Skip to content

Commit

Permalink
hw/virtio-pci: fix virtio behaviour
Browse files Browse the repository at this point in the history 
Enable transitional virtio devices by default.
Enable virtio-1.0 for devices plugged into
PCIe ports (Root ports or Downstream ports).

Using the virtio-1 mode will remove the limitation
of the number of devices that can be attached to a machine
by removing the need for the IO BAR.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
  • Loading branch information
@marcel-apf @mstsirkin
marcel-apf authored and mstsirkin committed Jul 28, 2016
1 parent be0d976 commit 9a4c0e2
Show file tree
Hide file tree
Showing 5 changed files with 45 additions and 26 deletions.
4 changes: 1 addition & 3 deletions hw/display/virtio-gpu-pci.c
View file
Expand Up @@ -30,9 +30,7 @@ static void virtio_gpu_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
int i;

qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
/* force virtio-1.0 */
vpci_dev->flags &= ~VIRTIO_PCI_FLAG_DISABLE_MODERN;
vpci_dev->flags |= VIRTIO_PCI_FLAG_DISABLE_LEGACY;
virtio_pci_force_virtio_1(vpci_dev);
object_property_set_bool(OBJECT(vdev), true, "realized", errp);

for (i = 0; i < g->conf.max_outputs; i++) {
Expand Down
4 changes: 1 addition & 3 deletions hw/display/virtio-vga.c
View file
Expand Up @@ -134,9 +134,7 @@ static void virtio_vga_realize(VirtIOPCIProxy *vpci_dev, Error **errp)

/* init virtio bits */
qdev_set_parent_bus(DEVICE(g), BUS(&vpci_dev->bus));
/* force virtio-1.0 */
vpci_dev->flags &= ~VIRTIO_PCI_FLAG_DISABLE_MODERN;
vpci_dev->flags |= VIRTIO_PCI_FLAG_DISABLE_LEGACY;
virtio_pci_force_virtio_1(vpci_dev);
object_property_set_bool(OBJECT(g), true, "realized", &err);
if (err) {
error_propagate(errp, err);
Expand Down
34 changes: 18 additions & 16 deletions hw/virtio/virtio-pci.c
View file
Expand Up @@ -161,7 +161,7 @@ static bool virtio_pci_modern_state_needed(void *opaque)
{
VirtIOPCIProxy *proxy = opaque;

return !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN);
return virtio_pci_modern(proxy);
}

static const VMStateDescription vmstate_virtio_pci_modern_state = {
Expand Down Expand Up @@ -300,8 +300,8 @@ static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier,
VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtQueue *vq = virtio_get_queue(vdev, n);
bool legacy = !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_LEGACY);
bool modern = !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN);
bool legacy = virtio_pci_legacy(proxy);
bool modern = virtio_pci_modern(proxy);
bool fast_mmio = kvm_ioeventfd_any_length_enabled();
bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
MemoryRegion *modern_mr = &proxy->notify.mr;
Expand Down Expand Up @@ -1574,8 +1574,8 @@ static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
{
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
VirtioBusState *bus = &proxy->bus;
bool legacy = !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_LEGACY);
bool modern = !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN);
bool legacy = virtio_pci_legacy(proxy);
bool modern = virtio_pci_modern(proxy);
bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
uint8_t *config;
uint32_t size;
Expand Down Expand Up @@ -1694,7 +1694,7 @@ static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
static void virtio_pci_device_unplugged(DeviceState *d)
{
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
bool modern = !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN);
bool modern = virtio_pci_modern(proxy);
bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;

virtio_pci_stop_ioeventfd(proxy);
Expand All @@ -1714,6 +1714,8 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
{
VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
bool pcie_port = pci_bus_is_express(pci_dev->bus) &&
!pci_bus_is_root(pci_dev->bus);

