qemu_capabilities: Introduce QEMU_CAPS_OVERCOMMIT

Added in QEMU commit of v3.0.0-rc0~48^2~9 (then fixed by
v3.1.0-rc0~119^2~37) QEMU is replacing '-realtime mlock' with
'-overcommit mem-lock'. Add a capability to tell if we're dealing
new new enough qemu to use the replacement.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_capabilities.c

@@ -525,6 +525,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "nvdimm.unarmed",
               "scsi-disk.device_id",
               "virtio-pci-non-transitional",
+              "overcommit",
     );
 
 
@@ -2659,6 +2660,7 @@ static struct virQEMUCapsCommandLineProps virQEMUCapsCommandLine[] = {
     { "sandbox", "enable", QEMU_CAPS_SECCOMP_SANDBOX },
     { "sandbox", "elevateprivileges", QEMU_CAPS_SECCOMP_BLACKLIST },
     { "chardev", "fd", QEMU_CAPS_CHARDEV_FD_PASS },
+    { "overcommit", NULL, QEMU_CAPS_OVERCOMMIT },
 };
 
 static int

src/qemu/qemu_capabilities.h

@@ -507,6 +507,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_DEVICE_NVDIMM_UNARMED, /* -device nvdimm,unarmed= */
     QEMU_CAPS_SCSI_DISK_DEVICE_ID, /* 'device_id' property of scsi disk */
     QEMU_CAPS_VIRTIO_PCI_TRANSITIONAL, /* virtio *-pci-{non-}transitional devices */
+    QEMU_CAPS_OVERCOMMIT, /* -overcommit */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_3.1.0.ppc64.xml

@@ -155,6 +155,7 @@
   <flag name='machine.pseries.cap-nested-hv'/>
   <flag name='memory-backend-file.align'/>
   <flag name='memory-backend-file.pmem'/>
+  <flag name='overcommit'/>
   <version>3000091</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900758</microcodeVersion>

tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml

@@ -199,6 +199,7 @@
   <flag name='memory-backend-file.align'/>
   <flag name='memory-backend-file.pmem'/>
   <flag name='nvdimm.unarmed'/>
+  <flag name='overcommit'/>
   <version>3000092</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100758</microcodeVersion>

tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml

@@ -162,6 +162,7 @@
   <flag name='memory-backend-file.pmem'/>
   <flag name='scsi-disk.device_id'/>
   <flag name='virtio-pci-non-transitional'/>
+  <flag name='overcommit'/>
   <version>3001091</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>0</microcodeVersion>

tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml

@@ -162,6 +162,7 @@
   <flag name='memory-backend-file.pmem'/>
   <flag name='scsi-disk.device_id'/>
   <flag name='virtio-pci-non-transitional'/>
+  <flag name='overcommit'/>
   <version>3001091</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>0</microcodeVersion>

tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml

@@ -200,6 +200,7 @@
   <flag name='nvdimm.unarmed'/>
   <flag name='scsi-disk.device_id'/>
   <flag name='virtio-pci-non-transitional'/>
+  <flag name='overcommit'/>
   <version>3001050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100758</microcodeVersion>