On 2012年09月18日 14:56, Gerd Hoffmann wrote: > Hi, > >>> Out of curiousity, though, why not populate the edid block at init? >>> Something like: >> I think we need runtime generation of EDID when supporting following cases; >> >> (a) terminal service >> -Assume that we use qemu-kvm and seabios/vgabios for Terminal service, (as >> same as Windows Server). >> -Thin client that run VNC client connect. >> -qemu may want to ask guest that new (virtual) display is connected and >> update its resolution. >> --qemu may trigger guest OS as if your note-PC triggered when connecting >> projector. >> --Guest OS request EDID of new (virtual) display >> -- seabios/vgabios ask qemu about preferable resolution. >> -- seabios/vgabios return EDID that offer resolution that is good for >> client. >> >> (b) vnc client resolution change >> - vnc client change its resolution. >> - qemu may ask guest OS refresh its resolution. >> - Seabios/vgabios report a preferred resolution as EDID. >> >> If we don't need such feature (in future), populating the edid block at init >> is ok. > I think we should populate at init time. > > BTW: a CONFIG_EDID would be nice.
I'd like to rework it (now doing...) to pupulation at init time. > >> As Gred suggest me, we can add bochs api that offer preferable resolution, >> and use it for >> above scenario, that may be great. > Indeed ... > >> I'm sorry I don't know how trigger guest os from host when VNC client >> connect >> or change its resolution. > ... but seabios doesn't need to worry about this. > > The usual way the (virtual) hardware signals such changes to the os is > to raise an interrupt, and the os gfx card driver handles it. No > seabios involved here. Even if seabios would handle the interrupt and > update the edid there would still be the problem that there simply is no > bios interface which seabios could use to inform the guest os. > > sea(vga)bios should just use what it finds at boot time and not worry > about any changes while the guest is running. If something changes > seabios will pick it up on the next reboot. Thanks for clarification. Best, Hiroshi _______________________________________________ SeaBIOS mailing list [email protected] http://www.seabios.org/mailman/listinfo/seabios
