/* the host supports the ePAPR idle hcall
#define KVM_PPC_PVINFO_FLAGS_EV_IDLE (1<<0)
-4.48 KVM_ASSIGN_PCI_DEVICE (deprecated)
-
-Capability: none
-Architectures: x86
-Type: vm ioctl
-Parameters: struct kvm_assigned_pci_dev (in)
-Returns: 0 on success, -1 on error
-
-Assigns a host PCI device to the VM.
-
-struct kvm_assigned_pci_dev {
- __u32 assigned_dev_id;
- __u32 busnr;
- __u32 devfn;
- __u32 flags;
- __u32 segnr;
- union {
- __u32 reserved[11];
- };
-};
-
-The PCI device is specified by the triple segnr, busnr, and devfn.
-Identification in succeeding service requests is done via assigned_dev_id. The
-following flags are specified:
-
-/* Depends on KVM_CAP_IOMMU */
-#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
-/* The following two depend on KVM_CAP_PCI_2_3 */
-#define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)
-#define KVM_DEV_ASSIGN_MASK_INTX (1 << 2)
-
-If KVM_DEV_ASSIGN_PCI_2_3 is set, the kernel will manage legacy INTx interrupts
-via the PCI-2.3-compliant device-level mask, thus enable IRQ sharing with other
-assigned devices or host devices. KVM_DEV_ASSIGN_MASK_INTX specifies the
-guest's view on the INTx mask, see KVM_ASSIGN_SET_INTX_MASK for details.
-
-The KVM_DEV_ASSIGN_ENABLE_IOMMU flag is a mandatory option to ensure
-isolation of the device. Usages not specifying this flag are deprecated.
-
-Only PCI header type 0 devices with PCI BAR resources are supported by
-device assignment. The user requesting this ioctl must have read/write
-access to the PCI sysfs resource files associated with the device.
-
-Errors:
- ENOTTY: kernel does not support this ioctl
-
- Other error conditions may be defined by individual device types or
- have their standard meanings.
-
-
-4.49 KVM_DEASSIGN_PCI_DEVICE (deprecated)
-
-Capability: none
-Architectures: x86
-Type: vm ioctl
-Parameters: struct kvm_assigned_pci_dev (in)
-Returns: 0 on success, -1 on error
-
-Ends PCI device assignment, releasing all associated resources.
-
-See KVM_ASSIGN_PCI_DEVICE for the data structure. Only assigned_dev_id is
-used in kvm_assigned_pci_dev to identify the device.
-
-Errors:
- ENOTTY: kernel does not support this ioctl
-
- Other error conditions may be defined by individual device types or
- have their standard meanings.
-
-4.50 KVM_ASSIGN_DEV_IRQ (deprecated)
-
-Capability: KVM_CAP_ASSIGN_DEV_IRQ
-Architectures: x86
-Type: vm ioctl
-Parameters: struct kvm_assigned_irq (in)
-Returns: 0 on success, -1 on error
-
-Assigns an IRQ to a passed-through device.
-
-struct kvm_assigned_irq {
- __u32 assigned_dev_id;
- __u32 host_irq; /* ignored (legacy field) */
- __u32 guest_irq;
- __u32 flags;
- union {
- __u32 reserved[12];
- };
-};
-
-The following flags are defined:
-
-#define KVM_DEV_IRQ_HOST_INTX (1 << 0)
-#define KVM_DEV_IRQ_HOST_MSI (1 << 1)
-#define KVM_DEV_IRQ_HOST_MSIX (1 << 2)
-
-#define KVM_DEV_IRQ_GUEST_INTX (1 << 8)
-#define KVM_DEV_IRQ_GUEST_MSI (1 << 9)
-#define KVM_DEV_IRQ_GUEST_MSIX (1 << 10)
-
-It is not valid to specify multiple types per host or guest IRQ. However, the
-IRQ type of host and guest can differ or can even be null.
-
-Errors:
- ENOTTY: kernel does not support this ioctl
-
- Other error conditions may be defined by individual device types or
- have their standard meanings.
-
-
-4.51 KVM_DEASSIGN_DEV_IRQ (deprecated)
-
-Capability: KVM_CAP_ASSIGN_DEV_IRQ
-Architectures: x86
-Type: vm ioctl
-Parameters: struct kvm_assigned_irq (in)
-Returns: 0 on success, -1 on error
-
-Ends an IRQ assignment to a passed-through device.
-
-See KVM_ASSIGN_DEV_IRQ for the data structure. The target device is specified
-by assigned_dev_id, flags must correspond to the IRQ type specified on
-KVM_ASSIGN_DEV_IRQ. Partial deassignment of host or guest IRQ is allowed.
-
-
4.52 KVM_SET_GSI_ROUTING
Capability: KVM_CAP_IRQ_ROUTING
__u32 sint;
};
-4.53 KVM_ASSIGN_SET_MSIX_NR (deprecated)
-
-Capability: none
-Architectures: x86
-Type: vm ioctl
-Parameters: struct kvm_assigned_msix_nr (in)
-Returns: 0 on success, -1 on error
-
-Set the number of MSI-X interrupts for an assigned device. The number is
-reset again by terminating the MSI-X assignment of the device via
-KVM_DEASSIGN_DEV_IRQ. Calling this service more than once at any earlier
-point will fail.
-
-struct kvm_assigned_msix_nr {
- __u32 assigned_dev_id;
- __u16 entry_nr;
- __u16 padding;
-};
-
-#define KVM_MAX_MSIX_PER_DEV 256
-
-
-4.54 KVM_ASSIGN_SET_MSIX_ENTRY (deprecated)
-
-Capability: none
-Architectures: x86
-Type: vm ioctl
-Parameters: struct kvm_assigned_msix_entry (in)
-Returns: 0 on success, -1 on error
-
-Specifies the routing of an MSI-X assigned device interrupt to a GSI. Setting
-the GSI vector to zero means disabling the interrupt.
-
-struct kvm_assigned_msix_entry {
- __u32 assigned_dev_id;
- __u32 gsi;
- __u16 entry; /* The index of entry in the MSI-X table */
- __u16 padding[3];
-};
-
-Errors:
- ENOTTY: kernel does not support this ioctl
-
- Other error conditions may be defined by individual device types or
- have their standard meanings.
-
4.55 KVM_SET_TSC_KHZ
be set to the number of set bits in the bitmap.
-4.61 KVM_ASSIGN_SET_INTX_MASK (deprecated)
-
-Capability: KVM_CAP_PCI_2_3
-Architectures: x86
-Type: vm ioctl
-Parameters: struct kvm_assigned_pci_dev (in)
-Returns: 0 on success, -1 on error
-
-Allows userspace to mask PCI INTx interrupts from the assigned device. The
-kernel will not deliver INTx interrupts to the guest between setting and
-clearing of KVM_ASSIGN_SET_INTX_MASK via this interface. This enables use of
-and emulation of PCI 2.3 INTx disable command register behavior.
-
-This may be used for both PCI 2.3 devices supporting INTx disable natively and
-older devices lacking this support. Userspace is responsible for emulating the
-read value of the INTx disable bit in the guest visible PCI command register.
-When modifying the INTx disable state, userspace should precede updating the
-physical device command register by calling this ioctl to inform the kernel of
-the new intended INTx mask state.
-
-Note that the kernel uses the device INTx disable bit to internally manage the
-device interrupt state for PCI 2.3 devices. Reads of this register may
-therefore not match the expected value. Writes should always use the guest
-intended INTx disable value rather than attempting to read-copy-update the
-current physical device state. Races between user and kernel updates to the
-INTx disable bit are handled lazily in the kernel. It's possible the device
-may generate unintended interrupts, but they will not be injected into the
-guest.
-
-See KVM_ASSIGN_DEV_IRQ for the data structure. The target device is specified
-by assigned_dev_id. In the flags field, only KVM_DEV_ASSIGN_MASK_INTX is
-evaluated.
-
-
4.62 KVM_CREATE_SPAPR_TCE
Capability: KVM_CAP_SPAPR_TCE
+++ /dev/null
-/*
- * Kernel-based Virtual Machine - device assignment support
- *
- * Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- *
- */
-
-#include <linux/kvm_host.h>
-#include <linux/kvm.h>
-#include <linux/uaccess.h>
-#include <linux/vmalloc.h>
-#include <linux/errno.h>
-#include <linux/spinlock.h>
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/namei.h>
-#include <linux/fs.h>
-#include "irq.h"
-#include "assigned-dev.h"
-#include "trace/events/kvm.h"
-
-struct kvm_assigned_dev_kernel {
- struct kvm_irq_ack_notifier ack_notifier;
- struct list_head list;
- int assigned_dev_id;
- int host_segnr;
- int host_busnr;
- int host_devfn;
- unsigned int entries_nr;
- int host_irq;
- bool host_irq_disabled;
- bool pci_2_3;
- struct msix_entry *host_msix_entries;
- int guest_irq;
- struct msix_entry *guest_msix_entries;
- unsigned long irq_requested_type;
- int irq_source_id;
- int flags;
- struct pci_dev *dev;
- struct kvm *kvm;
- spinlock_t intx_lock;
- spinlock_t intx_mask_lock;
- char irq_name[32];
- struct pci_saved_state *pci_saved_state;
-};
-
-static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
- int assigned_dev_id)
-{
- struct kvm_assigned_dev_kernel *match;
-
- list_for_each_entry(match, head, list) {
- if (match->assigned_dev_id == assigned_dev_id)
- return match;
- }
- return NULL;
-}
-
-static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
- *assigned_dev, int irq)
-{
- int i, index;
- struct msix_entry *host_msix_entries;
-
- host_msix_entries = assigned_dev->host_msix_entries;
-
- index = -1;
- for (i = 0; i < assigned_dev->entries_nr; i++)
- if (irq == host_msix_entries[i].vector) {
- index = i;
- break;
- }
- if (index < 0)
- printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
-
- return index;
-}
-
-static irqreturn_t kvm_assigned_dev_intx(int irq, void *dev_id)
-{
- struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
- int ret;
-
- spin_lock(&assigned_dev->intx_lock);
- if (pci_check_and_mask_intx(assigned_dev->dev)) {
- assigned_dev->host_irq_disabled = true;
- ret = IRQ_WAKE_THREAD;
- } else
- ret = IRQ_NONE;
- spin_unlock(&assigned_dev->intx_lock);
-
- return ret;
-}
-
-static void
-kvm_assigned_dev_raise_guest_irq(struct kvm_assigned_dev_kernel *assigned_dev,
- int vector)
-{
- if (unlikely(assigned_dev->irq_requested_type &
- KVM_DEV_IRQ_GUEST_INTX)) {
- spin_lock(&assigned_dev->intx_mask_lock);
- if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
- kvm_set_irq(assigned_dev->kvm,
- assigned_dev->irq_source_id, vector, 1,
- false);
- spin_unlock(&assigned_dev->intx_mask_lock);
- } else
- kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
- vector, 1, false);
-}
-
-static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id)
-{
- struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
-
- if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
- spin_lock_irq(&assigned_dev->intx_lock);
- disable_irq_nosync(irq);
- assigned_dev->host_irq_disabled = true;
- spin_unlock_irq(&assigned_dev->intx_lock);
- }
-
- kvm_assigned_dev_raise_guest_irq(assigned_dev,
- assigned_dev->guest_irq);
-
- return IRQ_HANDLED;
-}
-
-/*
- * Deliver an IRQ in an atomic context if we can, or return a failure,
- * user can retry in a process context.
- * Return value:
- * -EWOULDBLOCK - Can't deliver in atomic context: retry in a process context.
- * Other values - No need to retry.
- */
-static int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq,
- int level)
-{
- struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS];
- struct kvm_kernel_irq_routing_entry *e;
- int ret = -EINVAL;
- int idx;
-
- trace_kvm_set_irq(irq, level, irq_source_id);
-
- /*
- * Injection into either PIC or IOAPIC might need to scan all CPUs,
- * which would need to be retried from thread context; when same GSI
- * is connected to both PIC and IOAPIC, we'd have to report a
- * partial failure here.
- * Since there's no easy way to do this, we only support injecting MSI
- * which is limited to 1:1 GSI mapping.
- */
- idx = srcu_read_lock(&kvm->irq_srcu);
- if (kvm_irq_map_gsi(kvm, entries, irq) > 0) {
- e = &entries[0];
- ret = kvm_arch_set_irq_inatomic(e, kvm, irq_source_id,
- irq, level);
- }
- srcu_read_unlock(&kvm->irq_srcu, idx);
- return ret;
-}
-
-
-static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id)
-{
- struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
- int ret = kvm_set_irq_inatomic(assigned_dev->kvm,
- assigned_dev->irq_source_id,
- assigned_dev->guest_irq, 1);
- return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
-}
-
-static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id)
-{
- struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
-
- kvm_assigned_dev_raise_guest_irq(assigned_dev,
- assigned_dev->guest_irq);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id)
-{
- struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
- int index = find_index_from_host_irq(assigned_dev, irq);
- u32 vector;
- int ret = 0;
-
- if (index >= 0) {
- vector = assigned_dev->guest_msix_entries[index].vector;
- ret = kvm_set_irq_inatomic(assigned_dev->kvm,
- assigned_dev->irq_source_id,
- vector, 1);
- }
-
- return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
-}
-
-static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
-{
- struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
- int index = find_index_from_host_irq(assigned_dev, irq);
- u32 vector;
-
- if (index >= 0) {
- vector = assigned_dev->guest_msix_entries[index].vector;
- kvm_assigned_dev_raise_guest_irq(assigned_dev, vector);
- }
-
- 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 =
- container_of(kian, struct kvm_assigned_dev_kernel,
- ack_notifier);
-
- kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0, false);
-
- spin_lock(&dev->intx_mask_lock);
-
- if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) {
- bool reassert = false;
-
- spin_lock_irq(&dev->intx_lock);
- /*
- * The guest IRQ may be shared so this ack can come from an
- * IRQ for another guest device.
