[libvirt PATCH] util: tell users that memory locking ulimit is too low for BPF

[Pavel Hrdina]

On Tue, Mar 16, 2021 at 05:06:33PM +0000, Daniel P. Berrangé wrote:
> If running libvirtd via systemd, it gets a 64 MB memlock limit, but if
> running from the shell it will only get 64 KB on a Fedora 33 system.
> The latter low limit causes any attempt to use BPF to fail and it is
> not obvious why.
> 
> This improves the error message thus:
> 
>   # virsh -c lxc:/// start sh
> error: Failed to start domain 'sh'
> error: internal error: guest failed to start: Failure in libvirt_lxc startup: failed to initialize device BPF map; locked memory limit for libvirtd probably needs to be raised: Operation not permitted
> 
> Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
> ---
>  src/util/vircgroupv2devices.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)

Reviewed-by: Pavel Hrdina <phrdina at redhat.com>
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