/*
* virtio pci bar layout used by default.
Expand Down Expand Up @@ -1764,8 +1766,11 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)

address_space_init(&proxy->modern_as, &proxy->modern_cfg, "virtio-pci-cfg-as");

if (pci_is_express(pci_dev) && pci_bus_is_express(pci_dev->bus) &&
!pci_bus_is_root(pci_dev->bus)) {
if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
}

if (pcie_port && pci_is_express(pci_dev)) {
int pos;

pos = pcie_endpoint_cap_init(pci_dev, 0);
Expand Down Expand Up @@ -1819,10 +1824,9 @@ static void virtio_pci_reset(DeviceState *qdev)
static Property virtio_pci_properties[] = {
DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false),
DEFINE_PROP_BIT("disable-legacy", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_DISABLE_LEGACY_BIT, false),
DEFINE_PROP_BIT("disable-modern", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_DISABLE_MODERN_BIT, true),
DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy,
ON_OFF_AUTO_AUTO),
DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false),
DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true),
DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags,
Expand All @@ -1839,7 +1843,7 @@ static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
PCIDevice *pci_dev = &proxy->pci_dev;

if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN)) {
virtio_pci_modern(proxy)) {
pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
}

Expand Down Expand Up @@ -2301,9 +2305,7 @@ static void virtio_input_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
DeviceState *vdev = DEVICE(&vinput->vdev);

qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
/* force virtio-1.0 */
vpci_dev->flags &= ~VIRTIO_PCI_FLAG_DISABLE_MODERN;
vpci_dev->flags |= VIRTIO_PCI_FLAG_DISABLE_LEGACY;
virtio_pci_force_virtio_1(vpci_dev);
object_property_set_bool(OBJECT(vdev), true, "realized", errp);
}

Expand Down
21 changes: 17 additions & 4 deletions hw/virtio/virtio-pci.h
View file
Expand Up @@ -61,8 +61,6 @@ typedef struct VirtioBusClass VirtioPCIBusClass;
enum {
VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT,
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT,
VIRTIO_PCI_FLAG_DISABLE_LEGACY_BIT,
VIRTIO_PCI_FLAG_DISABLE_MODERN_BIT,
VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT,
VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT,
VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT,
Expand All @@ -77,8 +75,6 @@ enum {
#define VIRTIO_PCI_FLAG_USE_IOEVENTFD (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT)

/* virtio version flags */
#define VIRTIO_PCI_FLAG_DISABLE_LEGACY (1 << VIRTIO_PCI_FLAG_DISABLE_LEGACY_BIT)
#define VIRTIO_PCI_FLAG_DISABLE_MODERN (1 << VIRTIO_PCI_FLAG_DISABLE_MODERN_BIT)
#define VIRTIO_PCI_FLAG_DISABLE_PCIE (1 << VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT)

/* migrate extra state */
Expand Down Expand Up @@ -144,6 +140,8 @@ struct VirtIOPCIProxy {
uint32_t modern_mem_bar;
int config_cap;
uint32_t flags;
bool disable_modern;
OnOffAuto disable_legacy;
uint32_t class_code;
uint32_t nvectors;
uint32_t dfselect;
Expand All @@ -158,6 +156,21 @@ struct VirtIOPCIProxy {
VirtioBusState bus;
};

static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy)
{
return !proxy->disable_modern;
}

static inline bool virtio_pci_legacy(VirtIOPCIProxy *proxy)
{
return proxy->disable_legacy == ON_OFF_AUTO_OFF;
}

static inline void virtio_pci_force_virtio_1(VirtIOPCIProxy *proxy)
{
proxy->disable_modern = false;
proxy->disable_legacy = ON_OFF_AUTO_ON;
}

/*
* virtio-scsi-pci: This extends VirtioPCIProxy.
Expand Down
8 changes: 8 additions & 0 deletions include/hw/compat.h
View file
Expand Up @@ -6,6 +6,14 @@
.driver = "virtio-mmio",\
.property = "format_transport_address",\
.value = "off",\
},{\
.driver = "virtio-pci",\
.property = "disable-modern",\
.value = "on",\
},{\
.driver = "virtio-pci",\
.property = "disable-legacy",\
.value = "off",\
},

#define HW_COMPAT_2_5 \
Expand Down

0 comments on commit 9a4c0e2

Please sign in to comment.