irq);
+ if (index >= 0) {
+ vector = assigned_dev->
+ guest_msix_entries[index].vector;
kvm_set_irq(assigned_dev->kvm,
- assigned_dev->irq_source_id,
- guest_entries[i].vector, 1);
+ assigned_dev->irq_source_id, vector, 1);
}
} else
kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
assigned_dev->guest_irq, 1);
- spin_unlock_irq(&assigned_dev->assigned_dev_lock);
-}
-
-static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
-{
- unsigned long flags;
- struct kvm_assigned_dev_kernel *assigned_dev =
- (struct kvm_assigned_dev_kernel *) dev_id;
-
- spin_lock_irqsave(&assigned_dev->assigned_dev_lock, flags);
- if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
- int index = find_index_from_host_irq(assigned_dev, irq);
- if (index < 0)
- goto out;
- assigned_dev->guest_msix_entries[index].flags |=
- KVM_ASSIGNED_MSIX_PENDING;
- }
-
- schedule_work(&assigned_dev->interrupt_work);
-
- if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
- disable_irq_nosync(irq);
- assigned_dev->host_irq_disabled = true;
- }
-
-out:
- spin_unlock_irqrestore(&assigned_dev->assigned_dev_lock, flags);
return IRQ_HANDLED;
}
@@ -114,7 +87,6 @@ out:
static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
{
struct kvm_assigned_dev_kernel *dev;
- unsigned long flags;
if (kian->gsi == -1)
return;
@@ -127,12 +99,12 @@ static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
/* The guest irq may be shared so this ack may be
* from another device.
*/
- spin_lock_irqsave(&dev->assigned_dev_lock, flags);
+ spin_lock(&dev->intx_lock);
if (dev->host_irq_disabled) {
enable_irq(dev->host_irq);
dev->host_irq_disabled = false;
}
- spin_unlock_irqrestore(&dev->assigned_dev_lock, flags);
+ spin_unlock(&dev->intx_lock);
}
static void deassign_guest_irq(struct kvm *kvm,
@@ -141,6 +113,9 @@ static void deassign_guest_irq(struct kvm *kvm,
kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
assigned_dev->ack_notifier.gsi = -1;
+ kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
+ assigned_dev->guest_irq, 0);
+
if (assigned_dev->irq_source_id != -1)
kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
assigned_dev->irq_source_id = -1;
@@ -152,28 +127,19 @@ static void deassign_host_irq(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
/*
- * 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.
+ * 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.
+ * on a currently running IRQ handler.
*/
if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
int i;
for (i = 0; i < assigned_dev->entries_nr; i++)
- disable_irq_nosync(assigned_dev->
- host_msix_entries[i].vector);
-
- cancel_work_sync(&assigned_dev->interrupt_work);
+ disable_irq(assigned_dev->host_msix_entries[i].vector);
for (i = 0; i < assigned_dev->entries_nr; i++)
free_irq(assigned_dev->host_msix_entries[i].vector,
@@ -185,8 +151,7 @@ static void deassign_host_irq(struct kvm *kvm,
pci_disable_msix(assigned_dev->dev);
} else {
/* Deal with MSI and INTx */
- disable_irq_nosync(assigned_dev->host_irq);
- cancel_work_sync(&assigned_dev->interrupt_work);
+ disable_irq(assigned_dev->host_irq);
free_irq(assigned_dev->host_irq, (void *)assigned_dev);
@@ -232,7 +197,8 @@ static void kvm_free_assigned_device(struct kvm *kvm,
{
kvm_free_assigned_irq(kvm, assigned_dev);
- pci_reset_function(assigned_dev->dev);
+ __pci_reset_function(assigned_dev->dev);
+ pci_restore_state(assigned_dev->dev);
pci_release_regions(assigned_dev->dev);
pci_disable_device(assigned_dev->dev);
@@ -265,8 +231,8 @@ static int assigned_device_enable_host_intx(struct kvm *kvm,
* on the same interrupt line is not a happy situation: there
* are going to be long delays in accepting, acking, etc.
