[PATCH 5/8] qemu: Introduce QEMU_CAPS_MACHINE_MEMORY_BACKEND

[Michal Privoznik]

This capability corresponds to '-machine memory-backend=' command
line argument. Unfortunately, it is not possible for us to detect
the capability via QMP and therefore we have to have a version
check.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/qemu/qemu_capabilities.c                      | 7 +++++++
 src/qemu/qemu_capabilities.h                      | 3 +++
 tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
 tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml   | 1 +
 tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml | 1 +
 tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml  | 1 +
 7 files changed, 15 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index f12769635a..801200c4e7 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -582,6 +582,9 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "tcg",
               "virtio-blk-pci.scsi.default.disabled",
               "pvscsi",
+
+              /* 370 */
+              "machine.memory-backend",
     );
 
 
@@ -4985,6 +4988,10 @@ virQEMUCapsInitQMPVersionCaps(virQEMUCapsPtr qemuCaps)
     /* TCG couldn't be disabled nor queried until QEMU 2.10 */
     if (qemuCaps->version < 2010000)
         virQEMUCapsSet(qemuCaps, QEMU_CAPS_TCG);
+
+    /* no way to query for -machine memory-backend */
+    if (qemuCaps->version >= 5000000)
+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_MEMORY_BACKEND);
 }
 
 
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 076ecad0f7..bc2c432609 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -564,6 +564,9 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_VIRTIO_BLK_SCSI_DEFAULT_DISABLED, /* virtio-blk-pci.scsi disabled by default */
     QEMU_CAPS_SCSI_PVSCSI, /* -device pvscsi */
 
+    /* 370 */
+    QEMU_CAPS_MACHINE_MEMORY_BACKEND, /* -machine memory-backend */
+
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
 
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
index 9b24490137..97b85bce47 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
@@ -193,6 +193,7 @@
   <flag name='tcg'/>
   <flag name='virtio-blk-pci.scsi.default.disabled'/>
   <flag name='pvscsi'/>
+  <flag name='machine.memory-backend'/>
   <version>5000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>61700241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
index 69e5b4c8fa..4685672f36 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
@@ -201,6 +201,7 @@
   <flag name='tcg'/>
   <flag name='virtio-blk-pci.scsi.default.disabled'/>
   <flag name='pvscsi'/>
+  <flag name='machine.memory-backend'/>
   <version>5000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
index 7a091d27db..c04c42c0a4 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.riscv64.xml
@@ -189,6 +189,7 @@
   <flag name='tcg'/>
   <flag name='virtio-blk-pci.scsi.default.disabled'/>
   <flag name='pvscsi'/>
+  <flag name='machine.memory-backend'/>
   <version>5000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index ba39fef713..931aee1259 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -234,6 +234,7 @@
   <flag name='tcg'/>
   <flag name='virtio-blk-pci.scsi.default.disabled'/>
   <flag name='pvscsi'/>
+  <flag name='machine.memory-backend'/>
   <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 c2bc121f73..c1adce73ab 100644
--- a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
@@ -234,6 +234,7 @@
   <flag name='tcg'/>
   <flag name='virtio-blk-pci.scsi.default.disabled'/>
   <flag name='pvscsi'/>
+  <flag name='machine.memory-backend'/>
   <version>5000050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>
-- 
2.26.2