[libvirt] [RFC] [Patch] Make hugepage testcase arch-agnostic

[Prerna Saxena]

Hi,
I have attached this patch as a response to a recent failure observed on PowerPC architecture by commit
311b4a67.
This patch introduces a check for dynamically obtaining system page size for test hugepages-pages6 under 'qemuxml2argv' suite. ( See patch for more verbose problem description)
This patch is not the most perfect implementation -- it fails syntax check; and has a Makefile-driven cleanup pending. I will be happy to deck it up and send it if the community concurs with this
approach.

We could also implement this via a shell script ( just like 'virt-test-aa-helper')  but I couldnt find an easy way to determine host page size.

Awaiting community responses,
Prerna

>From 8a64d4d22e2e65158d3caa45b615ca9a263f841f Mon Sep 17 00:00:00 2001
From: Prerna Saxena <prerna at linux.vnet.ibm.com>
Date: Mon, 2 Feb 2015 10:48:48 +0530
Subject: [PATCH] Commit 311b4a67 introduces a test for normal-page backed
 guest XML. However, it hardcodes the page size to 4 KB which is only valid
 for Intel Make check consequently fails on PowerPC where page size is 64KB

This makes the hugepages-pages6 test more modular, and enables the page size
to be picked up at runtime.
---
 .../qemuxml2argv-hugepages-pages6.template         | 32 ++++++++++++++++++++++
 tests/qemuxml2argvtest.c                           | 24 +++++++++++++++-
 2 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages6.template

diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages6.template b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages6.template
new file mode 100644
index 0000000..8b9b995
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-pages6.template
@@ -0,0 +1,32 @@
+<domain type='qemu'>
+  <name>SomeDummyHugepagesGuest</name>
+  <uuid>ef1bdff4-27f3-4e85-a807-5fb4d58463cc</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <currentMemory unit='KiB'>1048576</currentMemory>
+  <memoryBacking>
+    <hugepages>
+      <page size='%llu' unit='KiB'/>
+    </hugepages>
+  </memoryBacking>
+  <vcpu placement='static'>2</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 89afa81..a16d937 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -479,6 +479,11 @@ mymain(void)
 {
     int ret = 0;
     bool skipLegacyCPUs = false;
+    const long system_page_size = sysconf(_SC_PAGESIZE) / 1024;
+    int fd_in;
+    FILE *f_out;
+    char *template, *xml = NULL;
+    char buf[1000];
 
     abs_top_srcdir = getenv("abs_top_srcdir");
     if (!abs_top_srcdir)
@@ -702,7 +707,24 @@ mymain(void)
     DO_TEST_FAILURE("hugepages-pages4", QEMU_CAPS_MEM_PATH,
             QEMU_CAPS_OBJECT_MEMORY_RAM, QEMU_CAPS_OBJECT_MEMORY_FILE);
     DO_TEST("hugepages-pages5", QEMU_CAPS_MEM_PATH);
-    DO_TEST("hugepages-pages6", NONE);
+
+    if (virAsprintf(&template, "%s/qemuxml2argvdata/qemuxml2argv-%s.template",
+                    abs_srcdir, "hugepages-pages6") < 0 ||
+        virAsprintf(&xml, "%s/qemuxml2argvdata/qemuxml2argv-%s.xml",
+                    abs_srcdir, "hugepages-pages6") < 0)
+        return EXIT_FAILURE;
+    fd_in = open(template, O_RDONLY);
+    f_out = fopen(xml, "w");
+
+    if ( fd_in != -1 && f_out != NULL ) {
+        if(read(fd_in, &buf, sizeof(buf))) {
+            fprintf(f_out, buf,system_page_size);
+            fclose(f_out);
+            close(fd_in);
+            DO_TEST("hugepages-pages6", NONE);
+        }
+    }
+
     DO_TEST("nosharepages", QEMU_CAPS_MACHINE_OPT, QEMU_CAPS_MEM_MERGE);
     DO_TEST("disk-cdrom", NONE);
     DO_TEST("disk-cdrom-network-http", QEMU_CAPS_KVM, QEMU_CAPS_DEVICE,
-- 
1.9.3

-- 
Prerna Saxena

Linux Technology Centre,
IBM Systems and Technology Lab,
Bangalore, India