*/
- if (request_irq(dev->host_irq, kvm_assigned_dev_intr,
- 0, "kvm_assigned_intx_device", (void *)dev))
+ if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
+ IRQF_ONESHOT, dev->irq_name, (void *)dev))
return -EIO;
return 0;
}
@@ -284,8 +250,8 @@ static int assigned_device_enable_host_msi(struct kvm *kvm,
}
dev->host_irq = dev->dev->irq;
- if (request_irq(dev->host_irq, kvm_assigned_dev_intr, 0,
- "kvm_assigned_msi_device", (void *)dev)) {
+ if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
+ 0, dev->irq_name, (void *)dev)) {
pci_disable_msi(dev->dev);
return -EIO;
}
@@ -310,10 +276,9 @@ static int assigned_device_enable_host_msix(struct kvm *kvm,
return r;
for (i = 0; i < dev->entries_nr; i++) {
- r = request_irq(dev->host_msix_entries[i].vector,
- kvm_assigned_dev_intr, 0,
- "kvm_assigned_msix_device",
- (void *)dev);
+ r = request_threaded_irq(dev->host_msix_entries[i].vector,
+ NULL, kvm_assigned_dev_thread,
+ 0, dev->irq_name, (void *)dev);
if (r)
goto err;
}
@@ -370,6 +335,9 @@ static int assign_host_irq(struct kvm *kvm,
if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
return r;
+ snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
+ pci_name(dev->dev));
+
switch (host_irq_type) {
case KVM_DEV_IRQ_HOST_INTX:
r = assigned_device_enable_host_intx(kvm, dev);
@@ -547,6 +515,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
}
pci_reset_function(dev);
+ pci_save_state(dev);
match->assigned_dev_id = assigned_dev->assigned_dev_id;
match->host_segnr = assigned_dev->segnr;
@@ -554,12 +523,10 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
match->host_devfn = assigned_dev->devfn;
match->flags = assigned_dev->flags;
match->dev = dev;
- spin_lock_init(&match->assigned_dev_lock);
+ spin_lock_init(&match->intx_lock);
match->irq_source_id = -1;
match->kvm = kvm;
match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
- INIT_WORK(&match->interrupt_work,
- kvm_assigned_dev_interrupt_work_handler);
list_add(&match->list, &kvm->arch.assigned_dev_head);
@@ -579,6 +546,7 @@ out:
mutex_unlock(&kvm->lock);
return r;
out_list_del:
+ pci_restore_state(dev);
list_del(&match->list);
pci_release_regions(dev);
out_disable:
@@ -651,9 +619,9 @@ static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
r = -ENOMEM;
goto msix_nr_out;
}
- adev->guest_msix_entries = kzalloc(
- sizeof(struct kvm_guest_msix_entry) *
- entry_nr->entry_nr, GFP_KERNEL);
+ adev->guest_msix_entries =
+ kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
+ GFP_KERNEL);
if (!adev->guest_msix_entries) {
kfree(adev->host_msix_entries);
r = -ENOMEM;
@@ -706,7 +674,7 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
- int r = -ENOTTY;
+ int r;
switch (ioctl) {
case KVM_ASSIGN_PCI_DEVICE: {
@@ -724,7 +692,6 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
r = -EOPNOTSUPP;
break;
}
-#ifdef KVM_CAP_ASSIGN_DEV_IRQ
case KVM_ASSIGN_DEV_IRQ: {
struct kvm_assigned_irq assigned_irq;
@@ -747,8 +714,6 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
goto out;
break;
}
-#endif
-#ifdef KVM_CAP_DEVICE_DEASSIGNMENT
case KVM_DEASSIGN_PCI_DEVICE: {
struct kvm_assigned_pci_dev assigned_dev;
@@ -760,7 +725,6 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
goto out;
break;
}
-#endif
#ifdef KVM_CAP_IRQ_ROUTING
case KVM_SET_GSI_ROUTING: {
struct kvm_irq_routing routing;
@@ -813,6 +777,9 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
break;
}
#endif
+ default:
+ r = -ENOTTY;
+ break;
}
out:
return r;
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
new file mode 100644
index 000000000000..74268b4c2ee1
--- /dev/null
+++ b/virt/kvm/async_pf.c
@@ -0,0 +1,216 @@
+/*
+ * kvm asynchronous fault support
+ *
+ * Copyright 2010 Red Hat, Inc.
