[PATCH v5 1/4] qemu: capablities: detect presence of acpi-pci-hotplug-with-bridge-support

Ani Sinha ani at anisinha.ca
Sat Oct 2 03:27:04 UTC 2021 

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>
Reviewed-by: Laine Stump <laine at redhat.com>
---
 src/qemu/qemu_capabilities.c                      | 4 ++++
 src/qemu/qemu_capabilities.h                      | 2 ++
 tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml | 1 +
 tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml | 1 +
 tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml  | 2 ++
 14 files changed, 19 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 6d1389af87..4b93ae7791 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -644,6 +644,8 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "virtio-mem-pci", /* QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI */
               "memory-backend-file.reserve", /* QEMU_CAPS_MEMORY_BACKEND_RESERVE */
               "piix4-acpi-root-hotplug-en", /* QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG */
+              "piix4-acpi-hotplug-bridge", /* QEMU_CAPS_PIIX_ACPI_HOTPLUG_BRIDGE */
+              "ich9-acpi-hotplug-bridge", /* QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE */
     );
 
 
@@ -1472,6 +1474,7 @@ static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsPiix4PM[] = {
     { "disable_s3", QEMU_CAPS_PIIX_DISABLE_S3, NULL },
     { "disable_s4", QEMU_CAPS_PIIX_DISABLE_S4, NULL },
     { "acpi-root-pci-hotplug", QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG, NULL },
+    { "acpi-pci-hotplug-with-bridge-support", QEMU_CAPS_PIIX_ACPI_HOTPLUG_BRIDGE, NULL },
 };
 
 static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsUSBRedir[] = {
@@ -1524,6 +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 867c94cb3d..721cfa732e 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -624,6 +624,8 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI, /* -device virtio-mem-pci */
     QEMU_CAPS_MEMORY_BACKEND_RESERVE, /* -object memory-backend-*.reserve= */
     QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG, /* -M pc PIIX4_PM.acpi-root-pci-hotplug */
+    QEMU_CAPS_PIIX_ACPI_HOTPLUG_BRIDGE, /* -M pc PIIX4_PM.acpi-pci-hotplug-with-bridge-support */
+    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_2.11.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml
index d6549d6440..0f20a9b5b0 100644
--- a/tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml
@@ -172,6 +172,7 @@
   <flag name='am53c974'/>
   <flag name='cpu-max'/>
   <flag name='input-linux'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>2011000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100288</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
index 354a95cebc..e5efd97203 100644
--- a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
@@ -184,6 +184,7 @@
   <flag name='cpu-max'/>
   <flag name='input-linux'/>
   <flag name='virtio-blk.queue-size'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100289</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
index cffe482bf6..713752f8f2 100644
--- a/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
@@ -190,6 +190,7 @@
   <flag name='cpu-max'/>
   <flag name='input-linux'/>
   <flag name='virtio-blk.queue-size'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>3000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100239</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
index 514e5985ac..4cdba06edb 100644
--- a/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
@@ -194,6 +194,7 @@
   <flag name='input-linux'/>
   <flag name='query-display-options'/>
   <flag name='virtio-blk.queue-size'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>3000092</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
index 5e733fec13..5b9c59cfa7 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
@@ -202,6 +202,7 @@
   <flag name='input-linux'/>
   <flag name='query-display-options'/>
   <flag name='virtio-blk.queue-size'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>4000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
index ba9ee0dd96..5bb3856918 100644
--- a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
@@ -209,6 +209,7 @@
   <flag name='input-linux'/>
   <flag name='query-display-options'/>
   <flag name='virtio-blk.queue-size'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>4001000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
index 034a770b08..77c95496e0 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
@@ -220,6 +220,7 @@
   <flag name='input-linux'/>
   <flag name='query-display-options'/>
   <flag name='virtio-blk.queue-size'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>4002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index aae5fe018f..bf679a715c 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -227,6 +227,7 @@
   <flag name='input-linux'/>
   <flag name='query-display-options'/>
   <flag name='virtio-blk.queue-size'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>5000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
index e9ae3c5abb..8bc898e4db 100644
--- a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
@@ -230,6 +230,7 @@
   <flag name='query-display-options'/>
   <flag name='virtio-blk.queue-size'/>
   <flag name='virtio-mem-pci'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>5001000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
index 79d36bf19f..5071bcc293 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
@@ -232,6 +232,7 @@
   <flag name='virtio-blk.queue-size'/>
   <flag name='virtio-mem-pci'/>
   <flag name='piix4-acpi-root-hotplug-en'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>5002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
index 0d8edef6a1..267ccd73a0 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
@@ -240,6 +240,7 @@
   <flag name='virtio-blk.queue-size'/>
   <flag name='virtio-mem-pci'/>
   <flag name='piix4-acpi-root-hotplug-en'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
   <version>6000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
index 7ba3b328ca..8fd236d08c 100644
--- a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
@@ -243,6 +243,8 @@
   <flag name='virtio-mem-pci'/>
   <flag name='memory-backend-file.reserve'/>
   <flag name='piix4-acpi-root-hotplug-en'/>
+  <flag name='piix4-acpi-hotplug-bridge'/>
+  <flag name='ich9-acpi-hotplug-bridge'/>
   <version>6001000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100243</microcodeVersion>
-- 
2.25.1

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