Previous refactoring of the guest PCI address reservation/allocation
code allowed for slot types other than basic PCI (e.g. PCI express,
non-hotpluggable slots, etc) but would not auto-allocate a slot for a
device that required any type other than a basic hot-pluggable
PCI slot.
This patch refactors the code to be aware of different slot types
during auto-allocation of addresses as well - as long as there is an
empty slot of the required type, it will be found and used.
The piece that *wasn't* added is that we don't auto-create a new PCI
bus when needed for anything except basic PCI devices. This is because
there are multiple different types of controllers that can provide,
for example, a PCI express slot (in addition to the pcie-root
controller, these can also be found on a "root-port" or on a
"downstream-switch-port"). Since we currently don't support any PCIe
devices (except pending support for dmi-to-pci-bridge), we can defer
any decision on what to do about this.
---
src/qemu/qemu_command.c | 112 ++++++++++++++++++++++++++++++++++++++----------
1 file changed, 90 insertions(+), 22 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index abc973a..cafc4bf 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1429,6 +1429,7 @@ struct _qemuDomainPCIAddressSet {
qemuDomainPCIAddressBus *buses;
size_t nbuses;
virDevicePCIAddress lastaddr;
+ qemuDomainPCIConnectFlags lastFlags;
bool dryRun; /* on a dry run, new buses are auto-added
and addresses aren't saved in device infos */
};
@@ -1630,7 +1631,7 @@ qemuCollectPCIAddress(virDomainDefPtr def ATTRIBUTE_UNUSED,
int ret = -1;
virDevicePCIAddressPtr addr = &info->addr.pci;
bool entireSlot;
- /* FIXME: flags should be set according to the requirements of @device */
+ /* flags may be changed from default below */
qemuDomainPCIConnectFlags flags = (QEMU_PCI_CONNECT_HOTPLUGGABLE |
QEMU_PCI_CONNECT_TYPE_PCI);
@@ -1644,28 +1645,60 @@ qemuCollectPCIAddress(virDomainDefPtr def ATTRIBUTE_UNUSED,
return 0;
}
+ /* Change flags according to differing requirements of different
+ * devices.
+ */
+ if (device->type == VIR_DOMAIN_DEVICE_CONTROLLER &&
+ device->data.controller->type == VIR_DOMAIN_CONTROLLER_TYPE_PCI) {
+ switch (device->data.controller->model) {
+ case VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE:
+ /* pci-bridge needs a PCI slot, but it isn't
+ * hot-pluggable, so it doesn't need a hot-pluggable slot.
+ */
+ flags = QEMU_PCI_CONNECT_TYPE_PCI;
+ break;
+ default:
+ break;
+ }
+ }
+
/* Ignore implicit controllers on slot 0:0:1.0:
* implicit IDE controller on 0:0:1.1 (no qemu command line)
* implicit USB controller on 0:0:1.2 (-usb)
*
* If the machine does have a PCI bus, they will get reserved
* in qemuAssignDevicePCISlots().
- *
- * FIXME: When we have support for a pcie-root controller at bus
- * 0, we will no longer be able to skip checking of these devices,
- * as they are PCI, and thus can't be connected to bus 0 if it is
- * PCIe rather than PCI.
+ */
+
+ /* These are the IDE and USB controllers in the PIIX3, hardcoded
+ * to bus 0 slot 1. They cannot be attached to a PCIe slot, only
+ * PCI.
*/
if (device->type == VIR_DOMAIN_DEVICE_CONTROLLER && addr->domain == 0 &&
addr->bus == 0 && addr->slot == 1) {
virDomainControllerDefPtr cont = device->data.controller;
- if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_IDE && cont->idx == 0 &&
- addr->function == 1)
- return 0;
- if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_USB && cont->idx == 0 &&
- (cont->model == VIR_DOMAIN_CONTROLLER_MODEL_USB_PIIX3_UHCI ||
- cont->model == -1) && addr->function == 2)
- return 0;
+
+ if ((cont->type == VIR_DOMAIN_CONTROLLER_TYPE_IDE && cont->idx == 0 &&
+ addr->function == 1) ||
+ (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_USB && cont->idx == 0 &&
+ (cont->model == VIR_DOMAIN_CONTROLLER_MODEL_USB_PIIX3_UHCI ||
+ cont->model == -1) && addr->function == 2)) {
+ /* Note the check for nbuses > 0 - if there are no PCI
+ * buses, we skip this check. This is a quirk required for
+ * some machinetypes such as s390, which pretend to have a
+ * PCI bus for long enough to generate the "-usb" on the
+ * commandline, but that don't really care if a PCI bus
+ * actually exists. */
+ if (addrs->nbuses > 0 &&
+ !(addrs->buses[0].flags & QEMU_PCI_CONNECT_TYPE_PCI)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Bus 0 must be PCI for integrated PIIX3 "
+ "USB or IDE controllers"));
+ return -1;
+ } else {
+ return 0;
+ }
+ }
}
entireSlot = (addr->function == 0 &&
@@ -1695,8 +1728,7 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
int nbuses = 0;
size_t i;
int rv;
- qemuDomainPCIConnectFlags flags = (QEMU_PCI_CONNECT_HOTPLUGGABLE |
- QEMU_PCI_CONNECT_TYPE_PCI);
+ qemuDomainPCIConnectFlags flags = QEMU_PCI_CONNECT_TYPE_PCI;
for (i = 0; i < def->ncontrollers; i++) {
if (def->controllers[i]->type == VIR_DOMAIN_CONTROLLER_TYPE_PCI) {
@@ -1941,7 +1973,11 @@ int qemuDomainPCIAddressEnsureAddr(qemuDomainPCIAddressSetPtr addrs,
virDomainDeviceInfoPtr dev)
{
int ret = 0;
- /* FIXME: flags should be set according to the particular device */
+ /* Flags should be set according to the particular device,
+ * but only the caller knows the type of device. Currently this
+ * function is only used for hot-plug, though, and hot-plug is
+ * only supported for standard PCI devices, so we can safely use
+ * the setting below */
qemuDomainPCIConnectFlags flags = (QEMU_PCI_CONNECT_HOTPLUGGABLE |
QEMU_PCI_CONNECT_TYPE_PCI);
@@ -2005,7 +2041,13 @@ qemuDomainPCIAddressGetNextSlot(qemuDomainPCIAddressSetPtr addrs,
virDevicePCIAddressPtr next_addr,
qemuDomainPCIConnectFlags flags)
{
- virDevicePCIAddress a = addrs->lastaddr;
+ virDevicePCIAddress a = { 0, 0, 0, 0, false };
+
+ /* Avoid re-scanning from start if we're searching for exactly the
+ * same type of slot as last time.
