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conf: introduce support for acpi-bridge-hotplug feature

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This change introduces a new libvirt sub-element <pci> under
<features> that can be used to configure all pci related features.
Currently the only sub-sub element supported by this sub-element is
'acpi-bridge-hotplug' as shown below:

<features>
  <pci>
    <acpi-bridge-hotplug state='on|off'/>
  </pci>
</features>

The above option is only available for the QEMU driver, for x86 guests
only. It is a global option, affecting all PCI bridge controllers on
the guest.

The 'acpi-bridge-hotplug' option enables or disables ACPI hotplug
support for cold-plugged pci bridges. Examples of bridges include the
PCI-PCI bridge (pci-bridge controller) for pc (i440fx) machinetypes,
or PCIe-PCI bridges and pcie-root-port controllers for q35
machinetypes.

For pc machinetypes in x86, this option has been available in QEMU
since version 2.1. Please see the following changes in qemu repo:

9e047b982452c6 ("piix4: add acpi pci hotplug support")
133a2da488062e ("pc: acpi: generate AML only for PCI0 devices if PCI
               bridge hotplug is disabled")

For q35 machinetypes, this was introduced in QEMU 6.1 with the
following changes in qemu repo:

(a) c0e427d6eb5fef ("hw/acpi/ich9: Enable ACPI PCI hot-plug")
(b) 17858a16950860 ("hw/acpi/ich9: Set ACPI PCI hot-plug as default on
                   Q35")

The reasons for enabling ACPI based hotplug for PCIe (q35) based
machines (as opposed to native hotplug) are outlined in (b). There are
use cases where users would still want to use native
hotplug. Therefore, this config option enables users to choose either
ACPI based hotplug or native hotplug for bridges (for example for pcie
root port controller in q35 machines).

Qemu capability validation checks have also been added along with
related unit tests to exercise the new conf option.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Laine Stump <laine@redhat.com>
This commit is contained in:
Ani Sinha 2021-10-08 12:12:13 +05:30 committed by Laine Stump
parent 58ba0f6a3d
commit 7300ccc9b3
15 changed files with 398 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
docs/formatdomain.rst
View File

@ -1847,6 +1847,9 @@ Hypervisors may allow certain CPU / machine features to be toggled on/off.
<e820_host state='on'/>
<passthrough state='on' mode='share_pt'/>
</xen>
<pci>
<acpi-bridge-hotplug state="on"/>
</pci>
<pvspinlock state='on'/>
<gic version='2'/>
<ioapic driver='qemu'/>
@ -1942,6 +1945,32 @@ are:
passthrough Enable IOMMU mappings allowing PCI passthrough on, off; mode - optional string sync_pt or share_pt :since:`6.3.0`
=========== ============================================== =================================================== ==============
``pci``
Various PCI bus related features of the hypervisor.
==================== ========================================================================================================= ======= ==============
Feature Description Value Since
==================== ========================================================================================================= ======= ==============
acpi-bridge-hotplug Enable ACPI based hotplug on the cold-plugged PCI bridges (pc) and pcie-root-ports (q35) (also see notes) on, off :since:`7.9.0`
==================== ========================================================================================================= ======= ==============
Note: pc machine types (i440fx) have ACPI hotplug enabled by
default on cold plugged bridges (bridges that were present in the
VM's domain definition before it was started). Disabling ACPI
hotplug leaves only SHPC hotplug enabled; many OSes don't
support SHPC hotplug, so this may have the effect of completely
disabling hotplug.
On q35 machinetypes earlier than pc-q35-6.1 (regardless of the QEMU
binary version), ACPI hotplug for cold plugged bridges is disabled
by default, and native PCIe hotplug is enabled instead. Enabling
ACPI hotplug will disable native PCIe hotplug.
Starting with the pc-q35-6.1 machinetype, ACPI hotplug is enabled
on cold plugged bridges by default while native PCIe hotplug is
disabled. In this case, disabling ACPI hotplug will re-enable PCIe
native hotplug.
``pmu``
Depending on the ``state`` attribute (values ``on``, ``off``, default ``on``)
enable or disable the performance monitoring unit for the guest.