+ *
+ * Author:
+ * Gleb Natapov <gleb@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/mmu_context.h>
+
+#include "async_pf.h"
+#include <trace/events/kvm.h>
+
+static struct kmem_cache *async_pf_cache;
+
+int kvm_async_pf_init(void)
+{
+ async_pf_cache = KMEM_CACHE(kvm_async_pf, 0);
+
+ if (!async_pf_cache)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void kvm_async_pf_deinit(void)
+{
+ if (async_pf_cache)
+ kmem_cache_destroy(async_pf_cache);
+ async_pf_cache = NULL;
+}
+
+void kvm_async_pf_vcpu_init(struct kvm_vcpu *vcpu)
+{
+ INIT_LIST_HEAD(&vcpu->async_pf.done);
+ INIT_LIST_HEAD(&vcpu->async_pf.queue);
+ spin_lock_init(&vcpu->async_pf.lock);
+}
+
+static void async_pf_execute(struct work_struct *work)
+{
+ struct page *page = NULL;
+ struct kvm_async_pf *apf =
+ container_of(work, struct kvm_async_pf, work);
+ struct mm_struct *mm = apf->mm;
+ struct kvm_vcpu *vcpu = apf->vcpu;
+ unsigned long addr = apf->addr;
+ gva_t gva = apf->gva;
+
+ might_sleep();
+
+ use_mm(mm);
+ down_read(&mm->mmap_sem);
+ get_user_pages(current, mm, addr, 1, 1, 0, &page, NULL);
+ up_read(&mm->mmap_sem);
+ unuse_mm(mm);
+
+ spin_lock(&vcpu->async_pf.lock);
+ list_add_tail(&apf->link, &vcpu->async_pf.done);
+ apf->page = page;
+ apf->done = true;
+ spin_unlock(&vcpu->async_pf.lock);
+
+ /*
+ * apf may be freed by kvm_check_async_pf_completion() after
+ * this point
+ */
+
+ trace_kvm_async_pf_completed(addr, page, gva);
+
+ if (waitqueue_active(&vcpu->wq))
+ wake_up_interruptible(&vcpu->wq);
+
+ mmdrop(mm);
+ kvm_put_kvm(vcpu->kvm);
+}
+
+void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu)
+{
+ /* cancel outstanding work queue item */
+ while (!list_empty(&vcpu->async_pf.queue)) {
+ struct kvm_async_pf *work =
+ list_entry(vcpu->async_pf.queue.next,
+ typeof(*work), queue);
+ cancel_work_sync(&work->work);
+ list_del(&work->queue);
+ if (!work->done) /* work was canceled */
+ kmem_cache_free(async_pf_cache, work);
+ }
+
+ spin_lock(&vcpu->async_pf.lock);
+ while (!list_empty(&vcpu->async_pf.done)) {
+ struct kvm_async_pf *work =
+ list_entry(vcpu->async_pf.done.next,
+ typeof(*work), link);
+ list_del(&work->link);
+ if (work->page)
+ put_page(work->page);
+ kmem_cache_free(async_pf_cache, work);
+ }
+ spin_unlock(&vcpu->async_pf.lock);
+
+ vcpu->async_pf.queued = 0;
+}
+
+void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
+{
+ struct kvm_async_pf *work;
+
+ while (!list_empty_careful(&vcpu->async_pf.done) &&
+ kvm_arch_can_inject_async_page_present(vcpu)) {
+ spin_lock(&vcpu->async_pf.lock);
+ work = list_first_entry(&vcpu->async_pf.done, typeof(*work),
+ link);
+ list_del(&work->link);
+ spin_unlock(&vcpu->async_pf.lock);
+
+ if (work->page)
+ kvm_arch_async_page_ready(vcpu, work);
+ kvm_arch_async_page_present(vcpu, work);
+
+ list_del(&work->queue);
+ vcpu->async_pf.queued--;
+ if (work->page)
+ put_page(work->page);
+ kmem_cache_free(async_pf_cache, work);
+ }
+}
+
+int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
+ struct kvm_arch_async_pf *arch)
+{
+ struct kvm_async_pf *work;
+
+ if (vcpu->async_pf.queued >= ASYNC_PF_PER_VCPU)
+ return 0;