- */
- if (dev->host_irq_disabled) {
- if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3))
- enable_irq(dev->host_irq);
- else if (!pci_check_and_unmask_intx(dev->dev))
- reassert = true;
- dev->host_irq_disabled = reassert;
- }
- spin_unlock_irq(&dev->intx_lock);
-
- if (reassert)
- kvm_set_irq(dev->kvm, dev->irq_source_id,
- dev->guest_irq, 1, false);
- }
-
- spin_unlock(&dev->intx_mask_lock);
-}
-
-static void deassign_guest_irq(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *assigned_dev)
-{
- if (assigned_dev->ack_notifier.gsi != -1)
- kvm_unregister_irq_ack_notifier(kvm,
- &assigned_dev->ack_notifier);
-
- kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
- assigned_dev->guest_irq, 0, false);
-
- if (assigned_dev->irq_source_id != -1)
- kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
- assigned_dev->irq_source_id = -1;
- assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
-}
-
-/* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
-static void deassign_host_irq(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *assigned_dev)
-{
- /*
- * 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
- * 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(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,
- assigned_dev);
-
- assigned_dev->entries_nr = 0;
- kfree(assigned_dev->host_msix_entries);
- kfree(assigned_dev->guest_msix_entries);
- pci_disable_msix(assigned_dev->dev);
- } else {
- /* Deal with MSI and INTx */
- if ((assigned_dev->irq_requested_type &
- KVM_DEV_IRQ_HOST_INTX) &&
- (assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
- spin_lock_irq(&assigned_dev->intx_lock);
- pci_intx(assigned_dev->dev, false);
- spin_unlock_irq(&assigned_dev->intx_lock);
- synchronize_irq(assigned_dev->host_irq);
- } else
- disable_irq(assigned_dev->host_irq);
-
- free_irq(assigned_dev->host_irq, assigned_dev);
-
- if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
- pci_disable_msi(assigned_dev->dev);
- }
-
- assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
-}
-
-static int kvm_deassign_irq(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *assigned_dev,
- unsigned long irq_requested_type)
-{
- unsigned long guest_irq_type, host_irq_type;
-
- if (!irqchip_in_kernel(kvm))
- return -EINVAL;
- /* no irq assignment to deassign */
- if (!assigned_dev->irq_requested_type)
- return -ENXIO;
-
- host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
- guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
-
- if (host_irq_type)
- deassign_host_irq(kvm, assigned_dev);
- if (guest_irq_type)
- deassign_guest_irq(kvm, assigned_dev);
-
- return 0;
-}
-
-static void kvm_free_assigned_irq(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *assigned_dev)
-{
- kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
-}
-
-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);
- if (pci_load_and_free_saved_state(assigned_dev->dev,
- &assigned_dev->pci_saved_state))
- printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
- __func__, dev_name(&assigned_dev->dev->dev));
- else
- pci_restore_state(assigned_dev->dev);
-
- pci_clear_dev_assigned(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 kvm_assigned_dev_kernel *assigned_dev, *tmp;
-
- list_for_each_entry_safe(assigned_dev, tmp,
- &kvm->arch.assigned_dev_head, list) {
- kvm_free_assigned_device(kvm, assigned_dev);
- }
-}
-
-static int assigned_device_enable_host_intx(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev)
-{
- irq_handler_t irq_handler;
- unsigned long flags;
-
- dev->host_irq = dev->dev->irq;
-
- /*
- * We can only share the IRQ line with other host devices if we are
- * able to disable the IRQ source at device-level - independently of
- * the guest driver. Otherwise host devices may suffer from unbounded
- * IRQ latencies when the guest keeps the line asserted.
- */
- if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
- irq_handler = kvm_assigned_dev_intx;
- flags = IRQF_SHARED;
- } else {
- irq_handler = NULL;
- flags = IRQF_ONESHOT;
- }
- if (request_threaded_irq(dev->host_irq, irq_handler,
- kvm_assigned_dev_thread_intx, flags,
- dev->irq_name, dev))
- return -EIO;
-
- if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
- spin_lock_irq(&dev->intx_lock);
- pci_intx(dev->dev, true);
- spin_unlock_irq(&dev->intx_lock);
- }
- return 0;
-}
-
-static int assigned_device_enable_host_msi(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev)
-{
- int r;
-
- if (!dev->dev->msi_enabled) {
- r = pci_enable_msi(dev->dev);
- if (r)
- return r;
- }
-
- dev->host_irq = dev->dev->irq;
- if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi,
- kvm_assigned_dev_thread_msi, 0,
- dev->irq_name, dev)) {
- pci_disable_msi(dev->dev);
- return -EIO;
- }
-
- return 0;
-}
-
-static int assigned_device_enable_host_msix(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev)
-{
- int i, r = -EINVAL;
-
- /* host_msix_entries and guest_msix_entries should have been
- * initialized */
- if (dev->entries_nr == 0)
- return r;
-
- r = pci_enable_msix_exact(dev->dev,
- dev->host_msix_entries, dev->entries_nr);
- if (r)
- return r;
-
- for (i = 0; i < dev->entries_nr; i++) {
- r = request_threaded_irq(dev->host_msix_entries[i].vector,
- kvm_assigned_dev_msix,
- kvm_assigned_dev_thread_msix,
- 0, dev->irq_name, dev);
- if (r)
- goto err;
- }
-
- return 0;
-err:
- for (i -= 1; i >= 0; i--)
- free_irq(dev->host_msix_entries[i].vector, dev);
- pci_disable_msix(dev->dev);
- return r;
-}
-
-static int assigned_device_enable_guest_intx(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev,
- struct kvm_assigned_irq *irq)
-{
- dev->guest_irq = irq->guest_irq;
- dev->ack_notifier.gsi = irq->guest_irq;
- return 0;
-}
-
-static int assigned_device_enable_guest_msi(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev,
- struct kvm_assigned_irq *irq)
-{
- dev->guest_irq = irq->guest_irq;
- dev->ack_notifier.gsi = -1;
- return 0;
-}
-
-static int assigned_device_enable_guest_msix(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev,
- struct kvm_assigned_irq *irq)
-{
- dev->guest_irq = irq->guest_irq;
- dev->ack_notifier.gsi = -1;
- return 0;
-}
-
-static int assign_host_irq(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev,
- __u32 host_irq_type)
-{
- int r = -EEXIST;
-
- 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);
- break;
- case KVM_DEV_IRQ_HOST_MSI:
- r = assigned_device_enable_host_msi(kvm, dev);
- break;
- case KVM_DEV_IRQ_HOST_MSIX:
- r = assigned_device_enable_host_msix(kvm, dev);
- break;
- default:
- r = -EINVAL;
- }
- dev->host_irq_disabled = false;
-
- if (!r)
- dev->irq_requested_type |= host_irq_type;
-
- return r;
-}
-
-static int assign_guest_irq(struct kvm *kvm,
- struct kvm_assigned_dev_kernel *dev,
- struct kvm_assigned_irq *irq,
- unsigned long guest_irq_type)
-{
- int id;
- int r = -EEXIST;
-
- if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
- return r;
-
- id = kvm_request_irq_source_id(kvm);
- if (id < 0)
- return id;
-
- dev->irq_source_id = id;
-
- switch (guest_irq_type) {
- case KVM_DEV_IRQ_GUEST_INTX:
- r = assigned_device_enable_guest_intx(kvm, dev, irq);
- break;
- case KVM_DEV_IRQ_GUEST_MSI:
- r = assigned_device_enable_guest_msi(kvm, dev, irq);
- break;
- case KVM_DEV_IRQ_GUEST_MSIX:
- r = assigned_device_enable_guest_msix(kvm, dev, irq);
- break;
- default:
- r = -EINVAL;
- }
-
- if (!r) {
- dev->irq_requested_type |= guest_irq_type;
- if (dev->ack_notifier.gsi != -1)
- kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
- } else {
- kvm_free_irq_source_id(kvm, dev->irq_source_id);
- dev->irq_source_id = -1;
- }
-
- return r;
-}
-
-/* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
-static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
- struct kvm_assigned_irq *assigned_irq)
-{
- int r = -EINVAL;
- struct kvm_assigned_dev_kernel *match;
- unsigned long host_irq_type, guest_irq_type;
-
- if (!irqchip_in_kernel(kvm))
- return r;
-
- mutex_lock(&kvm->lock);
- r = -ENODEV;
- match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- assigned_irq->assigned_dev_id);
- if (!match)
- goto out;
-
- host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
- guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
-
- r = -EINVAL;
- /* can only assign one type at a time */
- if (hweight_long(host_irq_type) > 1)
- goto out;
- if (hweight_long(guest_irq_type) > 1)
- goto out;
- if (host_irq_type == 0 && guest_irq_type == 0)
- goto out;
-
- r = 0;
- if (host_irq_type)
- r = assign_host_irq(kvm, match, host_irq_type);
- if (r)
- goto out;
-
- if (guest_irq_type)
- r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
-out:
- mutex_unlock(&kvm->lock);
- return r;
-}
-
-static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
- struct kvm_assigned_irq
- *assigned_irq)
-{
- int r = -ENODEV;
- struct kvm_assigned_dev_kernel *match;
- unsigned long irq_type;
-
- mutex_lock(&kvm->lock);
-
- match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- assigned_irq->assigned_dev_id);
- if (!match)
- goto out;
-
- irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
- KVM_DEV_IRQ_GUEST_MASK);
- r = kvm_deassign_irq(kvm, match, irq_type);
-out:
- mutex_unlock(&kvm->lock);
- return r;
-}
-
-/*
- * We want to test whether the caller has been granted permissions to
- * use this device. To be able to configure and control the device,
- * the user needs access to PCI configuration space and BAR resources.
- * These are accessed through PCI sysfs. PCI config space is often
- * passed to the process calling this ioctl via file descriptor, so we
- * can't rely on access to that file. We can check for permissions
- * on each of the BAR resource files, which is a pretty clear
- * indicator that the user has been granted access to the device.
- */
-static int probe_sysfs_permissions(struct pci_dev *dev)
-{
-#ifdef CONFIG_SYSFS
- int i;
- bool bar_found = false;
-
- for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
- char *kpath, *syspath;
- struct path path;
- struct inode *inode;
- int r;
-
- if (!pci_resource_len(dev, i))
- continue;
-
- kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
- if (!kpath)
- return -ENOMEM;
-
- /* Per sysfs-rules, sysfs is always at /sys */
- syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
- kfree(kpath);
- if (!syspath)
- return -ENOMEM;
-
- r = kern_path(syspath, LOOKUP_FOLLOW, &path);
- kfree(syspath);
- if (r)
- return r;
-
- inode = d_backing_inode(path.dentry);
-
- r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
- path_put(&path);
- if (r)
- return r;
-
- bar_found = true;
- }
-
- /* If no resources, probably something special */
- if (!bar_found)
- return -EPERM;
-
- return 0;
-#else
- return -EINVAL; /* No way to control the device without sysfs */
-#endif
-}
-
-static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
- struct kvm_assigned_pci_dev *assigned_dev)
-{
- int r = 0, idx;
- struct kvm_assigned_dev_kernel *match;
- struct pci_dev *dev;
-
- if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
- return -EINVAL;
-
- mutex_lock(&kvm->lock);
- idx = srcu_read_lock(&kvm->srcu);
-
- match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- assigned_dev->assigned_dev_id);
- if (match) {
- /* device already assigned */
- r = -EEXIST;
- 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_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__);
- r = -EINVAL;
- goto out_free;
- }
-
- /* Don't allow bridges to be assigned */
- if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
- r = -EPERM;
- goto out_put;
- }
-
- r = probe_sysfs_permissions(dev);
- if (r)
- goto out_put;
-
- 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);
- pci_save_state(dev);
- match->pci_saved_state = pci_store_saved_state(dev);
- if (!match->pci_saved_state)
- printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
- __func__, dev_name(&dev->dev));
-
