For implicit controllers, we do not format user aliases on the command line so we provide a translation between the user alias and the qemu alias. However for pci-root controllers, the logic determining whether to use 'pci' or 'pci.0' depends on: * domain architecture * machine type * QEMU version (for PPC) Since we do not store the QEMU version in status XML and as of commit 5b783379 we no longer have the QEMU_CAPS_PCI_MULTIBUS capability formatted there either, we can only rely on the alias of the controller formatted there. Forbid user aliases for the implicit pci-root controllers so that we retain this information. This allows us to drop the call to virQEMUCapsHasPCIMultiBus, and fixing hotplug after daemon restart, since virQEMUCapsHasPCIMultiBus relies on qemuCaps->arch which is not filled out by reading the status XML either. Partially reverts commit 937f3195 which added the user alias -> qemu alias mapping for implicit PCI controllers. https://bugzilla.redhat.com/show_bug.cgi?id=1518148 --- While we cannot reliably map user aliases to qemu aliases in every corner case, I am not sure where to draw the line. For x86_64, HasPCIMultiBus could be fixed by using def->os.arch instead of qemuCaps->arch. So only PPC is unfixable, but this looked like the option with the least amount of exceptions. src/conf/domain_conf.c | 3 +-- src/conf/domain_conf.h | 2 ++ src/qemu/qemu_command.c | 16 +++++-------- src/qemu/qemu_domain.c | 26 +++++++++++++++++++++- .../qemuxml2argvdata/qemuxml2argv-user-aliases.xml | 4 +--- 5 files changed, 35 insertions(+), 16 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 66536653b..d3cd598c8 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -6623,7 +6623,6 @@ virDomainDeviceAddressParseXML(xmlNodePtr address, } -#define USER_ALIAS_PREFIX "ua-" #define USER_ALIAS_CHARS \ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-" @@ -6680,7 +6679,7 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr xmlopt ATTRIBUTE_UNUSED, if (!(flags & VIR_DOMAIN_DEF_PARSE_INACTIVE) || (xmlopt->config.features & VIR_DOMAIN_DEF_FEATURE_USER_ALIAS && - STRPREFIX(aliasStr, USER_ALIAS_PREFIX) && + STRPREFIX(aliasStr, VIR_DOMAIN_USER_ALIAS_PREFIX) && strspn(aliasStr, USER_ALIAS_CHARS) == strlen(aliasStr))) VIR_STEAL_PTR(info->alias, aliasStr); } diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index dabbff1c2..de34fb163 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -57,6 +57,8 @@ # include "virtypedparam.h" # include "virsavecookie.h" +# define VIR_DOMAIN_USER_ALIAS_PREFIX "ua-" + /* forward declarations of all device types, required by * virDomainDeviceDef */ diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 0eb591253..89e8b5350 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -321,16 +321,12 @@ qemuBuildDeviceAddressStr(virBufferPtr buf, contIsPHB = virDomainControllerIsPSeriesPHB(cont); contTargetIndex = cont->opts.pciopts.targetIndex; - /* When domain has builtin pci-root controller we don't put it - * onto cmd line. Therefore we can't set its alias. In that - * case, use the default one. */ - if (!qemuDomainIsPSeries(domainDef) && - cont->model == VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT) { - if (virQEMUCapsHasPCIMultiBus(qemuCaps, domainDef)) - contAlias = "pci.0"; - else - contAlias = "pci"; - } else if (cont->model == VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT) { + /* The builtin pcie-root controller is not put on the command line. + * We cannot set a user alias, but we can reliably predict the one + * qemu will use. + * For builtin pci-root controllers we cannot do that once a domain + * is started, but user aliases are forbidden for those. */ + if (cont->model == VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT) { contAlias = "pcie.0"; } else { contAlias = cont->info.alias; diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 9dab6b24b..ec33f3bad 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -3718,6 +3718,27 @@ qemuDomainDeviceDefValidateDisk(const virDomainDiskDef *disk) static int +qemuDomainDeviceDefValidateController(const virDomainControllerDef *controller, + const virDomainDef *def) +{ + /* Forbid user aliases for implicit controllers where + * the qemu's device alias depends on the version and therefore + * we cannot figure it out for an already running domain. */ + if (controller->model == VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT && + !qemuDomainIsPSeries(def) && + controller->info.alias && + STRPREFIX(controller->info.alias, VIR_DOMAIN_USER_ALIAS_PREFIX)) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("user aliases are not available for " + "implicit pci-root controller")); + return -1; + } + + return 0; +} + + +static int qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev, const virDomainDef *def, void *opaque ATTRIBUTE_UNUSED) @@ -3761,11 +3782,14 @@ qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev, ret = qemuDomainDeviceDefValidateDisk(dev->data.disk); break; + case VIR_DOMAIN_DEVICE_CONTROLLER: + ret = qemuDomainDeviceDefValidateController(dev->data.controller, def); + break; + case VIR_DOMAIN_DEVICE_LEASE: case VIR_DOMAIN_DEVICE_FS: case VIR_DOMAIN_DEVICE_INPUT: case VIR_DOMAIN_DEVICE_SOUND: - case VIR_DOMAIN_DEVICE_CONTROLLER: case VIR_DOMAIN_DEVICE_GRAPHICS: case VIR_DOMAIN_DEVICE_HUB: case VIR_DOMAIN_DEVICE_MEMBALLOON: diff --git a/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.xml b/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.xml index c760098fe..d1cb8fea6 100644 --- a/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.xml +++ b/tests/qemuxml2argvdata/qemuxml2argv-user-aliases.xml @@ -74,9 +74,7 @@ <alias name='ua-SomeWeirdController'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> - <controller type='pci' index='0' model='pci-root'> - <alias name='ua-MyPCIRootController'/> - </controller> + <controller type='pci' index='0' model='pci-root'/> <controller type='ide' index='0'> <alias name='ua-DoesAnybodyStillUseIDE'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> -- 2.13.6