From: Nico Pache <npache@redhat.com>
Date: Mon, 12 Oct 2020 23:35:38 +0000 (-0400)
Subject: QEMU: introduce Virtio free page reporting feature
X-Git-Tag: v6.9.0-rc1~163
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=021fea29c3dbeff994d7afc081fa274bf4bc3eca;p=thirdparty%2Flibvirt.git

QEMU: introduce Virtio free page reporting feature

This patch enables the free-page-reporting in qemu.

Signed-off-by: Nico Pache <npache@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
---

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index eec860382c..697a2db62b 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3830,6 +3830,11 @@ qemuBuildMemballoonCommandLine(virCommandPtr cmd,
                           virTristateSwitchTypeToString(def->memballoon->autodeflate));
     }
 
+    if (def->memballoon->free_page_reporting != VIR_TRISTATE_SWITCH_ABSENT) {
+        virBufferAsprintf(&buf, ",free-page-reporting=%s",
+                          virTristateSwitchTypeToString(def->memballoon->free_page_reporting));
+    }
+
     qemuBuildVirtioOptionsStr(&buf, def->memballoon->virtio);
 
     if (qemuCommandAddExtDevice(cmd, &def->memballoon->info) < 0)
diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index a212605579..27e10d59fd 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -3926,6 +3926,13 @@ qemuValidateDomainDeviceDefMemballoon(const virDomainMemballoonDef *memballoon,
         return -1;
     }
 
+    if (memballoon->free_page_reporting != VIR_TRISTATE_SWITCH_ABSENT &&
+        !virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_BALLOON_FREE_PAGE_REPORTING)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("free-page-reporting is not supported by this QEMU binary"));
+        return -1;
+    }
+
     if (qemuValidateDomainVirtioOptions(memballoon->virtio, qemuCaps) < 0)
         return -1;