From: Bernhard Kohl <bernhard.kohl@xxxxxxx>
This is necessary because during reboot of a VM the assigned devices
continue DMA transfers which causes memory corruption.
Acked-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Acked-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Thomas Ostler <thomas.ostler@xxxxxxx>
Signed-off-by: Bernhard Kohl <bernhard.kohl@xxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index c2a7b27..369bff9 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -1438,6 +1438,17 @@ static const VMStateDescription vmstate_assigned_device = {
.name = "pci-assign"
};
+static void reset_assigned_device(DeviceState *dev)
+{
+ PCIDevice *d = DO_UPCAST(PCIDevice, qdev, dev);
+
+ /*
+ * When a 0 is written to the command register, the device is logically
+ * disconnected from the PCI bus. This avoids further DMA transfers.
+ */
+ assigned_dev_pci_write_config(d, PCI_COMMAND, 0, 2);
+}
+
static int assigned_initfn(struct PCIDevice *pci_dev)
{
AssignedDevice *dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
@@ -1555,6 +1566,7 @@ static PCIDeviceInfo assign_info = {
.qdev.name = "pci-assign",
.qdev.desc = "pass through host pci devices to the guest",
.qdev.size = sizeof(AssignedDevice),
+ .qdev.reset = reset_assigned_device,
.init = assigned_initfn,
.exit = assigned_exitfn,
.config_read = assigned_dev_pci_read_config,
--
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