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KVM: Use pci_store/load_saved_state() around VM device usage 

Store the device saved state so that we can reload the device back
to the original state when it's unassigned.  This has the benefit
that the state survives across pci_reset_function() calls via
the PCI sysfs reset interface while the VM is using the device.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Alex Williamson 2011-05-10 10:02:39 -06:00 committed by Jesse Barnes
parent ffbdd3f793
commit f8fcfd7755
2 changed files with 15 additions and 4 deletions
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1
include/linux/kvm_host.h
View File

@ -513,6 +513,7 @@ struct kvm_assigned_dev_kernel {
struct kvm *kvm;
spinlock_t intx_lock;
char irq_name[32];
struct pci_saved_state *pci_saved_state;
};
struct kvm_irq_mask_notifier {

18
virt/kvm/assigned-dev.c
View File

@ -197,8 +197,13 @@ static void kvm_free_assigned_device(struct kvm *kvm,
{
kvm_free_assigned_irq(kvm, assigned_dev);
__pci_reset_function(assigned_dev->dev);
pci_restore_state(assigned_dev->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_release_regions(assigned_dev->dev);
pci_disable_device(assigned_dev->dev);
@ -516,7 +521,10 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
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));
match->assigned_dev_id = assigned_dev->assigned_dev_id;
match->host_segnr = assigned_dev->segnr;
match->host_busnr = assigned_dev->busnr;
@ -546,7 +554,9 @@ out:
mutex_unlock(&kvm->lock);
return r;
out_list_del:
pci_restore_state(dev);
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: