[PATCH v3 06/14] qemu: Build command line for virtio-mem
Michal Privoznik
mprivozn at redhat.com
Fri Apr 23 13:24:28 UTC 2021
Nothing special is happening here. All important changes were
done when for 'virtio-pmem' (adjusting the code to put virtio
memory on PCI bus, generating alias using
qemuDomainDeviceAliasIndex(). The only bit that might look
suspicious is no prealloc for virtio-mem. But if you think about
it, the whole purpose of this device is to change amount of
memory exposed to guest on the fly. There is no point in locking
the whole backend in memory.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/qemu/qemu_alias.c | 9 +++-
src/qemu/qemu_command.c | 12 +++++-
...mory-hotplug-virtio-mem.x86_64-latest.args | 41 +++++++++++++++++++
tests/qemuxml2argvtest.c | 1 +
4 files changed, 60 insertions(+), 3 deletions(-)
create mode 100644 tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args
diff --git a/src/qemu/qemu_alias.c b/src/qemu/qemu_alias.c
index e1caeec006..39a48f0e71 100644
--- a/src/qemu/qemu_alias.c
+++ b/src/qemu/qemu_alias.c
@@ -476,8 +476,11 @@ qemuDeviceMemoryGetAliasID(virDomainDef *def,
size_t i;
int maxidx = 0;
- /* virtio-pmem goes onto PCI bus and thus DIMM address is not valid */
- if (!oldAlias && mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM)
+ /* virtio-pmem and virtio-mem go onto PCI bus and thus DIMM address is not
+ * valid */
+ if (!oldAlias &&
+ mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM &&
+ mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM)
return mem->info.addr.dimm.slot;
for (i = 0; i < def->nmems; i++) {
@@ -524,6 +527,8 @@ qemuAssignDeviceMemoryAlias(virDomainDef *def,
prefix = "virtiopmem";
break;
case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM:
+ prefix = "virtiomem";
+ break;
case VIR_DOMAIN_MEMORY_MODEL_NONE:
case VIR_DOMAIN_MEMORY_MODEL_LAST:
default:
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 422efa22ab..065a8649c8 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3219,7 +3219,9 @@ qemuBuildMemoryBackendProps(virJSONValue **backendProps,
} else if (useHugepage) {
if (qemuGetDomainHupageMemPath(priv->driver, def, pagesize, &memPath) < 0)
return -1;
- prealloc = true;
+ /* For virtio-mem backed by hugepages we don't need prealloc. */
+ if (mem->model != VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM)
+ prealloc = true;
} else {
/* We can have both pagesize and mem source. If that's the case,
* prefer hugepages as those are more specific. */
@@ -3453,6 +3455,9 @@ qemuBuildMemoryDeviceStr(const virDomainDef *def,
break;
case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM:
+ device = "virtio-mem-pci";
+ break;
+
case VIR_DOMAIN_MEMORY_MODEL_NONE:
case VIR_DOMAIN_MEMORY_MODEL_LAST:
default:
@@ -3469,6 +3474,11 @@ qemuBuildMemoryDeviceStr(const virDomainDef *def,
if (mem->labelsize)
virBufferAsprintf(&buf, "label-size=%llu,", mem->labelsize * 1024);
+ if (mem->blocksize) {
+ virBufferAsprintf(&buf, "block-size=%llu,", mem->blocksize * 1024);
+ virBufferAsprintf(&buf, "requested-size=%llu,", mem->requestedsize * 1024);
+ }
+
if (mem->uuid) {
char uuidstr[VIR_UUID_STRING_BUFLEN];
diff --git a/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args b/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args
new file mode 100644
index 0000000000..16f10c14ad
--- /dev/null
+++ b/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args
@@ -0,0 +1,41 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-i386 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/tmp/lib/domain--1-QEMUGuest1/master-key.aes"}' \
+-machine pc,accel=kvm,usb=off,dump-guest-core=off \
+-cpu qemu64 \
+-m size=2095104k,slots=16,maxmem=1099511627776k \
+-overcommit mem-lock=off \
+-smp 2,sockets=2,dies=1,cores=1,threads=1 \
+-object '{"qom-type":"memory-backend-ram","id":"ram-node0","size":2145386496}' \
+-numa node,nodeid=0,cpus=0-1,memdev=ram-node0 \
+-object '{"qom-type":"memory-backend-ram","id":"memvirtiomem0","size":1073741824}' \
+-device virtio-mem-pci,node=0,block-size=2097152,requested-size=536870912,memdev=memvirtiomem0,id=virtiomem0,bus=pci.0,addr=0x2 \
+-object '{"qom-type":"memory-backend-file","id":"memvirtiomem1","mem-path":"/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1","size":2147483648,"host-nodes":[1,2,3],"policy":"bind"}' \
+-device virtio-mem-pci,node=0,block-size=2097152,requested-size=1073741824,memdev=memvirtiomem1,id=virtiomem1,bus=pci.0,addr=0x3 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-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 \
+-blockdev '{"driver":"host_device","filename":"/dev/HostVG/QEMUGuest1","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \
+-blockdev '{"node-name":"libvirt-1-format","read-only":false,"driver":"raw","file":"libvirt-1-storage"}' \
+-device ide-hd,bus=ide.0,unit=0,drive=libvirt-1-format,id=ide0-0-0,bootindex=1 \
+-audiodev id=audio1,driver=none \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-msg timestamp=on
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index f0efe98d7e..b5de93eccb 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -3228,6 +3228,7 @@ mymain(void)
QEMU_CAPS_LAST);
DO_TEST_CAPS_VER("memory-hotplug-virtio-pmem", "5.2.0");
DO_TEST_CAPS_LATEST("memory-hotplug-virtio-pmem");
+ DO_TEST_CAPS_LATEST("memory-hotplug-virtio-mem");
DO_TEST("machine-aeskeywrap-on-caps",
QEMU_CAPS_AES_KEY_WRAP,
--
2.26.3
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