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Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/Kconfig3
-rw-r--r--virt/kvm/assigned-dev.c13
-rw-r--r--virt/kvm/coalesced_mmio.c44
-rw-r--r--virt/kvm/coalesced_mmio.h15
-rw-r--r--virt/kvm/eventfd.c22
-rw-r--r--virt/kvm/ioapic.c39
-rw-r--r--virt/kvm/ioapic.h2
-rw-r--r--virt/kvm/iommu.c36
-rw-r--r--virt/kvm/irq_comm.c1
-rw-r--r--virt/kvm/kvm_main.c411
10 files changed, 402 insertions, 184 deletions
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index daece36c0a57..7f1178f6b839 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -12,3 +12,6 @@ config HAVE_KVM_EVENTFD
config KVM_APIC_ARCHITECTURE
bool
+
+config KVM_MMIO
+ bool
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index f73de631e3ee..02ff2b19dbe2 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -16,6 +16,7 @@
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
+#include <linux/slab.h>
#include "irq.h"
static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
@@ -504,12 +505,12 @@ out:
static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
struct kvm_assigned_pci_dev *assigned_dev)
{
- int r = 0;
+ int r = 0, idx;
struct kvm_assigned_dev_kernel *match;
struct pci_dev *dev;
mutex_lock(&kvm->lock);
- down_read(&kvm->slots_lock);
+ idx = srcu_read_lock(&kvm->srcu);
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
assigned_dev->assigned_dev_id);
@@ -526,7 +527,8 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
r = -ENOMEM;
goto out;
}
- dev = pci_get_bus_and_slot(assigned_dev->busnr,
+ dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
+ assigned_dev->busnr,
assigned_dev->devfn);
if (!dev) {
printk(KERN_INFO "%s: host device not found\n", __func__);
@@ -548,6 +550,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
pci_reset_function(dev);
match->assigned_dev_id = assigned_dev->assigned_dev_id;
+ match->host_segnr = assigned_dev->segnr;
match->host_busnr = assigned_dev->busnr;
match->host_devfn = assigned_dev->devfn;
match->flags = assigned_dev->flags;
@@ -573,7 +576,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
}
out:
- up_read(&kvm->slots_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
mutex_unlock(&kvm->lock);
return r;
out_list_del:
@@ -585,7 +588,7 @@ out_put:
pci_dev_put(dev);
out_free:
kfree(match);
- up_read(&kvm->slots_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
mutex_unlock(&kvm->lock);
return r;
}
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 04d69cd7049b..36e258029649 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -10,6 +10,7 @@
#include "iodev.h"
#include <linux/kvm_host.h>
+#include <linux/slab.h>
#include <linux/kvm.h>
#include "coalesced_mmio.h"
@@ -92,41 +93,64 @@ static const struct kvm_io_device_ops coalesced_mmio_ops = {
int kvm_coalesced_mmio_init(struct kvm *kvm)
{
struct kvm_coalesced_mmio_dev *dev;
+ struct page *page;
int ret;
+ ret = -ENOMEM;
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ goto out_err;
+ kvm->coalesced_mmio_ring = page_address(page);
+
+ ret = -ENOMEM;
dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
if (!dev)
- return -ENOMEM;
+ goto out_free_page;
spin_lock_init(&dev->lock);
kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
dev->kvm = kvm;
kvm->coalesced_mmio_dev = dev;
- ret = kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &dev->dev);
+ mutex_lock(&kvm->slots_lock);
+ ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, &dev->dev);
+ mutex_unlock(&kvm->slots_lock);
if (ret < 0)
- kfree(dev);
+ goto out_free_dev;
+
+ return ret;
+out_free_dev:
+ kfree(dev);
+out_free_page:
+ __free_page(page);
+out_err:
return ret;
}
+void kvm_coalesced_mmio_free(struct kvm *kvm)
+{
+ if (kvm->coalesced_mmio_ring)
+ free_page((unsigned long)kvm->coalesced_mmio_ring);
+}
+
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
- struct kvm_coalesced_mmio_zone *zone)
+ struct kvm_coalesced_mmio_zone *zone)
{
struct kvm_coalesced_mmio_dev *dev = kvm->coalesced_mmio_dev;
if (dev == NULL)
return -EINVAL;
- down_write(&kvm->slots_lock);
+ mutex_lock(&kvm->slots_lock);
if (dev->nb_zones >= KVM_COALESCED_MMIO_ZONE_MAX) {
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return -ENOBUFS;
}
dev->zone[dev->nb_zones] = *zone;
dev->nb_zones++;
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return 0;
}
@@ -140,10 +164,10 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
if (dev == NULL)
return -EINVAL;
- down_write(&kvm->slots_lock);
+ mutex_lock(&kvm->slots_lock);
i = dev->nb_zones;
- while(i) {
+ while (i) {
z = &dev->zone[i - 1];
/* unregister all zones
@@ -158,7 +182,7 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
i--;
}
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return 0;
}
diff --git a/virt/kvm/coalesced_mmio.h b/virt/kvm/coalesced_mmio.h
index 4b49f27fa31e..8a5959e3535f 100644
--- a/virt/kvm/coalesced_mmio.h
+++ b/virt/kvm/coalesced_mmio.h
@@ -1,3 +1,6 @@
+#ifndef __KVM_COALESCED_MMIO_H__
+#define __KVM_COALESCED_MMIO_H__
+
/*
* KVM coalesced MMIO
*
@@ -7,6 +10,8 @@
*
*/
+#ifdef CONFIG_KVM_MMIO
+
#define KVM_COALESCED_MMIO_ZONE_MAX 100
struct kvm_coalesced_mmio_dev {
@@ -18,7 +23,17 @@ struct kvm_coalesced_mmio_dev {
};
int kvm_coalesced_mmio_init(struct kvm *kvm);
+void kvm_coalesced_mmio_free(struct kvm *kvm);
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
struct kvm_coalesced_mmio_zone *zone);
int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
struct kvm_coalesced_mmio_zone *zone);
+
+#else
+
+static inline int kvm_coalesced_mmio_init(struct kvm *kvm) { return 0; }
+static inline void kvm_coalesced_mmio_free(struct kvm *kvm) { }
+
+#endif
+
+#endif
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index a9d3fc6c681c..b81f0ebbaaad 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -30,6 +30,7 @@
#include <linux/list.h>
#include <linux/eventfd.h>
#include <linux/kernel.h>
+#include <linux/slab.h>
#include "iodev.h"
@@ -47,7 +48,6 @@ struct _irqfd {
int gsi;
struct list_head list;
poll_table pt;
- wait_queue_head_t *wqh;
wait_queue_t wait;
struct work_struct inject;
struct work_struct shutdown;
@@ -159,8 +159,6 @@ irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh,
poll_table *pt)
{
struct _irqfd *irqfd = container_of(pt, struct _irqfd, pt);
-
- irqfd->wqh = wqh;
add_wait_queue(wqh, &irqfd->wait);
}
@@ -463,7 +461,7 @@ static int
kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{
int pio = args->flags & KVM_IOEVENTFD_FLAG_PIO;
- struct kvm_io_bus *bus = pio ? &kvm->pio_bus : &kvm->mmio_bus;
+ enum kvm_bus bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS;
struct _ioeventfd *p;
struct eventfd_ctx *eventfd;
int ret;
@@ -508,7 +506,7 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
else
p->wildcard = true;
- down_write(&kvm->slots_lock);
+ mutex_lock(&kvm->slots_lock);
/* Verify that there isnt a match already */
if (ioeventfd_check_collision(kvm, p)) {
@@ -518,18 +516,18 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
kvm_iodevice_init(&p->dev, &ioeventfd_ops);
- ret = __kvm_io_bus_register_dev(bus, &p->dev);
+ ret = kvm_io_bus_register_dev(kvm, bus_idx, &p->dev);
if (ret < 0)
goto unlock_fail;
list_add_tail(&p->list, &kvm->ioeventfds);
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return 0;
unlock_fail:
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
fail:
kfree(p);
@@ -542,7 +540,7 @@ static int
kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{
int pio = args->flags & KVM_IOEVENTFD_FLAG_PIO;
- struct kvm_io_bus *bus = pio ? &kvm->pio_bus : &kvm->mmio_bus;
+ enum kvm_bus bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS;
struct _ioeventfd *p, *tmp;
struct eventfd_ctx *eventfd;
int ret = -ENOENT;
@@ -551,7 +549,7 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
if (IS_ERR(eventfd))
return PTR_ERR(eventfd);
- down_write(&kvm->slots_lock);
+ mutex_lock(&kvm->slots_lock);
list_for_each_entry_safe(p, tmp, &kvm->ioeventfds, list) {
bool wildcard = !(args->flags & KVM_IOEVENTFD_FLAG_DATAMATCH);
@@ -565,13 +563,13 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
if (!p->wildcard && p->datamatch != args->datamatch)
continue;
- __kvm_io_bus_unregister_dev(bus, &p->dev);
