Re: [Xen-devel] [PATCH v2 25/24] xl: Document VGA problems arising from lack of physmap dmop

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Oct 06, 2017 at 03:33:52PM +0100, Ian Jackson wrote:
> [ extra patch, following test report from Ross ]
> 
> Ross reports that stdvga guests do not work, and cirrus guests are
> slow, because qemu tries to do xc_domain_add_to_physmap.  We will need
> another dmop to fix this properly.
> 
> For now, document the problem.
> 
> Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
> Reported-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
> CC: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> CC: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> ---
>  docs/man/xl.cfg.pod.5.in | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/docs/man/xl.cfg.pod.5.in b/docs/man/xl.cfg.pod.5.in
> index 8446d43..46b5ae6 100644
> --- a/docs/man/xl.cfg.pod.5.in
> +++ b/docs/man/xl.cfg.pod.5.in
> @@ -2239,6 +2239,12 @@ For example, cdrom insert will fail.
>  
>  =item
>  
> +Domains with stdvga graphics cards to not work.
> +Domains with cirrus vga do work,
> +but there are performance problems with the vga console.
> +

I don't follow. Do you imply cirrus doesn't need add_to_physmap to
function?

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