+
+ /* setup delayed work */
+
+ /*
+ * do alloc nowait since if we are going to sleep anyway we
+ * may as well sleep faulting in page
+ */
+ work = kmem_cache_zalloc(async_pf_cache, GFP_NOWAIT);
+ if (!work)
+ return 0;
+
+ work->page = NULL;
+ work->done = false;
+ work->vcpu = vcpu;
+ work->gva = gva;
+ work->addr = gfn_to_hva(vcpu->kvm, gfn);
+ work->arch = *arch;
+ work->mm = current->mm;
+ atomic_inc(&work->mm->mm_count);
+ kvm_get_kvm(work->vcpu->kvm);
+
+ /* this can't really happen otherwise gfn_to_pfn_async
+ would succeed */
+ if (unlikely(kvm_is_error_hva(work->addr)))
+ goto retry_sync;
+
+ INIT_WORK(&work->work, async_pf_execute);
+ if (!schedule_work(&work->work))
+ goto retry_sync;
+
+ list_add_tail(&work->queue, &vcpu->async_pf.queue);
+ vcpu->async_pf.queued++;
+ kvm_arch_async_page_not_present(vcpu, work);
+ return 1;
+retry_sync:
+ kvm_put_kvm(work->vcpu->kvm);
+ mmdrop(work->mm);
+ kmem_cache_free(async_pf_cache, work);
+ return 0;
+}
+
+int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu)
+{
+ struct kvm_async_pf *work;
+
+ if (!list_empty_careful(&vcpu->async_pf.done))
+ return 0;
+
+ work = kmem_cache_zalloc(async_pf_cache, GFP_ATOMIC);
+ if (!work)
+ return -ENOMEM;
+
+ work->page = bad_page;
+ get_page(bad_page);
+ INIT_LIST_HEAD(&work->queue); /* for list_del to work */
+
+ spin_lock(&vcpu->async_pf.lock);
+ list_add_tail(&work->link, &vcpu->async_pf.done);
+ spin_unlock(&vcpu->async_pf.lock);
+
+ vcpu->async_pf.queued++;
+ return 0;
+}
diff --git a/virt/kvm/async_pf.h b/virt/kvm/async_pf.h
new file mode 100644
index 000000000000..e7ef6447cb82
--- /dev/null
+++ b/virt/kvm/async_pf.h
@@ -0,0 +1,36 @@
+/*
+ * kvm asynchronous fault support
+ *
+ * Copyright 2010 Red Hat, Inc.
+ *
+ * Author:
+ * Gleb Natapov <gleb@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __KVM_ASYNC_PF_H__
+#define __KVM_ASYNC_PF_H__
+
+#ifdef CONFIG_KVM_ASYNC_PF
+int kvm_async_pf_init(void);
+void kvm_async_pf_deinit(void);
+void kvm_async_pf_vcpu_init(struct kvm_vcpu *vcpu);
+#else
+#define kvm_async_pf_init() (0)
+#define kvm_async_pf_deinit() do{}while(0)
+#define kvm_async_pf_vcpu_init(C) do{}while(0)
+#endif
+
+#endif
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index c1f1e3c62984..2ca4535f4fb7 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -44,14 +44,19 @@
*/
struct _irqfd {
- struct kvm *kvm;
- struct eventfd_ctx *eventfd;
- int gsi;
- struct list_head list;
- poll_table pt;
- wait_queue_t wait;
- struct work_struct inject;
- struct work_struct shutdown;
+ /* Used for MSI fast-path */
+ struct kvm *kvm;
+ wait_queue_t wait;
+ /* Update side is protected by irqfds.lock */
+ struct kvm_kernel_irq_routing_entry __rcu *irq_entry;
+ /* Used for level IRQ fast-path */
+ int gsi;
+ struct work_struct inject;
+ /* Used for setup/shutdown */
+ struct eventfd_ctx *eventfd;
+ struct list_head list;
+ poll_table pt;
+ struct work_struct shutdown;
};
static struct workqueue_struct *irqfd_cleanup_wq;
@@ -125,14 +130,22 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
{
struct _irqfd *irqfd = container_of(wait, struct _irqfd, wait);
