[libvirt] [PATCH 5/5] qemuBuildMemoryBackendProps: Get pagesize early
Michal Privoznik
mprivozn at redhat.com
Mon Apr 1 14:04:37 UTC 2019
https://bugzilla.redhat.com/show_bug.cgi?id=1693066
Up until memfd introduction (in 24b74d187ca) we did not need to
know @pagesize because qemuGetDomainHupageMemPath() could deal
with it being zero (value of zero means use the default hugetlbfs
mount). But since for memfd we are not passing a path to
hugetlbfs mount rather the page size value we need to know its
value upfront.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/qemu/qemu_command.c | 14 +++++++
...memory-default-hugepage.x86_64-latest.args | 37 ++++++++++++++++
.../memfd-memory-default-hugepage.xml | 42 +++++++++++++++++++
tests/qemuxml2argvtest.c | 1 +
.../memfd-memory-default-hugepage.xml | 1 +
tests/qemuxml2xmltest.c | 3 ++
6 files changed, 98 insertions(+)
create mode 100644 tests/qemuxml2argvdata/memfd-memory-default-hugepage.x86_64-latest.args
create mode 100644 tests/qemuxml2argvdata/memfd-memory-default-hugepage.xml
create mode 120000 tests/qemuxml2xmloutdata/memfd-memory-default-hugepage.xml
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index f81d20e5f7..ba1b56c2da 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3547,6 +3547,20 @@ qemuBuildMemoryBackendProps(virJSONValuePtr *backendProps,
pagesize = 0;
needHugepage = false;
useHugepage = false;
+ } else if (pagesize == 0) {
+ virHugeTLBFSPtr p;
+
+ if (!cfg->nhugetlbfs) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("hugetlbfs filesystem is not mounted "
+ "or disabled by administrator config"));
+ goto cleanup;
+ }
+
+ if (!(p = virFileGetDefaultHugepage(cfg->hugetlbfs, cfg->nhugetlbfs)))
+ p = &cfg->hugetlbfs[0];
+
+ pagesize = p->size;
}
if (!(props = virJSONValueNewObject()))
diff --git a/tests/qemuxml2argvdata/memfd-memory-default-hugepage.x86_64-latest.args b/tests/qemuxml2argvdata/memfd-memory-default-hugepage.x86_64-latest.args
new file mode 100644
index 0000000000..c582878a12
--- /dev/null
+++ b/tests/qemuxml2argvdata/memfd-memory-default-hugepage.x86_64-latest.args
@@ -0,0 +1,37 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-instance-00000092 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-instance-00000092/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-instance-00000092/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-instance-00000092/.config \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name guest=instance-00000092,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-instance-00000092/master-key.aes \
+-machine pc-i440fx-wily,accel=kvm,usb=off,dump-guest-core=off \
+-m 14336 \
+-mem-prealloc \
+-realtime mlock=off \
+-smp 8,sockets=1,cores=8,threads=1 \
+-object memory-backend-memfd,id=ram-node0,hugetlb=yes,hugetlbsize=2097152,\
+share=yes,size=15032385536,host-nodes=3,policy=preferred \
+-numa node,nodeid=0,cpus=0-7,memdev=ram-node0 \
+-uuid 126f2720-6f8e-45ab-a886-ec9277079a67 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on
diff --git a/tests/qemuxml2argvdata/memfd-memory-default-hugepage.xml b/tests/qemuxml2argvdata/memfd-memory-default-hugepage.xml
new file mode 100644
index 0000000000..45ff012711
--- /dev/null
+++ b/tests/qemuxml2argvdata/memfd-memory-default-hugepage.xml
@@ -0,0 +1,42 @@
+<domain type='kvm'>
+ <name>instance-00000092</name>
+ <uuid>126f2720-6f8e-45ab-a886-ec9277079a67</uuid>
+ <memory unit='KiB'>14680064</memory>
+ <currentMemory unit='KiB'>14680064</currentMemory>
+ <memoryBacking>
+ <hugepages/>
+ <source type='memfd'/>
+ <access mode='shared'/>
+ <allocation mode='immediate'/>
+ </memoryBacking>
+ <vcpu placement='static'>8</vcpu>
+ <numatune>
+ <memnode cellid='0' mode='preferred' nodeset='3'/>
+ </numatune>
+ <os>
+ <type arch='x86_64' machine='pc-i440fx-wily'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <cpu>
+ <topology sockets='1' cores='8' threads='1'/>
+ <numa>
+ <cell id='0' cpus='0-7' memory='14680064' unit='KiB'/>
+ </numa>
+ </cpu>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-x86_64</emulator>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='virtio'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+ </memballoon>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 0c0dcae197..ae9b77eee6 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -3045,6 +3045,7 @@ mymain(void)
QEMU_CAPS_KVM);
DO_TEST_CAPS_LATEST("memfd-memory-numa");
+ DO_TEST_CAPS_LATEST("memfd-memory-default-hugepage");
DO_TEST("cpu-check-none", QEMU_CAPS_KVM);
DO_TEST("cpu-check-partial", QEMU_CAPS_KVM);
diff --git a/tests/qemuxml2xmloutdata/memfd-memory-default-hugepage.xml b/tests/qemuxml2xmloutdata/memfd-memory-default-hugepage.xml
new file mode 120000
index 0000000000..27d38522c2
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/memfd-memory-default-hugepage.xml
@@ -0,0 +1 @@
+../qemuxml2argvdata/memfd-memory-default-hugepage.xml
\ No newline at end of file
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 4b8b0db0c6..a17cbdb633 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -1171,6 +1171,9 @@ mymain(void)
DO_TEST("memfd-memory-numa",
QEMU_CAPS_OBJECT_MEMORY_MEMFD,
QEMU_CAPS_OBJECT_MEMORY_MEMFD_HUGETLB);
+ DO_TEST("memfd-memory-default-hugepage",
+ QEMU_CAPS_OBJECT_MEMORY_MEMFD,
+ QEMU_CAPS_OBJECT_MEMORY_MEMFD_HUGETLB);
DO_TEST("acpi-table", NONE);
--
2.21.0
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