Commit 18f77fae authored by Stratos Psomadakis's avatar Stratos Psomadakis Committed by Guido Trotter

Document the vnet_hdr HV parameter for KVM

Document the vnet_hdr HV parameter for KVM in the gnt-instance man page.
Signed-off-by: default avatarStratos Psomadakis <>
Reviewed-by: default avatarGuido Trotter <>
parent 24121b74
......@@ -746,6 +746,19 @@ kvm\_path
Path to the userspace KVM (or qemu) program.
Valid for the KVM hypervisor.
This boolean option determines whether the tap devices used by the
KVM paravirtual nics (virtio-net) will get created with VNET_HDR
(IFF_VNET_HDR) support.
If set to false, it effectively disables offloading on the virio-net
interfaces, which prevents host kernel tainting and log flooding,
when dealing with broken or malicious virtio-net drivers.
It is set to ``true`` by default.
The ``-O (--os-parameters)`` option allows customisation of the OS
parameters. The actual parameter names and values depends on the OS
being used, but the syntax is the same key=value. For example, setting
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