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To:libvir-list@redhat.com From:Eric Blake Subject:[libvirt] [PATCHv2 1/2] qemu: reflect any memory rounding back to xml Date:Fri, 30 Mar 2012 09:56:04 -0600
 

If we round up a user's memory request, we should update the XML
to reflect the actual value in use by the VM, rather than giving
an artificially small value back to the user.

* src/qemu/qemu_command.c (qemuBuildNumaArgStr)
(qemuBuildCommandLine): Reflect rounding back to XML.
---
src/qemu/qemu_command.c | 11 +++++++----
1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3d2bb6b..8f6471b 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3916,8 +3916,9 @@ qemuBuildNumaArgStr(const virDomainDefPtr def, virCommandPtr cmd)
virBufferAsprintf(&buf, "node,nodeid=%d", def->cpu->cells[i].cellid);
virBufferAddLit(&buf, ",cpus=");
qemuBuildNumaCPUArgStr(def->cpu->cells[i].cpumask, &buf);
- virBufferAsprintf(&buf, "mem=%d",
- VIR_DIV_UP(def->cpu->cells[i].mem, 1024));
+ def->cpu->cells[i].mem = VIR_DIV_UP(def->cpu->cells[i].mem,
+ 1024) * 1024;
+ virBufferAsprintf(&buf, "mem=%d", def->cpu->cells[i].mem / 1024);

if (virBufferError(&buf))
goto error;
@@ -4061,10 +4062,12 @@ qemuBuildCommandLine(virConnectPtr conn,

/* Set '-m MB' based on maxmem, because the lower 'memory' limit
* is set post-startup using the balloon driver. If balloon driver
- * is not supported, then they're out of luck anyway
+ * is not supported, then they're out of luck anyway. Update the
+ * XML to reflect our rounding.
*/
virCommandAddArg(cmd, "-m");
- virCommandAddArgFormat(cmd, "%llu", VIR_DIV_UP(def->mem.max_balloon, 1024));
+ def->mem.max_balloon = VIR_DIV_UP(def->mem.max_balloon, 1024) * 1024;
+ virCommandAddArgFormat(cmd, "%llu", def->mem.max_balloon / 1024);
if (def->mem.hugepage_backed) {
if (!driver->hugetlbfs_mount) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
--
1.7.1

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