qemu: Reorder shmem params nicely

Always format id first so that we don't need to do that twice in
different code paths.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

src/qemu/qemu_command.c

@@ -8518,13 +8518,15 @@ qemuBuildShmemDevLegacyStr(virDomainDefPtr def,
     }
 
     virBufferAddLit(&buf, "ivshmem");
+    virBufferAsprintf(&buf, ",id=%s", shmem->info.alias);
+
     if (shmem->size)
         virBufferAsprintf(&buf, ",size=%llum", shmem->size >> 20);
 
     if (!shmem->server.enabled) {
-        virBufferAsprintf(&buf, ",shm=%s,id=%s", shmem->name, shmem->info.alias);
+        virBufferAsprintf(&buf, ",shm=%s", shmem->name);
     } else {
-        virBufferAsprintf(&buf, ",chardev=char%s,id=%s", shmem->info.alias, shmem->info.alias);
+        virBufferAsprintf(&buf, ",chardev=char%s", shmem->info.alias);
         if (shmem->msi.enabled) {
             virBufferAddLit(&buf, ",msi=on");
             if (shmem->msi.vectors)

tests/qemuxml2argvdata/qemuxml2argv-shmem.args

@@ -17,19 +17,19 @@ QEMU_AUDIO_DRV=none \
 -no-acpi \
 -boot c \
 -usb \
--device ivshmem,shm=shmem0,id=shmem0,bus=pci.0,addr=0x3 \
--device ivshmem,size=128m,shm=shmem1,id=shmem1,bus=pci.0,addr=0x5 \
--device ivshmem,size=256m,shm=shmem2,id=shmem2,bus=pci.0,addr=0x4 \
--device ivshmem,size=512m,chardev=charshmem3,id=shmem3,bus=pci.0,addr=0x6 \
+-device ivshmem,id=shmem0,shm=shmem0,bus=pci.0,addr=0x3 \
+-device ivshmem,id=shmem1,size=128m,shm=shmem1,bus=pci.0,addr=0x5 \
+-device ivshmem,id=shmem2,size=256m,shm=shmem2,bus=pci.0,addr=0x4 \
+-device ivshmem,id=shmem3,size=512m,chardev=charshmem3,bus=pci.0,addr=0x6 \
 -chardev socket,id=charshmem3,path=/var/lib/libvirt/shmem-shmem3-sock \
--device ivshmem,size=1024m,chardev=charshmem4,id=shmem4,bus=pci.0,addr=0x7 \
+-device ivshmem,id=shmem4,size=1024m,chardev=charshmem4,bus=pci.0,addr=0x7 \
 -chardev socket,id=charshmem4,path=/tmp/shmem4-sock \
--device ivshmem,size=2048m,chardev=charshmem5,id=shmem5,msi=on,ioeventfd=off,\
+-device ivshmem,id=shmem5,size=2048m,chardev=charshmem5,msi=on,ioeventfd=off,\
 bus=pci.0,addr=0x8 \
 -chardev socket,id=charshmem5,path=/tmp/shmem5-sock \
--device ivshmem,size=4096m,chardev=charshmem6,id=shmem6,msi=on,vectors=16,\
+-device ivshmem,id=shmem6,size=4096m,chardev=charshmem6,msi=on,vectors=16,\
 bus=pci.0,addr=0x9 \
 -chardev socket,id=charshmem6,path=/tmp/shmem6-sock \
--device ivshmem,size=8192m,chardev=charshmem7,id=shmem7,msi=on,vectors=32,\
+-device ivshmem,id=shmem7,size=8192m,chardev=charshmem7,msi=on,vectors=32,\
 ioeventfd=on,bus=pci.0,addr=0xa \
 -chardev socket,id=charshmem7,path=/tmp/shmem7-sock