pvecm: followup: rewrap lines to 80 cc

[pve-docs.git] / qm.adoc

diff --git a/qm.adoc b/qm.adoc
index 30e473f9925757d9294d170537a5a90d730a6dfc..4f9ae15f9710102bbae15da40154fc733d0f75a7 100644 (file)
--- a/qm.adoc
+++ b/qm.adoc
@@ -484,7 +484,7 @@ host.
 .Fixed Memory Allocation
 [thumbnail="screenshot/gui-create-vm-memory.png"]
 
-When setting memory and minimum memory to the same amount
+ghen setting memory and minimum memory to the same amount
 {pve} will simply allocate what you specify to your VM.
 
 Even when using a fixed memory size, the ballooning device gets added to the
@@ -703,6 +703,29 @@ you need to set the client resolution in the OVMF menu(which you can reach
 with a press of the ESC button during boot), or you have to choose
 SPICE as the display type.
 
+[[qm_ivshmem]]
+Inter-VM shared memory
+~~~~~~~~~~~~~~~~~~~~~~
+
+You can add an Inter-VM shared memory device (`ivshmem`), which allows one to
+share memory between the host and a guest, or also between multiple guests.
+
+To add such a device, you can use `qm`:
+
+  qm set <vmid> -ivshmem size=32,name=foo
+
+Where the size is in MiB. The file will be located under
+`/dev/shm/pve-shm-$name` (the default name is the vmid).
+
+NOTE: Currently the device will get deleted as soon as any VM using it got
+shutdown or stopped. Open connections will still persist, but new connections
+to the exact same device cannot be made anymore.
+
+A use case for such a device is the Looking Glass
+footnote:[Looking Glass: https://looking-glass.hostfission.com/] project,
+which enables high performance, low-latency display mirroring between
+host and guest.
+
 [[qm_startup_and_shutdown]]
 Automatic Start and Shutdown of Virtual Machines
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~