unsigned long flags = (unsigned long)key;
+ struct kvm_kernel_irq_routing_entry *irq;
+ struct kvm *kvm = irqfd->kvm;
- if (flags & POLLIN)
+ if (flags & POLLIN) {
+ rcu_read_lock();
+ irq = rcu_dereference(irqfd->irq_entry);
/* An event has been signaled, inject an interrupt */
- schedule_work(&irqfd->inject);
+ if (irq)
+ kvm_set_msi(irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1);
+ else
+ schedule_work(&irqfd->inject);
+ rcu_read_unlock();
+ }
if (flags & POLLHUP) {
/* The eventfd is closing, detach from KVM */
- struct kvm *kvm = irqfd->kvm;
unsigned long flags;
spin_lock_irqsave(&kvm->irqfds.lock, flags);
@@ -163,9 +176,31 @@ irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh,
add_wait_queue(wqh, &irqfd->wait);
}
+/* Must be called under irqfds.lock */
+static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd,
+ struct kvm_irq_routing_table *irq_rt)
+{
+ struct kvm_kernel_irq_routing_entry *e;
+ struct hlist_node *n;
+
+ if (irqfd->gsi >= irq_rt->nr_rt_entries) {
+ rcu_assign_pointer(irqfd->irq_entry, NULL);
+ return;
+ }
+
+ hlist_for_each_entry(e, n, &irq_rt->map[irqfd->gsi], link) {
+ /* Only fast-path MSI. */
+ if (e->type == KVM_IRQ_ROUTING_MSI)
+ rcu_assign_pointer(irqfd->irq_entry, e);
+ else
+ rcu_assign_pointer(irqfd->irq_entry, NULL);
+ }
+}
+
static int
kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
{
+ struct kvm_irq_routing_table *irq_rt;
struct _irqfd *irqfd, *tmp;
struct file *file = NULL;
struct eventfd_ctx *eventfd = NULL;
@@ -215,6 +250,10 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
goto fail;
}
+ irq_rt = rcu_dereference_protected(kvm->irq_routing,
+ lockdep_is_held(&kvm->irqfds.lock));
+ irqfd_update(kvm, irqfd, irq_rt);
+
events = file->f_op->poll(file, &irqfd->pt);
list_add_tail(&irqfd->list, &kvm->irqfds.items);
@@ -271,8 +310,17 @@ kvm_irqfd_deassign(struct kvm *kvm, int fd, int gsi)
spin_lock_irq(&kvm->irqfds.lock);
list_for_each_entry_safe(irqfd, tmp, &kvm->irqfds.items, list) {
- if (irqfd->eventfd == eventfd && irqfd->gsi == gsi)
+ if (irqfd->eventfd == eventfd && irqfd->gsi == gsi) {
+ /*
+ * This rcu_assign_pointer is needed for when
+ * another thread calls kvm_irqfd_update before
+ * we flush workqueue below.
+ * It is paired with synchronize_rcu done by caller
+ * of that function.
+ */
+ rcu_assign_pointer(irqfd->irq_entry, NULL);
irqfd_deactivate(irqfd);
+ }
}
spin_unlock_irq(&kvm->irqfds.lock);
@@ -322,6 +370,25 @@ kvm_irqfd_release(struct kvm *kvm)
}
/*
+ * Change irq_routing and irqfd.
+ * Caller must invoke synchronize_rcu afterwards.
+ */
+void kvm_irq_routing_update(struct kvm *kvm,
+ struct kvm_irq_routing_table *irq_rt)
+{
+ struct _irqfd *irqfd;
+
+ spin_lock_irq(&kvm->irqfds.lock);
+
+ rcu_assign_pointer(kvm->irq_routing, irq_rt);
+
+ list_for_each_entry(irqfd, &kvm->irqfds.items, list)
+ irqfd_update(kvm, irqfd, irq_rt);
+
+ spin_unlock_irq(&kvm->irqfds.lock);
+}
+
+/*
* create a host-wide workqueue for issuing deferred shutdown requests
* aggregated from all vm* instances. We need our own isolated single-thread
* queue to prevent deadlock against flushing the normal work-queue.
