[virt-tools-list] "Grey-out" Filesystem add hardware option in virt-manager in RHEL7.1 - kernel 3.10.0-229.11.1.el7.x86_64

[Cole Robinson]

On 09/02/2015 01:53 PM, Sorrillo, Lawrence wrote:
> Hello,
> 
>  
> 
> I was wondering about virt-manager support for the file-sharing option between
> host and guest in RedHat, CentOS and Fedora.
> 
>  
> 
> This appears to be grey out and a complaint about the inability of the
> installed combination of
> 
> libvirt and qemu to support this option is displayed. The link below shows the
> virt-manager screen 
> 
> WITHOUT the grey-out filesystem option.
> 
>  
> 
> http://www.linux-kvm.org/page/9p_virtio
> 
>  
> 
> For redhat based linuxes though this appears to be always greyed out in stock
> builds(even without 9p
> 
> and even when Qemu supports the file sharing option). Why is this?
> 
>  
> 
> [root at xxx tmp]# qemu-kvm --version
> 
> *QEMU emulator version 1.5.3 (qemu-kvm-1.5.3-86.el7_1.5), Copyright (c)
> 2003-2008 Fabrice Bellard*
> 
> [root at xxx tmp]# qemu-kvm --help | grep fsdev
> 
> *-fsdev
> fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]*
> 
> [root at xxx tmp]#  tmp]#
> 
> root at xxx   tmp]#
> 
> [root at xxx    tmp]# rpm -qa | grep libvirt-1.2.8
> 
> *libvirt-1.2.8-16.el7_1.3.x86_64*
> 
> [root at xxx  tmp]#

It's likely disabled/greyed-out on RHEL because on RHEL Red Hat explicitly
doesn't support filesystem passthrough for various maintenance and business
reasons. I think even if you attached the XML to your libvirt config, qemu
would fail to start because it's compiled out, but I haven't verified.

- Cole