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@xxxxxxxxxx>
---
include/linux/kvm_host.h | 1 +
virt/kvm/assigned-dev.c | 18 ++++++++++++++----
2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index ab42855..9272db0 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -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 {
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index ae72ae6..6cc4b97 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -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:
--
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