- if (!pci_intx_mask_supported(dev))
- assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
-
- 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;
- match->dev = dev;
- spin_lock_init(&match->intx_lock);
- spin_lock_init(&match->intx_mask_lock);
- match->irq_source_id = -1;
- match->kvm = kvm;
- match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
-
- list_add(&match->list, &kvm->arch.assigned_dev_head);
-
- if (!kvm->arch.iommu_domain) {
- r = kvm_iommu_map_guest(kvm);
- if (r)
- goto out_list_del;
- }
- r = kvm_assign_device(kvm, match->dev);
- if (r)
- goto out_list_del;
-
-out:
- srcu_read_unlock(&kvm->srcu, idx);
- mutex_unlock(&kvm->lock);
- return r;
-out_list_del:
- if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
- printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
- __func__, dev_name(&dev->dev));
- list_del(&match->list);
- pci_release_regions(dev);
-out_disable:
- pci_disable_device(dev);
-out_put:
- pci_dev_put(dev);
-out_free:
- kfree(match);
- srcu_read_unlock(&kvm->srcu, idx);
- mutex_unlock(&kvm->lock);
- return r;
-}
-
-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;
- }
-
- kvm_deassign_device(kvm, match->dev);
-
- kvm_free_assigned_device(kvm, match);
-
-out:
- mutex_unlock(&kvm->lock);
- return r;
-}
-
-
-static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
- struct kvm_assigned_msix_nr *entry_nr)
-{
- int r = 0;
- struct kvm_assigned_dev_kernel *adev;
-
- mutex_lock(&kvm->lock);
-
- adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- entry_nr->assigned_dev_id);
- if (!adev) {
- r = -EINVAL;
- goto msix_nr_out;
- }
-
- if (adev->entries_nr == 0) {
- adev->entries_nr = entry_nr->entry_nr;
- if (adev->entries_nr == 0 ||
- adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
- r = -EINVAL;
- goto msix_nr_out;
- }
-
- adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
- entry_nr->entry_nr,
- GFP_KERNEL);
- if (!adev->host_msix_entries) {
- r = -ENOMEM;
- goto msix_nr_out;
- }
- 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;
- goto msix_nr_out;
- }
- } else /* Not allowed set MSI-X number twice */
- r = -EINVAL;
-msix_nr_out:
- mutex_unlock(&kvm->lock);
- return r;
-}
-
-static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
- struct kvm_assigned_msix_entry *entry)
-{
- int r = 0, i;
- struct kvm_assigned_dev_kernel *adev;
-
- mutex_lock(&kvm->lock);
-
- adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
- entry->assigned_dev_id);
-
- if (!adev) {
- r = -EINVAL;
- goto msix_entry_out;
- }
-
- for (i = 0; i < adev->entries_nr; i++)
- if (adev->guest_msix_entries[i].vector == 0 ||
- adev->guest_msix_entries[i].entry == entry->entry) {
- adev->guest_msix_entries[i].entry = entry->entry;
- adev->guest_msix_entries[i].vector = entry->gsi;
- adev->host_msix_entries[i].entry = entry->entry;
- break;
- }
- if (i == adev->entries_nr) {
- r = -ENOSPC;
- goto msix_entry_out;
- }
-
-msix_entry_out:
- mutex_unlock(&kvm->lock);
-
- return r;
-}
-
-static int kvm_vm_ioctl_set_pci_irq_mask(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) {
- r = -ENODEV;
- goto out;
- }
-
- spin_lock(&match->intx_mask_lock);
-
- match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
- match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
-
- if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
- if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
- kvm_set_irq(match->kvm, match->irq_source_id,
- match->guest_irq, 0, false);
- /*
- * Masking at hardware-level is performed on demand,
- * i.e. when an IRQ actually arrives at the host.
- */
- } else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
- /*
- * Unmask the IRQ line if required. Unmasking at
- * device level will be performed by user space.
- */
- spin_lock_irq(&match->intx_lock);
- if (match->host_irq_disabled) {
- enable_irq(match->host_irq);
- match->host_irq_disabled = false;
- }
- spin_unlock_irq(&match->intx_lock);
- }
- }
-
- spin_unlock(&match->intx_mask_lock);
-
-out:
- mutex_unlock(&kvm->lock);
- return r;
-}
-
-long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
- unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int r;
-
- switch (ioctl) {
- case KVM_ASSIGN_PCI_DEVICE: {
- struct kvm_assigned_pci_dev assigned_dev;
-
- 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)
- goto out;
- break;
- }
- case KVM_ASSIGN_IRQ: {
- r = -EOPNOTSUPP;
- break;
- }
- case KVM_ASSIGN_DEV_IRQ: {
- struct kvm_assigned_irq assigned_irq;
-
- 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)
- goto out;
- break;
- }
- case KVM_DEASSIGN_DEV_IRQ: {
- struct kvm_assigned_irq assigned_irq;
-
- r = -EFAULT;
- if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
- goto out;
- r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
- if (r)
- goto out;
- break;
- }
- case KVM_DEASSIGN_PCI_DEVICE: {
- struct kvm_assigned_pci_dev assigned_dev;
-
- r = -EFAULT;
- if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
- goto out;
- r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
- if (r)
- goto out;
- break;
- }
- case KVM_ASSIGN_SET_MSIX_NR: {
- struct kvm_assigned_msix_nr entry_nr;
- r = -EFAULT;
- if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
- goto out;
- r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
- if (r)
- goto out;
- break;
- }
- case KVM_ASSIGN_SET_MSIX_ENTRY: {
- struct kvm_assigned_msix_entry entry;
- r = -EFAULT;
- if (copy_from_user(&entry, argp, sizeof entry))
- goto out;
- r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
- if (r)
- goto out;
- break;
- }
- case KVM_ASSIGN_SET_INTX_MASK: {
- struct kvm_assigned_pci_dev assigned_dev;
-
- r = -EFAULT;
- if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
- goto out;
- r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);
- break;
- }
- default:
- r = -ENOTTY;
- break;
- }
-out:
- return r;
-}
+++ /dev/null
-/*
- * Copyright (c) 2006, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307 USA.