+ kvm_io_bus_unregister_dev(kvm, bus_idx, &p->dev);
ioeventfd_release(p);
ret = 0;
break;
}
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
eventfd_ctx_put(eventfd);
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 38a2d20b89de..03a5eb22da2b 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -33,6 +33,7 @@
#include <linux/smp.h>
#include <linux/hrtimer.h>
#include <linux/io.h>
+#include <linux/slab.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/current.h>
@@ -100,6 +101,19 @@ static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
return injected;
}
+static void update_handled_vectors(struct kvm_ioapic *ioapic)
+{
+ DECLARE_BITMAP(handled_vectors, 256);
+ int i;
+
+ memset(handled_vectors, 0, sizeof(handled_vectors));
+ for (i = 0; i < IOAPIC_NUM_PINS; ++i)
+ __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors);
+ memcpy(ioapic->handled_vectors, handled_vectors,
+ sizeof(handled_vectors));
+ smp_wmb();
+}
+
static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
{
unsigned index;
@@ -134,6 +148,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
e->bits |= (u32) val;
e->fields.remote_irr = 0;
}
+ update_handled_vectors(ioapic);
mask_after = e->fields.mask;
if (mask_before != mask_after)
kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after);
@@ -241,6 +256,9 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
+ smp_rmb();
+ if (!test_bit(vector, ioapic->handled_vectors))
+ return;
mutex_lock(&ioapic->lock);
__kvm_ioapic_update_eoi(ioapic, vector, trigger_mode);
mutex_unlock(&ioapic->lock);
@@ -352,6 +370,7 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
ioapic->ioregsel = 0;
ioapic->irr = 0;
ioapic->id = 0;
+ update_handled_vectors(ioapic);
}
static const struct kvm_io_device_ops ioapic_mmio_ops = {
@@ -372,13 +391,28 @@ int kvm_ioapic_init(struct kvm *kvm)
kvm_ioapic_reset(ioapic);
kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
ioapic->kvm = kvm;
- ret = kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &ioapic->dev);
- if (ret < 0)
+ mutex_lock(&kvm->slots_lock);
+ ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
+ mutex_unlock(&kvm->slots_lock);
+ if (ret < 0) {
+ kvm->arch.vioapic = NULL;
kfree(ioapic);
+ }
return ret;
}
+void kvm_ioapic_destroy(struct kvm *kvm)
+{
+ struct kvm_ioapic *ioapic = kvm->arch.vioapic;
+
+ if (ioapic) {
+ kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
+ kvm->arch.vioapic = NULL;
+ kfree(ioapic);
+ }
+}
+
int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
{
struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
@@ -399,6 +433,7 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
mutex_lock(&ioapic->lock);
memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
+ update_handled_vectors(ioapic);
mutex_unlock(&ioapic->lock);
return 0;
}
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index 419c43b667ab..8a751b78a430 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -46,6 +46,7 @@ struct kvm_ioapic {
struct kvm *kvm;
void (*ack_notifier)(void *opaque, int irq);
struct mutex lock;
+ DECLARE_BITMAP(handled_vectors, 256);
};
#ifdef DEBUG
@@ -71,6 +72,7 @@ int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
int kvm_ioapic_init(struct kvm *kvm);
+void kvm_ioapic_destroy(struct kvm *kvm);
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
void kvm_ioapic_reset(struct kvm_ioapic *ioapic);
int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 15147583abd1..80fd3ad3b2de 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -32,10 +32,10 @@ static int kvm_iommu_unmap_memslots(struct kvm *kvm);
static void kvm_iommu_put_pages(struct kvm *kvm,
gfn_t base_gfn, unsigned long npages);
-int kvm_iommu_map_pages(struct kvm *kvm,
- gfn_t base_gfn, unsigned long npages)
+int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
{
- gfn_t gfn = base_gfn;
+ gfn_t gfn = slot->base_gfn;
+ unsigned long npages = slot->npages;
pfn_t pfn;
int i, r = 0;
struct iommu_domain *domain = kvm->arch.iommu_domain;
@@ -54,7 +54,7 @@ int kvm_iommu_map_pages(struct kvm *kvm,
if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn)))
continue;
- pfn = gfn_to_pfn(kvm, gfn);
+ pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
r = iommu_map_range(domain,
gfn_to_gpa(gfn),
pfn_to_hpa(pfn),
@@ -69,17 +69,19 @@ int kvm_iommu_map_pages(struct kvm *kvm,
return 0;
unmap_pages:
- kvm_iommu_put_pages(kvm, base_gfn, i);
+ kvm_iommu_put_pages(kvm, slot->base_gfn, i);
return r;
}
static int kvm_iommu_map_memslots(struct kvm *kvm)
{
int i, r = 0;
+ struct kvm_memslots *slots;
+
+ slots = rcu_dereference(kvm->memslots);
- for (i = 0; i < kvm->nmemslots; i++) {
- r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
- kvm->memslots[i].npages);
+ for (i = 0; i < slots->nmemslots; i++) {
+ r = kvm_iommu_map_pages(kvm, &slots->memslots[i]);
if (r)
break;
}
@@ -104,7 +106,8 @@ int kvm_assign_device(struct kvm *kvm,
r = iommu_attach_device(domain, &pdev->dev);
if (r) {
- printk(KERN_ERR "assign device %x:%x.%x failed",
+ printk(KERN_ERR "assign device %x:%x:%x.%x failed",
+ pci_domain_nr(pdev->bus),
pdev->bus->number,
PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn));
@@ -125,7 +128,8 @@ int kvm_assign_device(struct kvm *kvm,
goto out_unmap;
}
- printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n",
+ printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
+ assigned_dev->host_segnr,
assigned_dev->host_busnr,
PCI_SLOT(assigned_dev->host_devfn),
PCI_FUNC(assigned_dev->host_devfn));
@@ -152,7 +156,8 @@ int kvm_deassign_device(struct kvm *kvm,
iommu_detach_device(domain, &pdev->dev);
- printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n",
+ printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
+ assigned_dev->host_segnr,
assigned_dev->host_busnr,
PCI_SLOT(assigned_dev->host_devfn),
PCI_FUNC(assigned_dev->host_devfn));
@@ -210,10 +215,13 @@ static void kvm_iommu_put_pages(struct kvm *kvm,
static int kvm_iommu_unmap_memslots(struct kvm *kvm)
{
int i;
+ struct kvm_memslots *slots;
+
+ slots = rcu_dereference(kvm->memslots);
- for (i = 0; i < kvm->nmemslots; i++) {
- kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
- kvm->memslots[i].npages);
+ for (i = 0; i < slots->nmemslots; i++) {
+ kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn,
+ slots->memslots[i].npages);
}
return 0;
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 9fd5b3ebc517..a0e88809e45e 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -20,6 +20,7 @@
*/
#include <linux/kvm_host.h>
+#include <linux/slab.h>
#include <trace/events/kvm.h>
#include <asm/msidef.h>
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a944be392d6e..c82ae2492634 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -22,7 +22,6 @@
#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>
@@ -44,6 +43,9 @@
#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>
@@ -51,9 +53,7 @@
#include <asm/pgtable.h>
#include <asm-generic/bitops/le.h>
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
#include "coalesced_mmio.h"
-#endif
#define CREATE_TRACE_POINTS
#include <trace/events/kvm.h>
@@ -86,6 +86,8 @@ static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
static int hardware_enable_all(void);
static void hardware_disable_all(void);
+static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
+
static bool kvm_rebooting;
static bool largepages_enabled = true;
@@ -136,7 +138,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
zalloc_cpumask_var(&cpus, GFP_ATOMIC);
- spin_lock(&kvm->requests_lock);
+ 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))
@@ -151,7 +153,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
smp_call_function_many(cpus, ack_flush, NULL, 1);
else
called = false;
- spin_unlock(&kvm->requests_lock);
+ raw_spin_unlock(&kvm->requests_lock);
free_cpumask_var(cpus);
return called;
}
@@ -215,7 +217,7 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
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
@@ -235,10 +237,12 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
* 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)
@@ -252,11 +256,14 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
