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[PATCH v3 10/10] vfio: unplug failover primary device before migration
From: |
Jens Freimann |
Subject: |
[PATCH v3 10/10] vfio: unplug failover primary device before migration |
Date: |
Fri, 11 Oct 2019 13:20:15 +0200 |
As usual block all vfio-pci devices from being migrated, but make an
exception for failover primary devices. This is achieved by setting
unmigratable to 0 but also add a migration blocker for all vfio-pci
devices except failover primary devices. These will be unplugged before
migration happens by the migration handler of the corresponding
virtio-net standby device.
Signed-off-by: Jens Freimann <address@hidden>
---
hw/vfio/pci.c | 35 ++++++++++++++++++++++++++++++++++-
hw/vfio/pci.h | 2 ++
2 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index c5e6fe61cb..64cf8e07d9 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -40,6 +40,9 @@
#include "pci.h"
#include "trace.h"
#include "qapi/error.h"
+#include "migration/blocker.h"
+#include "qemu/option.h"
+#include "qemu/option_int.h"
#define TYPE_VFIO_PCI "vfio-pci"
#define PCI_VFIO(obj) OBJECT_CHECK(VFIOPCIDevice, obj, TYPE_VFIO_PCI)
@@ -2698,6 +2701,12 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice
*vdev)
vdev->req_enabled = false;
}
+static int has_net_failover_arg(void *opaque, const char *name,
+ const char *value, Error **errp)
+{
+ return (strcmp(name, "net_failover_pair_id") == 0);
+}
+
static void vfio_realize(PCIDevice *pdev, Error **errp)
{
VFIOPCIDevice *vdev = PCI_VFIO(pdev);
@@ -2710,6 +2719,20 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
int groupid;
int i, ret;
bool is_mdev;
+ uint16_t class_id;
+
+ if (qemu_opt_foreach(pdev->qdev.opts, has_net_failover_arg,
+ (void *) pdev->qdev.opts, &err) == 0) {
+ error_setg(&vdev->migration_blocker,
+ "VFIO device doesn't support migration");
+ ret = migrate_add_blocker(vdev->migration_blocker, &err);
+ if (err) {
+ error_propagate(errp, err);
+ error_free(vdev->migration_blocker);
+ }
+ } else {
+ pdev->qdev.allow_unplug_during_migration = true;
+ }
if (!vdev->vbasedev.sysfsdev) {
if (!(~vdev->host.domain || ~vdev->host.bus ||
@@ -2812,6 +2835,14 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
goto error;
}
+ if (vdev->net_failover_pair_id != NULL) {
+ class_id = pci_get_word(pdev->config + PCI_CLASS_DEVICE);
+ if (class_id != PCI_CLASS_NETWORK_ETHERNET) {
+ error_setg(errp, "failover device is not an Ethernet device");
+ goto error;
+ }
+ }
+
/* vfio emulates a lot for us, but some bits need extra love */
vdev->emulated_config_bits = g_malloc0(vdev->config_size);
@@ -3110,6 +3141,8 @@ static Property vfio_pci_dev_properties[] = {
display, ON_OFF_AUTO_OFF),
DEFINE_PROP_UINT32("xres", VFIOPCIDevice, display_xres, 0),
DEFINE_PROP_UINT32("yres", VFIOPCIDevice, display_yres, 0),
+ DEFINE_PROP_STRING("net_failover_pair_id", VFIOPCIDevice,
+ net_failover_pair_id),
DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice,
intx.mmap_timeout, 1100),
DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features,
@@ -3152,7 +3185,7 @@ static Property vfio_pci_dev_properties[] = {
static const VMStateDescription vfio_pci_vmstate = {
.name = "vfio-pci",
- .unmigratable = 1,
+ .unmigratable = 0,
};
static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index 834a90d646..da4417071a 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -134,6 +134,7 @@ typedef struct VFIOPCIDevice {
PCIHostDeviceAddress host;
EventNotifier err_notifier;
EventNotifier req_notifier;
+ char *net_failover_pair_id;
int (*resetfn)(struct VFIOPCIDevice *);
uint32_t vendor_id;
uint32_t device_id;
@@ -168,6 +169,7 @@ typedef struct VFIOPCIDevice {
bool no_vfio_ioeventfd;
bool enable_ramfb;
VFIODisplay *dpy;
+ Error *migration_blocker;
} VFIOPCIDevice;
uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);
--
2.21.0
- [PATCH v3 07/10] migration: add new migration state wait-unplug, (continued)
[PATCH v3 08/10] libqos: tolerate wait-unplug migration state, Jens Freimann, 2019/10/11
[PATCH v3 09/10] net/virtio: add failover support, Jens Freimann, 2019/10/11
[PATCH v3 10/10] vfio: unplug failover primary device before migration,
Jens Freimann <=
Re: [PATCH v3 0/10] add failover feature for assigned network devices, Michael S. Tsirkin, 2019/10/11
Re: [PATCH v3 0/10] add failover feature for assigned network devices, no-reply, 2019/10/11
Re: [PATCH v3 0/10] add failover feature for assigned network devices, Alex Williamson, 2019/10/15