- *
- * Copyright (C) 2006-2008 Intel Corporation
- * Copyright IBM Corporation, 2008
- * Copyright 2010 Red Hat, Inc. and/or its affiliates.
- *
- * Author: Allen M. Kay <allen.m.kay@intel.com>
- * Author: Weidong Han <weidong.han@intel.com>
- * Author: Ben-Ami Yassour <benami@il.ibm.com>
- */
-
-#include <linux/list.h>
-#include <linux/kvm_host.h>
-#include <linux/moduleparam.h>
-#include <linux/pci.h>
-#include <linux/stat.h>
-#include <linux/iommu.h>
-#include "assigned-dev.h"
-
-static bool allow_unsafe_assigned_interrupts;
-module_param_named(allow_unsafe_assigned_interrupts,
- allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
- "Enable device assignment on platforms without interrupt remapping support.");
-
-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);
-
-static kvm_pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
- unsigned long npages)
-{
- gfn_t end_gfn;
- kvm_pfn_t pfn;
-
- pfn = gfn_to_pfn_memslot(slot, gfn);
- end_gfn = gfn + npages;
- gfn += 1;
-
- if (is_error_noslot_pfn(pfn))
- return pfn;
-
- while (gfn < end_gfn)
- gfn_to_pfn_memslot(slot, gfn++);
-
- return pfn;
-}
-
-static void kvm_unpin_pages(struct kvm *kvm, kvm_pfn_t pfn,
- unsigned long npages)
-{
- unsigned long i;
-
- for (i = 0; i < npages; ++i)
- kvm_release_pfn_clean(pfn + i);
-}
-
-int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
-{
- gfn_t gfn, end_gfn;
- kvm_pfn_t pfn;
- int r = 0;
- struct iommu_domain *domain = kvm->arch.iommu_domain;
- int flags;
-
- /* check if iommu exists and in use */
- if (!domain)
- return 0;
-
- gfn = slot->base_gfn;
- end_gfn = gfn + slot->npages;
-
- flags = IOMMU_READ;
- if (!(slot->flags & KVM_MEM_READONLY))
- flags |= IOMMU_WRITE;
- if (!kvm->arch.iommu_noncoherent)
- flags |= IOMMU_CACHE;
-
-
- while (gfn < end_gfn) {
- unsigned long page_size;
-
- /* Check if already mapped */
- if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
- gfn += 1;
- continue;
- }
-
- /* Get the page size we could use to map */
- page_size = kvm_host_page_size(kvm, gfn);
-
- /* Make sure the page_size does not exceed the memslot */
- while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
- page_size >>= 1;
-
- /* Make sure gfn is aligned to the page size we want to map */
- while ((gfn << PAGE_SHIFT) & (page_size - 1))
- page_size >>= 1;
-
- /* Make sure hva is aligned to the page size we want to map */
- while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
- page_size >>= 1;
-
- /*
- * Pin all pages we are about to map in memory. This is
- * important because we unmap and unpin in 4kb steps later.
