[libvirt] [PATCH RESEND v2 1/4] qemu: capablities: detect acpi-pci-hotplug-with-bridge-support

[Ani Sinha]

qemu added support for i440fx specific global boolean flag

PIIX4_PM.acpi-pci-hotplug-with-bridge-support

around version 2.1. This flag is enabled by default. When disabled, it
turns off acpi pci hotplug for cold plugged pci bridges in i440fx
machine types.

Very recently, in qemu version 6.1, the same global option was also
added for q35 machine types as well.

ICH9-LPC.acpi-pci-hotplug-with-bridge-support

This option turns on or off acpi based hotplug for cold plugged pcie
bridges like pcie root ports. This flag is also enabled by
default. Please refer to the following qemu changes:

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

This patch adds the corresponding qemu capabilities in libvirt. For
i440fx, the capability is detected as
QEMU_CAPS_PIIX_ACPI_HOTPLUG_BRIDGE. For q35, the capability is
detected as QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE.

Please note that the test specific qemu capabilities .replies files
has already been updated as a part of regular refreshing them when a
new qemu version is released. Hence, no updates to those files are
required.

Signed-off-by: Ani Sinha <ani at anisinha.ca>
---
 src/qemu/qemu_capabilities.c                     | 4 ++++
 src/qemu/qemu_capabilities.h                     | 3 +++
 tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml | 1 +
 tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml | 1 +
 tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml | 1 +
 5 files changed, 10 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 529e9ceaf5..08d5d733ce 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -665,6 +665,9 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "virtio-mem-pci.prealloc", /* QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI_PREALLOC */
               "calc-dirty-rate", /* QEMU_CAPS_CALC_DIRTY_RATE */
               "dirtyrate-param.mode", /* QEMU_CAPS_DIRTYRATE_MODE */
+
+              /* 425 */
+              "ich9.acpi-hotplug-bridge", /* QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE */
     );
 
 
@@ -1551,6 +1554,7 @@ 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 f6188b42de..51dc668913 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -641,6 +641,9 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_CALC_DIRTY_RATE, /* accepts calc-dirty-rate */
     QEMU_CAPS_DIRTYRATE_MODE , /* calc-dirty-rate accepts mode parameter */
 
+    /* 425 */
+    QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE, /* -M q35 ICH9-LPC.acpi-pci-hotplug-with-bridge-support */
+
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
 
diff --git a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
index ba1aecc37e..51e1e07d2f 100644
--- a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
@@ -239,6 +239,7 @@
   <flag name='rbd-encryption'/>
   <flag name='sev-inject-launch-secret'/>
   <flag name='calc-dirty-rate'/>
+  <flag name='ich9.acpi-hotplug-bridge'/>
   <version>6001000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
index d77907af55..7b665c82e8 100644
--- a/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.2.0.x86_64.xml
@@ -241,6 +241,7 @@
   <flag name='sev-inject-launch-secret'/>
   <flag name='calc-dirty-rate'/>
   <flag name='dirtyrate-param.mode'/>
+  <flag name='ich9.acpi-hotplug-bridge'/>
   <version>6002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100244</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
index ae800abcc4..692e2f14da 100644
--- a/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_7.0.0.x86_64.xml
@@ -243,6 +243,7 @@
   <flag name='virtio-mem-pci.prealloc'/>
   <flag name='calc-dirty-rate'/>
   <flag name='dirtyrate-param.mode'/>
+  <flag name='ich9.acpi-hotplug-bridge'/>
   <version>6002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100243</microcodeVersion>
-- 
2.25.1