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

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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: