[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v9 12/14] tools/libxl: read from config if passing through primary GPU
Thursday, July 3, 2014, 12:30:13 PM, you wrote: >>>> On 02.07.14 at 21:00, <linux@xxxxxxxxxxxxxx> wrote: >> Wednesday, July 2, 2014, 8:42:21 PM, you wrote: >>> --- a/docs/man/xl.cfg.pod.5 >>> +++ b/docs/man/xl.cfg.pod.5 >>> @@ -601,6 +601,13 @@ More information about Xen gfx_passthru feature is >>> available >>> on the XenVGAPassthrough L<http://wiki.xen.org/wiki/XenVGAPassthrough> >>> wiki page. >>> >>> +=item B<gfx_passthru_primary=BOOLEAN> >>> + >>> +If set to true, indicates that one of the GPUs passed through to the >>> +domain is the primary one; therefore allows to the domain's stubdoman >>> +access permissions for the VGA framebuffer. Note that this option >>> +defaults to true. >>> + >> >> Wouldn't it make sense to make it a pci <BDF> instead of boolean, >> so that instead of: "one of the GPU's passed is the primary", >> you could actually specify: "this *specific* GPU passed through i would like >> to be the primary" ? > No. You can't just make some card primary (with "primary" really > meaning accessible via the legacy VGA interface). Within a host > there's exactly one card that can be primary. If that card gets > passed through, it can also be primary in the guest. Any other > card, not having the legacy VGA ports routed through the > corresponding circuitry, can't all of the sudden become the > primary one in a guest. Is that also true for a HVM guest ? - aren't the legacy VGA ports emulated without passthrough (by hvmloader / seabios, with the cirrus or stdvga) - couldn't they be rerouted to a device that is passed through ? Or would that make the VGA card do legacy stuff on the host instead of in the guest (since it's lowlevel legacy stuff) ? > Consequently this shouldn't be a config file setting, but something > that gets worked out by looking at the PCI config spaces of the > passed through card and eventual upstream bridges. > Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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