15
docs/schemas/domaincommon.rng
View File

@ -6169,6 +6169,9 @@
<optional>
<ref name="ioapic"/>
</optional>
<optional>
<ref name="pci"/>
</optional>
<optional>
<ref name="hpt"/>
</optional>
@ -6400,6 +6403,18 @@
</element>
</define>
<define name="pci">
<element name="pci">
<interleave>
<optional>
<element name="acpi-bridge-hotplug">
<ref name="featurestate"/>
</element>
</optional>
</interleave>
</element>
</define>
<define name="ioapic">
<element name="ioapic">
<attribute name="driver">

89
src/conf/domain_conf.c
View File

@ -172,6 +172,7 @@ VIR_ENUM_IMPL(virDomainFeature,
"cfpc",
"sbbc",
"ibs",
"pci",
);
VIR_ENUM_IMPL(virDomainCapabilitiesPolicy,
@ -212,6 +213,11 @@ VIR_ENUM_IMPL(virDomainXen,
"passthrough",
);
VIR_ENUM_IMPL(virDomainPCI,
VIR_DOMAIN_PCI_LAST,
"acpi-bridge-hotplug",
);
VIR_ENUM_IMPL(virDomainXenPassthroughMode,
VIR_DOMAIN_XEN_PASSTHROUGH_MODE_LAST,
"default",
@ -17536,6 +17542,36 @@ virDomainFeaturesKVMDefParse(virDomainDef *def,
return 0;
}
static int
virDomainFeaturesPCIDefParse(virDomainDef *def,
xmlNodePtr node)
{
def->features[VIR_DOMAIN_FEATURE_PCI] = VIR_TRISTATE_SWITCH_ON;
node = xmlFirstElementChild(node);
while (node) {
int feature;
virTristateSwitch value;
feature = virDomainPCITypeFromString((const char *)node->name);
if (feature < 0) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("unsupported PCI feature: %s"),
node->name);
return -1;
}
if (virXMLPropTristateSwitch(node, "state", VIR_XML_PROP_REQUIRED,
&value) < 0)
return -1;
def->pci_features[feature] = value;
node = xmlNextElementSibling(node);
}
return 0;
}
static int
virDomainFeaturesXENDefParse(virDomainDef *def,
@ -17835,6 +17871,10 @@ virDomainFeaturesDefParse(virDomainDef *def,
break;
}
case VIR_DOMAIN_FEATURE_PCI:
if (virDomainFeaturesPCIDefParse(def, nodes[i]) < 0)
return -1;
case VIR_DOMAIN_FEATURE_LAST:
break;
}
@ -17843,7 +17883,6 @@ virDomainFeaturesDefParse(virDomainDef *def,
return 0;
}
static int
virDomainDefMaybeAddHostdevSCSIcontroller(virDomainDef *def)
{
@ -21521,6 +21560,7 @@ virDomainDefFeaturesCheckABIStability(virDomainDef *src,
case VIR_DOMAIN_FEATURE_HTM:
case VIR_DOMAIN_FEATURE_NESTED_HV:
case VIR_DOMAIN_FEATURE_CCF_ASSIST:
case VIR_DOMAIN_FEATURE_PCI:
if (src->features[i] != dst->features[i]) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("State of feature '%s' differs: "
@ -21777,6 +21817,29 @@ virDomainDefFeaturesCheckABIStability(virDomainDef *src,
}
}
/* pci */
if (src->features[VIR_DOMAIN_FEATURE_PCI] == VIR_TRISTATE_SWITCH_ON) {
for (i = 0; i < VIR_DOMAIN_PCI_LAST; i++) {
switch ((virDomainPCI) i) {
case VIR_DOMAIN_PCI_ACPI_BRIDGE_HOTPLUG:
if (src->pci_features[i] != dst->pci_features[i]) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("State of PCI feature '%s' differs: "
"source: '%s', destination: '%s'"),
virDomainPCITypeToString(i),
virTristateSwitchTypeToString(src->pci_features[i]),
virTristateSwitchTypeToString(dst->pci_features[i]));
return false;
}
break;
case VIR_DOMAIN_PCI_LAST:
break;
}
}
}
/* smm */
if (src->features[VIR_DOMAIN_FEATURE_SMM] == VIR_TRISTATE_SWITCH_ON) {
if (src->tseg_specified != dst->tseg_specified) {
@ -27932,6 +27995,30 @@ virDomainDefFormatFeatures(virBuffer *buf,
virDomainIBSTypeToString(def->features[i]));
break;
case VIR_DOMAIN_FEATURE_PCI:
if (def->features[i] != VIR_TRISTATE_SWITCH_ON)
break;
virBufferAddLit(&childBuf, "<pci>\n");
virBufferAdjustIndent(&childBuf, 2);
for (j = 0; j < VIR_DOMAIN_PCI_LAST; j++) {
switch ((virDomainPCI) j) {
case VIR_DOMAIN_PCI_ACPI_BRIDGE_HOTPLUG:
if (def->pci_features[j] != VIR_TRISTATE_SWITCH_ABSENT)
virBufferAsprintf(&childBuf, "<%s state='%s'/>\n",
virDomainPCITypeToString(j),
virTristateSwitchTypeToString(
def->pci_features[j]));
break;
case VIR_DOMAIN_PCI_LAST:
break;
}
}
virBufferAdjustIndent(&childBuf, -2);
virBufferAddLit(&childBuf, "</pci>\n");
break;
case VIR_DOMAIN_FEATURE_LAST:
break;
}

