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@xxxxxxxxxx>
---
src/qemu/qemu_alias.c | 9 +++-
src/qemu/qemu_command.c | 12 ++++-
...mory-hotplug-virtio-mem.x86_64-latest.args | 49 +++++++++++++++++++
tests/qemuxml2argvtest.c | 1 +
4 files changed, 68 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 1a330829a3..cef02ae916 100644
--- a/src/qemu/qemu_alias.c
+++ b/src/qemu/qemu_alias.c
@@ -475,8 +475,11 @@ qemuDeviceMemoryGetAliasID(virDomainDefPtr 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++) {
@@ -523,6 +526,8 @@ qemuAssignDeviceMemoryAlias(virDomainDefPtr 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 9754cff61d..ba6e149e27 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3150,7 +3150,9 @@ qemuBuildMemoryBackendProps(virJSONValuePtr *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. */
@@ -3379,6 +3381,9 @@ 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:
@@ -3395,6 +3400,11 @@ 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..85aa3c4555
--- /dev/null
+++ b/tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args
@@ -0,0 +1,49 @@
+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 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 memory-backend-ram,id=ram-node0,size=2145386496 \
+-numa node,nodeid=0,cpus=0-1,memdev=ram-node0 \
+-object 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 memory-backend-file,id=memvirtiomem1,\
+mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,size=2147483648,\
+host-nodes=1-3,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 29054ba168..b421e00559 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -3163,6 +3163,7 @@ mymain(void)
QEMU_CAPS_DEVICE_NVDIMM,
QEMU_CAPS_LAST);
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,
--
2.26.2