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 8edca9141b78..9f614b4e365f 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -114,8 +114,8 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
return r;
}
-static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
- struct kvm *kvm, int irq_source_id, int level)
+int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id, int level)
{
struct kvm_lapic_irq irq;
@@ -409,8 +409,9 @@ int kvm_set_irq_routing(struct kvm *kvm,
mutex_lock(&kvm->irq_lock);
old = kvm->irq_routing;
- rcu_assign_pointer(kvm->irq_routing, new);
+ kvm_irq_routing_update(kvm, new);
mutex_unlock(&kvm->irq_lock);
+
synchronize_rcu();
new = old;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5225052aebc1..f29abeb6a912 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -55,6 +55,7 @@
#include <asm-generic/bitops/le.h>
#include "coalesced_mmio.h"
+#include "async_pf.h"
#define CREATE_TRACE_POINTS
#include <trace/events/kvm.h>
@@ -89,7 +90,8 @@ static void hardware_disable_all(void);
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;
@@ -102,8 +104,26 @@ static pfn_t fault_pfn;
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;
@@ -167,8 +187,12 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
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)
@@ -186,6 +210,7 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
vcpu->kvm = kvm;
vcpu->vcpu_id = id;
init_waitqueue_head(&vcpu->wq);
+ kvm_async_pf_vcpu_init(vcpu);
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page) {
@@ -247,7 +272,7 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
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);
@@ -291,6 +316,7 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
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);
@@ -344,6 +370,22 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
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)
{
@@ -360,6 +402,7 @@ 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,
+ .test_young = kvm_mmu_notifier_test_young,
.change_pte = kvm_mmu_notifier_change_pte,
.release = kvm_mmu_notifier_release,
};
@@ -381,11 +424,15 @@ static int kvm_init_mmu_notifier(struct kvm *kvm)
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)
@@ -399,23 +446,19 @@ static struct kvm *kvm_create_vm(void)
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);
@@ -429,19 +472,35 @@ static struct kvm *kvm_create_vm(void)
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);
}
+static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
+{
+ if (!memslot->dirty_bitmap)
+ return;
+
+ if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
+ vfree(memslot->dirty_bitmap_head);
+ else
+ kfree(memslot->dirty_bitmap_head);
+
+ memslot->dirty_bitmap = NULL;
+ memslot->dirty_bitmap_head = NULL;
+}
+
/*
* Free any memory in @free but not in @dont.
*/
@@ -454,7 +513,7 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
vfree(free->rmap);
if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
- vfree(free->dirty_bitmap);
+ kvm_destroy_dirty_bitmap(free);
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
@@ -465,7 +524,6 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
}
free->npages = 0;
- free->dirty_bitmap = NULL;
free->rmap = NULL;
}
@@ -499,6 +557,9 @@ static void kvm_destroy_vm(struct kvm *kvm)
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);
}
@@ -528,6 +589,27 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
}
/*
+ * Allocation size is twice as large as the actual dirty bitmap size.
+ * This makes it possible to do double buffering: see x86's
+ * kvm_vm_ioctl_get_dirty_log().
+ */
+static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
+{
+ unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
+
+ if (dirty_bytes > PAGE_SIZE)
+ memslot->dirty_bitmap = vzalloc(dirty_bytes);
+ else
+ memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
+
+ if (!memslot->dirty_bitmap)
+ return -ENOMEM;
+
+ memslot->dirty_bitmap_head = memslot->dirty_bitmap;
+ return 0;
+}
+
+/*
* Allocate some memory and give it an address in the guest physical address
* space.
*
@@ -604,13 +686,11 @@ int __kvm_set_memory_region(struct kvm *kvm,
/* 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;
}
@@ -633,14 +713,11 @@ int __kvm_set_memory_region(struct kvm *kvm,
>> 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))
@@ -661,12 +738,8 @@ skip_lpage:
/* Allocate page dirty bitmap if needed */
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
- unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
-
- new.dirty_bitmap = vmalloc(dirty_bytes);
- if (!new.dirty_bitmap)
+ if (kvm_create_dirty_bitmap(&new) < 0)
goto out_free;
- memset(new.dirty_bitmap, 0, dirty_bytes);
/* destroy any largepage mappings for dirty tracking */
if (old.npages)
flush_shadow = 1;
@@ -685,6 +758,7 @@ skip_lpage:
memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
if (mem->slot >= slots->nmemslots)
slots->nmemslots = mem->slot + 1;
+ slots->generation++;
slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
old_memslots = kvm->memslots;
@@ -719,6 +793,7 @@ skip_lpage:
memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
if (mem->slot >= slots->nmemslots)