9
src/conf/domain_conf.h
View File

@ -2044,6 +2044,7 @@ typedef enum {
VIR_DOMAIN_FEATURE_CFPC,
VIR_DOMAIN_FEATURE_SBBC,
VIR_DOMAIN_FEATURE_IBS,
VIR_DOMAIN_FEATURE_PCI,
VIR_DOMAIN_FEATURE_LAST
} virDomainFeature;
@ -2069,6 +2070,12 @@ typedef enum {
VIR_DOMAIN_HYPERV_LAST
} virDomainHyperv;
typedef enum {
VIR_DOMAIN_PCI_ACPI_BRIDGE_HOTPLUG = 0,
VIR_DOMAIN_PCI_LAST
} virDomainPCI;
typedef enum {
VIR_DOMAIN_KVM_HIDDEN = 0,
VIR_DOMAIN_KVM_DEDICATED,
@ -2801,6 +2808,7 @@ struct _virDomainDef {
int features[VIR_DOMAIN_FEATURE_LAST];
int caps_features[VIR_DOMAIN_PROCES_CAPS_FEATURE_LAST];
int hyperv_features[VIR_DOMAIN_HYPERV_LAST];
int pci_features[VIR_DOMAIN_PCI_LAST];
int kvm_features[VIR_DOMAIN_KVM_LAST];
int msrs_features[VIR_DOMAIN_MSRS_LAST];
int xen_features[VIR_DOMAIN_XEN_LAST];
@ -3925,6 +3933,7 @@ VIR_ENUM_DECL(virDomainGraphicsSpiceStreamingMode);
VIR_ENUM_DECL(virDomainGraphicsSpiceMouseMode);
VIR_ENUM_DECL(virDomainGraphicsVNCSharePolicy);
VIR_ENUM_DECL(virDomainHyperv);
VIR_ENUM_DECL(virDomainPCI);
VIR_ENUM_DECL(virDomainKVM);
VIR_ENUM_DECL(virDomainXen);
VIR_ENUM_DECL(virDomainXenPassthroughMode);

46
src/qemu/qemu_validate.c
View File

@ -173,6 +173,48 @@ qemuValidateDomainDefPSeriesFeature(const virDomainDef *def,
return 0;
}
static int
qemuValidateDomainDefPCIFeature(const virDomainDef *def,
virQEMUCaps *qemuCaps,
int feature)
{
size_t i;
bool q35Dom = qemuDomainIsQ35(def);
bool q35cap = q35Dom && virQEMUCapsGet(qemuCaps,
QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE);
if (def->features[feature] == VIR_TRISTATE_SWITCH_ABSENT)
return 0;
for (i = 0; i < VIR_DOMAIN_PCI_LAST; i++) {
if (def->pci_features[i] == VIR_TRISTATE_SWITCH_ABSENT)
continue;
switch ((virDomainPCI) i) {
case VIR_DOMAIN_PCI_ACPI_BRIDGE_HOTPLUG:
if (!ARCH_IS_X86(def->os.arch)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("acpi-bridge-hotplug is not available "
"for architecture '%s'"),
virArchToString(def->os.arch));
return -1;
}
if (!q35cap &&
!virQEMUCapsGet(qemuCaps,
QEMU_CAPS_PIIX4_ACPI_HOTPLUG_BRIDGE)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("acpi-bridge-hotplug is not available "
"with this QEMU binary"));
return -1;
}
break;
case VIR_DOMAIN_PCI_LAST:
break;
}
}
return 0;
}
static int
qemuValidateDomainDefFeatures(const virDomainDef *def,
@ -294,6 +336,10 @@ qemuValidateDomainDefFeatures(const virDomainDef *def,
}
break;
case VIR_DOMAIN_FEATURE_PCI:
if (qemuValidateDomainDefPCIFeature(def, qemuCaps, i) < 0)
return -1;
break;
case VIR_DOMAIN_FEATURE_SMM:
case VIR_DOMAIN_FEATURE_KVM:
case VIR_DOMAIN_FEATURE_XEN:

33
tests/qemuxml2argvdata/aarch64-acpi-hotplug-bridge-disable.xml Normal file
View File

@ -0,0 +1,33 @@
<domain type='qemu'>
<name>i440fx</name>
<uuid>56f5055c-1b8d-490c-844a-ad646a1caaaa</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='aarch64' machine='virt'>hvm</type>
<boot dev='network'/>
</os>
<features>
<pci>
<acpi-bridge-hotplug state='off'/>
</pci>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-aarch64</emulator>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</memballoon>
</devices>
</domain>