+ */
+ if (flags == addrs->lastFlags)
+ a = addrs->lastaddr;
if (addrs->nbuses == 0) {
virReportError(VIR_ERR_XML_ERROR, "%s", _("No PCI buses available"));
@@ -2014,6 +2056,12 @@ qemuDomainPCIAddressGetNextSlot(qemuDomainPCIAddressSetPtr addrs,
/* Start the search at the last used bus and slot */
for (a.slot++; a.bus < addrs->nbuses; a.bus++) {
+ if (!qemuDomainPCIAddressFlagsCompatible(&a, addrs->buses[a.bus].flags,
+ flags, false)) {
+ VIR_DEBUG("PCI bus %.4x:%.2x is not compatible with the device",
+ a.domain, a.bus);
+ continue;
+ }
for (; a.slot <= QEMU_PCI_ADDRESS_SLOT_LAST; a.slot++) {
if (!qemuDomainPCIAddressSlotInUse(addrs, &a))
goto success;
@@ -2030,9 +2078,15 @@ qemuDomainPCIAddressGetNextSlot(qemuDomainPCIAddressSetPtr addrs,
if (qemuDomainPCIAddressSetGrow(addrs, &a, flags) < 0)
return -1;
goto success;
- } else {
+ } else if (flags == addrs->lastFlags) {
/* Check the buses from 0 up to the last used one */
for (a.bus = 0; a.bus <= addrs->lastaddr.bus; a.bus++) {
+ if (!qemuDomainPCIAddressFlagsCompatible(&a, addrs->buses[a.bus].flags,
+ flags, false)) {
+ VIR_DEBUG("PCI bus %.4x:%.2x is not compatible with the device",
+ a.domain, a.bus);
+ continue;
+ }
for (a.slot = 1; a.slot <= QEMU_PCI_ADDRESS_SLOT_LAST; a.slot++) {
if (!qemuDomainPCIAddressSlotInUse(addrs, &a))
goto success;
@@ -2072,6 +2126,7 @@ qemuDomainPCIAddressReserveNextSlot(qemuDomainPCIAddressSetPtr addrs,
}
addrs->lastaddr = addr;
+ addrs->lastFlags = flags;
return 0;
}
@@ -2285,15 +2340,26 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
goto error;
}
- flags = QEMU_PCI_CONNECT_HOTPLUGGABLE | QEMU_PCI_CONNECT_TYPE_PCI;
-
/* PCI controllers */
for (i = 0; i < def->ncontrollers; i++) {
if (def->controllers[i]->type == VIR_DOMAIN_CONTROLLER_TYPE_PCI) {
- if (def->controllers[i]->model == VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT)
- continue;
if (def->controllers[i]->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE)
continue;
+ switch (def->controllers[i]->model) {
+ case VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT:
+ /* pci-root is implicit in the machine,
+ * and needs no address */
+ continue;
+ case VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE:
+ /* pci-bridge doesn't require hot-plug
+ * (although it does provide hot-plug in its slots)
+ */
+ flags = QEMU_PCI_CONNECT_TYPE_PCI;
+ break;
+ default:
+ flags = QEMU_PCI_CONNECT_HOTPLUGGABLE | QEMU_PCI_CONNECT_TYPE_PCI;
+ break;
+ }
if (qemuDomainPCIAddressReserveNextSlot(addrs,
&def->controllers[i]->info,
flags) < 0)
@@ -2301,6 +2367,8 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
}
}
+ flags = QEMU_PCI_CONNECT_HOTPLUGGABLE | QEMU_PCI_CONNECT_TYPE_PCI;
+
for (i = 0; i < def->nfss; i++) {
if (def->fss[i]->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE)
continue;
--
1.7.11.7
--
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