slots->nmemslots = mem->slot + 1;
+ slots->generation++;
/* actual memory is freed via old in kvm_free_physmem_slot below */
if (!npages) {
@@ -849,10 +924,10 @@ int kvm_is_error_hva(unsigned long addr)
}
EXPORT_SYMBOL_GPL(kvm_is_error_hva);
-struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
+static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
+ gfn_t gfn)
{
int i;
- struct kvm_memslots *slots = kvm_memslots(kvm);
for (i = 0; i < slots->nmemslots; ++i) {
struct kvm_memory_slot *memslot = &slots->memslots[i];
@@ -863,6 +938,11 @@ struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
}
return NULL;
}
+
+struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
+{
+ return __gfn_to_memslot(kvm_memslots(kvm), gfn);
+}
EXPORT_SYMBOL_GPL(gfn_to_memslot);
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
@@ -925,12 +1005,9 @@ int memslot_id(struct kvm *kvm, gfn_t gfn)
return memslot - slots->memslots;
}
-static unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn,
+static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
gfn_t *nr_pages)
{
- struct kvm_memory_slot *slot;
-
- slot = gfn_to_memslot(kvm, gfn);
if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
return bad_hva();
@@ -942,28 +1019,61 @@ static unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn,
unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
{
- return gfn_to_hva_many(kvm, gfn, NULL);
+ return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
}
EXPORT_SYMBOL_GPL(gfn_to_hva);
-static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic)
+static pfn_t get_fault_pfn(void)
+{
+ get_page(fault_page);
+ return fault_pfn;
+}
+
+static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
+ bool *async, bool write_fault, bool *writable)
{
struct page *page[1];
- int npages;
+ int npages = 0;
pfn_t pfn;
- if (atomic)
+ /* we can do it either atomically or asynchronously, not both */
+ BUG_ON(atomic && async);
+
+ BUG_ON(!write_fault && !writable);
+
+ if (writable)
+ *writable = true;
+
+ if (atomic || async)
npages = __get_user_pages_fast(addr, 1, 1, page);
- else {
+
+ if (unlikely(npages != 1) && !atomic) {
might_sleep();
- npages = get_user_pages_fast(addr, 1, 1, page);
+
+ if (writable)
+ *writable = write_fault;
+
+ npages = get_user_pages_fast(addr, 1, write_fault, page);
+
+ /* map read fault as writable if possible */
+ if (unlikely(!write_fault) && npages == 1) {
+ struct page *wpage[1];
+
+ npages = __get_user_pages_fast(addr, 1, 1, wpage);
+ if (npages == 1) {
+ *writable = true;
+ put_page(page[0]);
+ page[0] = wpage[0];
+ }
+ npages = 1;
+ }
}
if (unlikely(npages != 1)) {
struct vm_area_struct *vma;
if (atomic)
- goto return_fault_page;
+ return get_fault_pfn();
down_read(&current->mm->mmap_sem);
if (is_hwpoison_address(addr)) {
@@ -972,19 +1082,20 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic)
return page_to_pfn(hwpoison_page);
}
- vma = find_vma(current->mm, addr);
-
- if (vma == NULL || addr < vma->vm_start ||
- !(vma->vm_flags & VM_PFNMAP)) {
- up_read(&current->mm->mmap_sem);
-return_fault_page:
- get_page(fault_page);
- return page_to_pfn(fault_page);
+ vma = find_vma_intersection(current->mm, addr, addr+1);
+
+ if (vma == NULL)
+ pfn = get_fault_pfn();
+ else if ((vma->vm_flags & VM_PFNMAP)) {
+ pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
+ vma->vm_pgoff;
+ BUG_ON(!kvm_is_mmio_pfn(pfn));
+ } else {
+ if (async && (vma->vm_flags & VM_WRITE))
+ *async = true;
+ pfn = get_fault_pfn();
}
-
- pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
up_read(&current->mm->mmap_sem);
- BUG_ON(!kvm_is_mmio_pfn(pfn));
} else
pfn = page_to_pfn(page[0]);
@@ -993,40 +1104,58 @@ return_fault_page:
pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
{
- return hva_to_pfn(kvm, addr, true);
+ return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
}
EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
-static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic)
+static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
+ bool write_fault, bool *writable)
{
unsigned long addr;
+ if (async)
+ *async = false;
+
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, atomic);
+ return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
}
pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
{
- return __gfn_to_pfn(kvm, gfn, true);
+ return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
}
EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
+pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
+ bool write_fault, bool *writable)
+{
+ return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
+}
+EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
+
pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
{
- return __gfn_to_pfn(kvm, gfn, false);
+ return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
}
EXPORT_SYMBOL_GPL(gfn_to_pfn);
+pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
+ bool *writable)
+{
+ return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
+}
+EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
+
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, false);
+ return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
}