33
tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.xml Normal file
View File

@ -0,0 +1,33 @@
<domain type='qemu'>
<name>i440fx</name>
<uuid>56f5055c-1b8d-490c-844a-ad646a1caaaa</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type>
<boot dev='network'/>
</os>
<features>
<pci>
<acpi-bridge-hotplug state='off'/>
</pci>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</memballoon>
</devices>
</domain>

33
tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-enable.xml Normal file
View File

@ -0,0 +1,33 @@
<domain type='qemu'>
<name>i440fx</name>
<uuid>56f5055c-1b8d-490c-844a-ad646a1caaaa</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type>
<boot dev='network'/>
</os>
<features>
<pci>
<acpi-bridge-hotplug state='on'/>
</pci>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</memballoon>
</devices>
</domain>

47
tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.xml Normal file
View File

@ -0,0 +1,47 @@
<domain type='qemu'>
<name>q35</name>
<uuid>56f5055c-1b8d-490c-844a-ad646a1caaaa</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-q35-2.5'>hvm</type>
<boot dev='network'/>
</os>
<features>
<pci>
<acpi-bridge-hotplug state='off'/>
</pci>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pcie-root'/>
<controller type='pci' index='1' model='dmi-to-pci-bridge'>
<model name='i82801b11-bridge'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1e' function='0x0'/>
</controller>
<controller type='pci' index='2' model='pci-bridge'>
<model name='pci-bridge'/>
<target chassisNr='2'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</controller>
<controller type='pci' index='3' model='pcie-root-port'>
<model name='ioh3420'/>
<target chassis='3' port='0x8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
</controller>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
</memballoon>
</devices>
</domain>

47
tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-enable.xml Normal file
View File

@ -0,0 +1,47 @@
<domain type='qemu'>
<name>q35</name>
<uuid>56f5055c-1b8d-490c-844a-ad646a1caaaa</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-q35-2.5'>hvm</type>
<boot dev='network'/>
</os>
<features>
<pci>
<acpi-bridge-hotplug state='on'/>
</pci>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pcie-root'/>
<controller type='pci' index='1' model='dmi-to-pci-bridge'>
<model name='i82801b11-bridge'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1e' function='0x0'/>
</controller>
<controller type='pci' index='2' model='pci-bridge'>
<model name='pci-bridge'/>
<target chassisNr='2'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</controller>
<controller type='pci' index='3' model='pcie-root-port'>
<model name='ioh3420'/>
<target chassis='3' port='0x8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
</controller>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
</memballoon>
</devices>
</domain>

1
tests/qemuxml2xmloutdata/pc-i440fx-acpi-hotplug-bridge-disable.xml Symbolic link
View File

@ -0,0 +1 @@
../qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.xml

1
tests/qemuxml2xmloutdata/pc-i440fx-acpi-hotplug-bridge-enable.xml Symbolic link
View File

@ -0,0 +1 @@
../qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-enable.xml

1
tests/qemuxml2xmloutdata/q35-acpi-hotplug-bridge-disable.xml Symbolic link
View File

@ -0,0 +1 @@
../qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.xml

1
tests/qemuxml2xmloutdata/q35-acpi-hotplug-bridge-enable.xml Symbolic link
View File

@ -0,0 +1 @@
../qemuxml2argvdata/q35-acpi-hotplug-bridge-enable.xml

14
tests/qemuxml2xmltest.c
View File

@ -428,6 +428,20 @@ mymain(void)
QEMU_CAPS_PIIX4_ACPI_ROOT_PCI_HOTPLUG);
DO_TEST("pc-i440fx-acpi-root-hotplug-enable",
QEMU_CAPS_PIIX4_ACPI_ROOT_PCI_HOTPLUG);
DO_TEST("pc-i440fx-acpi-hotplug-bridge-disable",
QEMU_CAPS_PIIX4_ACPI_HOTPLUG_BRIDGE);
DO_TEST("pc-i440fx-acpi-hotplug-bridge-enable",
QEMU_CAPS_PIIX4_ACPI_HOTPLUG_BRIDGE);
DO_TEST("q35-acpi-hotplug-bridge-disable",
QEMU_CAPS_DEVICE_PCI_BRIDGE,
QEMU_CAPS_DEVICE_IOH3420,
QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE);
DO_TEST("q35-acpi-hotplug-bridge-enable",
QEMU_CAPS_DEVICE_PCI_BRIDGE,
QEMU_CAPS_DEVICE_IOH3420,
QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE);
DO_TEST("misc-disable-suspends",
QEMU_CAPS_PIIX_DISABLE_S3,
QEMU_CAPS_PIIX_DISABLE_S4);