- */
- pfn = kvm_pin_pages(slot, gfn, page_size >> PAGE_SHIFT);
- if (is_error_noslot_pfn(pfn)) {
- gfn += 1;
- continue;
- }
-
- /* Map into IO address space */
- r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
- page_size, flags);
- if (r) {
- printk(KERN_ERR "kvm_iommu_map_address:"
- "iommu failed to map pfn=%llx\n", pfn);
- kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT);
- goto unmap_pages;
- }
-
- gfn += page_size >> PAGE_SHIFT;
-
- cond_resched();
- }
-
- return 0;
-
-unmap_pages:
- kvm_iommu_put_pages(kvm, slot->base_gfn, gfn - slot->base_gfn);
- return r;
-}
-
-static int kvm_iommu_map_memslots(struct kvm *kvm)
-{
- int idx, r = 0;
- struct kvm_memslots *slots;
- struct kvm_memory_slot *memslot;
-
- if (kvm->arch.iommu_noncoherent)
- kvm_arch_register_noncoherent_dma(kvm);
-
- idx = srcu_read_lock(&kvm->srcu);
- slots = kvm_memslots(kvm);
-
- kvm_for_each_memslot(memslot, slots) {
- r = kvm_iommu_map_pages(kvm, memslot);
- if (r)
- break;
- }
- srcu_read_unlock(&kvm->srcu, idx);
-
- return r;
-}
-
-int kvm_assign_device(struct kvm *kvm, struct pci_dev *pdev)
-{
- struct iommu_domain *domain = kvm->arch.iommu_domain;
- int r;
- bool noncoherent;
-
- /* check if iommu exists and in use */
- if (!domain)
- return 0;
-
- if (pdev == NULL)
- return -ENODEV;
-
- r = iommu_attach_device(domain, &pdev->dev);
- if (r) {
- dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
- return r;
- }
-
- noncoherent = !iommu_capable(&pci_bus_type, IOMMU_CAP_CACHE_COHERENCY);
-
- /* Check if need to update IOMMU page table for guest memory */
- if (noncoherent != kvm->arch.iommu_noncoherent) {
- kvm_iommu_unmap_memslots(kvm);
- kvm->arch.iommu_noncoherent = noncoherent;
- r = kvm_iommu_map_memslots(kvm);
- if (r)
- goto out_unmap;
- }
-
- kvm_arch_start_assignment(kvm);
- pci_set_dev_assigned(pdev);
-
- dev_info(&pdev->dev, "kvm assign device\n");
-
- return 0;
-out_unmap:
- kvm_iommu_unmap_memslots(kvm);
- return r;
-}
-
-int kvm_deassign_device(struct kvm *kvm, struct pci_dev *pdev)
-{
- struct iommu_domain *domain = kvm->arch.iommu_domain;
-
- /* check if iommu exists and in use */
- if (!domain)
- return 0;
-
- if (pdev == NULL)
- return -ENODEV;
-
- iommu_detach_device(domain, &pdev->dev);
-
- pci_clear_dev_assigned(pdev);
- kvm_arch_end_assignment(kvm);
-
- dev_info(&pdev->dev, "kvm deassign device\n");
-
- return 0;
-}
-
-int kvm_iommu_map_guest(struct kvm *kvm)
-{
- int r;
-
- if (!iommu_present(&pci_bus_type)) {
- printk(KERN_ERR "%s: iommu not found\n", __func__);
- return -ENODEV;
- }
-
- mutex_lock(&kvm->slots_lock);
-
- kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
- if (!kvm->arch.iommu_domain) {
- r = -ENOMEM;
- goto out_unlock;
- }
-
- if (!allow_unsafe_assigned_interrupts &&
- !iommu_capable(&pci_bus_type, IOMMU_CAP_INTR_REMAP)) {
- printk(KERN_WARNING "%s: No interrupt remapping support,"
- " disallowing device assignment."
- " Re-enable with \"allow_unsafe_assigned_interrupts=1\""
- " module option.\n", __func__);
- iommu_domain_free(kvm->arch.iommu_domain);
- kvm->arch.iommu_domain = NULL;
- r = -EPERM;
- goto out_unlock;
- }
-
- r = kvm_iommu_map_memslots(kvm);
- if (r)
- kvm_iommu_unmap_memslots(kvm);
-
-out_unlock:
- mutex_unlock(&kvm->slots_lock);
- return r;
-}
-
-static void kvm_iommu_put_pages(struct kvm *kvm,
- gfn_t base_gfn, unsigned long npages)
-{
- struct iommu_domain *domain;
- gfn_t end_gfn, gfn;
- kvm_pfn_t pfn;
- u64 phys;
-
- domain = kvm->arch.iommu_domain;
- end_gfn = base_gfn + npages;
- gfn = base_gfn;
-
- /* check if iommu exists and in use */
- if (!domain)
- return;
-
- while (gfn < end_gfn) {
- unsigned long unmap_pages;
- size_t size;
-
- /* Get physical address */
- phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
-
- if (!phys) {
- gfn++;
- continue;
- }
-
- pfn = phys >> PAGE_SHIFT;
-
- /* Unmap address from IO address space */
- size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
- unmap_pages = 1ULL << get_order(size);
-
- /* Unpin all pages we just unmapped to not leak any memory */
- kvm_unpin_pages(kvm, pfn, unmap_pages);
-
- gfn += unmap_pages;
-
- cond_resched();
- }
-}
-
-void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
-{
- kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
-}
-
-static int kvm_iommu_unmap_memslots(struct kvm *kvm)
-{
- int idx;
- struct kvm_memslots *slots;
- struct kvm_memory_slot *memslot;
-
- idx = srcu_read_lock(&kvm->srcu);
- slots = kvm_memslots(kvm);
-
- kvm_for_each_memslot(memslot, slots)
- kvm_iommu_unmap_pages(kvm, memslot);
-
- srcu_read_unlock(&kvm->srcu, idx);
-
- if (kvm->arch.iommu_noncoherent)
- kvm_arch_unregister_noncoherent_dma(kvm);
-
- return 0;
-}
-
-int kvm_iommu_unmap_guest(struct kvm *kvm)
-{
- struct iommu_domain *domain = kvm->arch.iommu_domain;
-
- /* check if iommu exists and in use */
- if (!domain)
- return 0;
-
- mutex_lock(&kvm->slots_lock);
- kvm_iommu_unmap_memslots(kvm);
- kvm->arch.iommu_domain = NULL;
- kvm->arch.iommu_noncoherent = false;
- mutex_unlock(&kvm->slots_lock);
-
- iommu_domain_free(domain);
- return 0;
-}
projects / karo-tx-linux.git / commitdiff