int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
@@ -1035,7 +1164,7 @@ int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
unsigned long addr;
gfn_t entry;
- addr = gfn_to_hva_many(kvm, gfn, &entry);
+ addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
if (kvm_is_error_hva(addr))
return -1;
@@ -1219,9 +1348,51 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
return 0;
}
+int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
+ gpa_t gpa)
+{
+ struct kvm_memslots *slots = kvm_memslots(kvm);
+ int offset = offset_in_page(gpa);
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+
+ ghc->gpa = gpa;
+ ghc->generation = slots->generation;
+ ghc->memslot = __gfn_to_memslot(slots, gfn);
+ ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
+ if (!kvm_is_error_hva(ghc->hva))
+ ghc->hva += offset;
+ else
+ return -EFAULT;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
+
+int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
+ void *data, unsigned long len)
+{
+ struct kvm_memslots *slots = kvm_memslots(kvm);
+ int r;
+
+ if (slots->generation != ghc->generation)
+ kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
+
+ if (kvm_is_error_hva(ghc->hva))
+ return -EFAULT;
+
+ r = copy_to_user((void __user *)ghc->hva, data, len);
+ if (r)
+ return -EFAULT;
+ mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
+
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
{
- return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
+ return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
+ offset, len);
}
EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
@@ -1244,11 +1415,9 @@ int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
}
EXPORT_SYMBOL_GPL(kvm_clear_guest);
-void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
+void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
+ gfn_t gfn)
{
- struct kvm_memory_slot *memslot;
-
- memslot = gfn_to_memslot(kvm, gfn);
if (memslot && memslot->dirty_bitmap) {
unsigned long rel_gfn = gfn - memslot->base_gfn;
@@ -1256,6 +1425,14 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
}
}
+void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
+{
+ struct kvm_memory_slot *memslot;
+
+ memslot = gfn_to_memslot(kvm, gfn);
+ mark_page_dirty_in_slot(kvm, memslot, gfn);
+}
+
/*
* The vCPU has executed a HLT instruction with in-kernel mode enabled.
*/
@@ -1457,6 +1634,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
if (arg)
goto out;
r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
+ trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
break;
case KVM_GET_REGS: {
struct kvm_regs *kvm_regs;
@@ -1824,7 +2002,7 @@ static struct file_operations kvm_vm_fops = {
static int kvm_dev_ioctl_create_vm(void)
{
- int fd, r;
+ int r;
struct kvm *kvm;
kvm = kvm_create_vm();
@@ -1837,11 +2015,11 @@ static int kvm_dev_ioctl_create_vm(void)
return r;
}
#endif
- fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
- if (fd < 0)
+ r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
+ if (r < 0)
kvm_put_kvm(kvm);
- return fd;
+ return r;
}
static long kvm_dev_ioctl_check_extension_generic(long arg)
@@ -1922,7 +2100,7 @@ static struct miscdevice kvm_dev = {
&kvm_chardev_ops,
};
-static void hardware_enable(void *junk)
+static void hardware_enable_nolock(void *junk)
{
int cpu = raw_smp_processor_id();
int r;
@@ -1942,7 +2120,14 @@ static void hardware_enable(void *junk)
}
}
-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();
@@ -1952,13 +2137,20 @@ static void hardware_disable(void *junk)
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)
@@ -1977,7 +2169,7 @@ static int hardware_enable_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();
@@ -2008,27 +2200,19 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
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)
@@ -2041,7 +2225,7 @@ static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
*/
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;
}
@@ -2211,7 +2395,7 @@ static void kvm_exit_debug(void)
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;
}
@@ -2219,7 +2403,7 @@ static int kvm_resume(struct sys_device *dev)
{
if (kvm_usage_count) {
WARN_ON(spin_is_locked(&kvm_lock));
- hardware_enable(NULL);
+ hardware_enable_nolock(NULL);
}
return 0;
}
@@ -2336,6 +2520,10 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
goto out_free_5;
}
+ r = kvm_async_pf_init();
+ if (r)
+ goto out_free;
+
kvm_chardev_ops.owner = module;
kvm_vm_fops.owner = module;
kvm_vcpu_fops.owner = module;
@@ -2343,7 +2531,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
r = misc_register(&kvm_dev);
if (r) {
printk(KERN_ERR "kvm: misc device register failed\n");
- goto out_free;
+ goto out_unreg;
}
kvm_preempt_ops.sched_in = kvm_sched_in;
@@ -2353,6 +2541,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
return 0;
+out_unreg:
+ kvm_async_pf_deinit();
out_free:
kmem_cache_destroy(kvm_vcpu_cache);
out_free_5:
@@ -2385,11 +2575,12 @@ void kvm_exit(void)
kvm_exit_debug();
misc_deregister(&kvm_dev);
kmem_cache_destroy(kvm_vcpu_cache);
+ kvm_async_pf_deinit();
sysdev_unregister(&kvm_sysdev);
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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-04 13:46:14 +0000