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,
@@ -265,8 +272,9 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
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
@@ -277,6 +285,7 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
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)
@@ -314,11 +323,13 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
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);
@@ -330,7 +341,11 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
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 = {
@@ -341,15 +356,26 @@ static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
.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;
+ 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;
@@ -363,39 +389,35 @@ static struct kvm *kvm_create_vm(void)
INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
#endif
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
- page = alloc_page(GFP_KERNEL | __GFP_ZERO);
- if (!page) {
- r = -ENOMEM;
+ r = -ENOMEM;
+ kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
+ if (!kvm->memslots)
goto out_err;
- }
- kvm->coalesced_mmio_ring =
- (struct kvm_coalesced_mmio_ring *)page_address(page);
-#endif
-
-#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
- {
- kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
- r = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
- if (r) {
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
- put_page(page);
-#endif
+ 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);
- spin_lock_init(&kvm->requests_lock);
- kvm_io_bus_init(&kvm->pio_bus);
+ raw_spin_lock_init(&kvm->requests_lock);
kvm_eventfd_init(kvm);
mutex_init(&kvm->lock);
mutex_init(&kvm->irq_lock);
- kvm_io_bus_init(&kvm->mmio_bus);
- init_rwsem(&kvm->slots_lock);
+ mutex_init(&kvm->slots_lock);
atomic_set(&kvm->users_count, 1);
spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
@@ -406,12 +428,12 @@ static struct kvm *kvm_create_vm(void)
out:
return kvm;
-#if defined(KVM_COALESCED_MMIO_PAGE_OFFSET) || \
- (defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER))
out_err:
hardware_disable_all();
-#endif
out_err_nodisable:
+ for (i = 0; i < KVM_NR_BUSES; i++)
+ kfree(kvm->buses[i]);
+ kfree(kvm->memslots);
kfree(kvm);
return ERR_PTR(r);
}
@@ -446,13 +468,17 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
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);
@@ -460,12 +486,9 @@ static void kvm_destroy_vm(struct kvm *kvm)
list_del(&kvm->vm_list);
spin_unlock(&kvm_lock);
kvm_free_irq_routing(kvm);
- 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
+ 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
@@ -512,12 +535,13 @@ int __kvm_set_memory_region(struct kvm *kvm,
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 */
@@ -532,7 +556,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
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;
@@ -553,7 +577,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
/* 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 || !s->npages)
continue;
@@ -579,15 +603,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
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)
goto skip_lpage;
@@ -636,14 +652,15 @@ 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)
- kvm_arch_flush_shadow(kvm);
+ flush_shadow = 1;
}
#else /* not defined CONFIG_S390 */
new.user_alloc = user_alloc;
@@ -651,36 +668,72 @@ skip_lpage:
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 */
- spin_lock(&kvm->mmu_lock);
- if (!npages)
- *memslot = old;
- spin_unlock(&kvm->mmu_lock);
#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:
@@ -697,9 +750,9 @@ int kvm_set_memory_region(struct kvm *kvm,
{
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);
@@ -719,19 +772,19 @@ int kvm_get_dirty_log(struct kvm *kvm,
{
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];
@@ -780,9 +833,10 @@ EXPORT_SYMBOL_GPL(kvm_is_error_hva);
struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
{
int i;
+ struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
- 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)
@@ -801,10 +855,14 @@ struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
{
int i;
+ struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
- 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)
@@ -814,33 +872,68 @@ int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
}
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(&current->mm->mmap_sem);
+ vma = find_vma(current->mm, addr);
+ if (!vma)
+ goto out;
+
+ size = vma_kernel_pagesize(vma);
+
+out:
+ up_read(&current->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;
+}
+
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);
}
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)) {
@@ -865,8 +958,32 @@ pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
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);
+static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
+{
+ return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
+}
+
+pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
+ struct kvm_memory_slot *slot, gfn_t gfn)
+{
+ 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;
@@ -1073,10 +1190,13 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
memslot = gfn_to_memslot_unaliased(kvm, gfn);
if (memslot && memslot->dirty_bitmap) {
unsigned long rel_gfn = gfn - memslot->base_gfn;
+ unsigned long *p = memslot->dirty_bitmap +
+ rel_gfn / BITS_PER_LONG;
+ int offset = rel_gfn % BITS_PER_LONG;
/* avoid RMW */
- if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap))
- generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
+ if (!generic_test_le_bit(offset, p))
+ generic___set_le_bit(offset, p);
}
}
@@ -1854,12 +1974,7 @@ static struct notifier_block kvm_reboot_notifier = {
.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;
@@ -1868,13 +1983,15 @@ void kvm_io_bus_destroy(struct kvm_io_bus *bus)
kvm_iodevice_destructor(pos);
}
+ kfree(bus);
}
/* kvm_io_bus_write - called under kvm->slots_lock */
-int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr,
+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;
@@ -1882,59 +1999,71 @@ int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr,
}
/* kvm_io_bus_read - called under kvm->slots_lock */
-int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val)
+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]);
+
for (i = 0; i < bus->dev_count; i++)
if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
return 0;
return -EOPNOTSUPP;
}
-int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
- struct kvm_io_device *dev)
+/* Caller must hold slots_lock. */
+int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
+ struct kvm_io_device *dev)
{
- int ret;
-
- down_write(&kvm->slots_lock);
- ret = __kvm_io_bus_register_dev(bus, dev);
- up_write(&kvm->slots_lock);
+ struct kvm_io_bus *new_bus, *bus;
- return ret;
-}
-
-/* An unlocked version. Caller must have write lock on slots_lock. */
-int __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
- struct kvm_io_device *dev)
-{
+ bus = kvm->buses[bus_idx];
if (bus->dev_count > NR_IOBUS_DEVS-1)
return -ENOSPC;
- bus->devs[bus->dev_count++] = dev;
+ 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_unregister_dev(struct kvm *kvm,
- 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)
{
- down_write(&kvm->slots_lock);
- __kvm_io_bus_unregister_dev(bus, dev);
- up_write(&kvm->slots_lock);
-}
+ int i, r;
+ struct kvm_io_bus *new_bus, *bus;
-/* An unlocked version. Caller must have write lock on slots_lock. */
-void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus,
- struct kvm_io_device *dev)
-{
- int i;
+ new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
+ if (!new_bus)
+ return -ENOMEM;
- for (i = 0; i < bus->dev_count; i++)
- if (bus->devs[i] == dev) {
- bus->devs[i] = bus->devs[--bus->dev_count];
+ 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;
+ }
+
+ 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 = {
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 22:49:53 +0000