[RFC PATCH] add support for two global pm options that controls acpi hotplug on q35/i440fx
Ani Sinha
ani at anisinha.ca
Mon Aug 16 14:01:55 UTC 2021
'acpi-pci-hotplug-with-bridge-support' and 'acpi-root-pci-hotplug' are two pm
options in qemu that governs acpi hotplug support. This is a WIP patch that
tries to implement support for both these two global qemu options.
'acpi-pci-hotplug-with-bridge-support' applies both for q35 as well as i440fx
platforms. The 'acpi-root-pci-hotplug' only applies for i440fx.
'acpi-pci-hotplug-with-bridge-support' can be turned off by providing the
following xml snippet:
<pm>
<acpi-hotplug-bridge enabled='no'>
</pm>
Similarly, 'acpi-root-pci-hotplug' can be turned off by providing the following
xml snippet:
<pm>
<acpi-root-hotplug enabled='no'>
</pm>
This change adds no unit tests. It will be added later on. It it sent for
initial comments and suggestions.
Signed-off-by: Ani Sinha <ani at anisinha.ca>
---
src/conf/domain_conf.c | 10 ++++++++++
src/conf/domain_conf.h | 2 ++
src/qemu/qemu_capabilities.c | 9 +++++++++
src/qemu/qemu_capabilities.h | 5 +++++
src/qemu/qemu_command.c | 28 ++++++++++++++++++++++++++++
src/qemu/qemu_validate.c | 21 +++++++++++++++++++++
6 files changed, 75 insertions(+)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 06c1fcf5e5..512973e6f4 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -19351,6 +19351,16 @@ virDomainDefLifecycleParse(virDomainDef *def,
&def->pm.s4) < 0)
goto error;
+ if (virDomainPMStateParseXML(ctxt,
+ "string(./pm/acpi-hotplug-bridge/@enabled)",
+ &def->pm.acpi_hp_bridge) < 0)
+ goto error;
+
+ if (virDomainPMStateParseXML(ctxt,
+ "string(./pm/acpi-root-hotplug/@enabled)",
+ &def->pm.acpi_root_hp) < 0)
+ goto error;
+
return 0;
error:
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index ca21082624..94283cbb04 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2643,6 +2643,8 @@ struct _virDomainPowerManagement {
/* These options are of type enum virTristateBool */
int s3;
int s4;
+ int acpi_hp_bridge;
+ int acpi_root_hp;
};
struct _virDomainPerfDef {
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 9558938866..8dad4a6351 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -637,6 +637,11 @@ VIR_ENUM_IMPL(virQEMUCaps,
"confidential-guest-support",
"query-display-options",
"s390-pv-guest",
+ "piix4-acpi-hotplug-bridge",
+ "piix4-acpi-root-hotplug-en",
+
+ /* 410 */
+ "ich9-acpi-hotplug-bridge",
);
@@ -1467,6 +1472,9 @@ static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsIDEDrive[] = {
static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsPiix4PM[] = {
{ "disable_s3", QEMU_CAPS_PIIX_DISABLE_S3, NULL },
{ "disable_s4", QEMU_CAPS_PIIX_DISABLE_S4, NULL },
+ { "acpi-pci-hotplug-with-bridge-support", QEMU_CAPS_PIIX_ACPI_HOTPLUG_BRIDGE, NULL },
+ { "acpi-root-pci-hotplug", QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG, NULL },
+
};
static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsUSBRedir[] = {
@@ -1519,6 +1527,7 @@ static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsVirtioGpu[] = {
static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsICH9[] = {
{ "disable_s3", QEMU_CAPS_ICH9_DISABLE_S3, NULL },
{ "disable_s4", QEMU_CAPS_ICH9_DISABLE_S4, NULL },
+ { "acpi-pci-hotplug-with-bridge-support", QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE, NULL },
};
static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsUSBNECXHCI[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 2b1bb57a49..e988527f39 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -617,6 +617,11 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
QEMU_CAPS_MACHINE_CONFIDENTAL_GUEST_SUPPORT, /* -machine confidential-guest-support */
QEMU_CAPS_QUERY_DISPLAY_OPTIONS, /* 'query-display-options' qmp command present */
QEMU_CAPS_S390_PV_GUEST, /* -object s390-pv-guest,... */
+ QEMU_CAPS_PIIX_ACPI_HOTPLUG_BRIDGE, /* -M pc PIIX4_PM.acpi-pci-hotplug-with-bridge-support */
+ QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG, /* -M pc PIIX4_PM.acpi-root-pci-hotplug */
+
+ /* 410 */
+ QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE, /* -M q35 PIIX4_PM.acpi-pci-hotplug-with-bridge-support */
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 156af4caee..5a7a23d5b9 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6171,6 +6171,34 @@ qemuBuildPMCommandLine(virCommand *cmd,
pm_object, def->pm.s4 == VIR_TRISTATE_BOOL_NO);
}
+ if (def->pm.acpi_hp_bridge) {
+ const char *pm_object = "PIIX4_PM";
+ const char *switch_str = "on";
+
+ if (def->pm.acpi_hp_bridge == VIR_TRISTATE_BOOL_NO)
+ switch_str = "off";
+
+ if (qemuDomainIsQ35(def) &&
+ virQEMUCapsGet(qemuCaps, QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE))
+ pm_object = "ICH9-LPC";
+
+ virCommandAddArg(cmd, "-global");
+ virCommandAddArgFormat(cmd, "%s.acpi-pci-hotplug-with-bridge-support=%s",
+ pm_object, switch_str);
+ }
+
+ if (def->pm.acpi_root_hp) {
+ const char *pm_object = "PIIX4_PM";
+ const char *switch_str = "on";
+
+ if (def->pm.acpi_hp_bridge == VIR_TRISTATE_BOOL_NO)
+ switch_str = "off";
+
+ virCommandAddArg(cmd, "-global");
+ virCommandAddArgFormat(cmd, "%s.acpi-root-pci-hotplug=%s",
+ pm_object, switch_str);
+ }
+
return 0;
}
diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index a964c8593d..22403e6d01 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -560,6 +560,27 @@ qemuValidateDomainDefPM(const virDomainDef *def,
}
}
+ if (def->pm.acpi_hp_bridge) {
+ bool q35ICH9_pcihpbr = q35Dom &&
+ virQEMUCapsGet(qemuCaps,
+ QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE);
+
+ if (!q35ICH9_pcihpbr && !virQEMUCapsGet(qemuCaps,
+ QEMU_CAPS_PIIX_ACPI_HOTPLUG_BRIDGE)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ "%s", _("setting ACPI hotplug bridge not supported"));
+ return -1;
+ }
+ }
+
+ if (def->pm.acpi_root_hp) {
+ if (!q35Dom && !virQEMUCapsGet(qemuCaps, QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ "%s", _("setting ACPI root pci hotplug not supported"));
+ return -1;
+ }
+ }
+
return 0;
}
--
2.25.1
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