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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [PATCH 0/2] graphics passthrough with VT-d
Andrew Lyon wrote: > On Fri, Aug 28, 2009 at 8:53 AM, Han, Weidong<weidong.han@xxxxxxxxx> > wrote: >> Hi all, >> >> Recently, more and more people are interesting in gfx passthrough. >> But now xen-unstable doesn't support it, although some guys (Jean >> Guyader, Beng Heng, Ng) posted gfx passthrough patches. If >> xen-unstable includes gfx passthrough support, people can be easy to >> try it. >> >> gfx passthrough is more complicated than other PCI device >> passthrough such as NIC, and is hard to use a generic approach for >> all gfx passthrough. But there are some necessary changes for gfx >> passthrough: >> 1. disable emulated VGA adapter, instead use passthroughed gfx >> 2. load VGA bios of the gfx to guest >> 3. passthrough legacy VGA IO ports and MMIOs to guest >> >> This patchset implements above common changes. Based on the common >> changes, we are investigating to support more gfx cards and guest >> OSs. We will post the hacks in future. >> >> The patchset supports to passthrough the primary gfx and discrete >> gfx. With the patchset, virtualization friendly gfx cards can be >> passthroughed (e.g. Nvidia FX3800), IGD and many discrete gfx cards >> are not supported yet. > > What about cheaper cards in the FX range like the FX580 or FX1800, are > they likely to be passthrough friendly? I don't know. We didn't try those cards. You can try with our patch by yourself. > > Perhaps we should ask nvidia exactly which cards support > virtualization, or is it a feature that is listed in the tech specs?, No. we just find it works with the common changes. Actually, its VGA bios re-execution doesn't works well. Regards, Weidong > I could probably run to one of the cheaper FX cards but the high end > ones are way too expensive for me to justify the cost. > > Andy > >> >> This is easy to use, the only difference from other PCI passthrough >> is to add following lines to hvm configure file: >> >> #---------------------------------------------------------------------------------------- >> # 0: no gfx passthru, 1: IGD passthru, 2: discrete gfx passthru, >> default is 0 >> gfx_passthru=2 >> >> and also pls passthrough a USB controller for keyboard/mouse use in >> guest. (Now there are some issues on USB controller passthrough with >> pv-ops dom0, so currently prefer to use 2.6.18 dom0.) >> >> >> The patchset is as follows: >> 1. PATCH 1/2: changes in xen-unstable >> - retrieves VGA bios from host VGA BIOS address (0xC0000), >> then load it to guest VGA BIOS address (This is the same with XCI). >> - Enlarge guest MMIO range to contain gfx card's large memory >> - add a config option 'gfx_passthru' for gfx passthrough >> >> 2. PATCH 2/2: changes in QEMU >> - disable emulated VGA adapter >> - register/unregister legacy VGA I/O ports and MMIOs >> >> >> Signed-off-by: Ben Lin <ben.y.lin@xxxxxxxxx> >> Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx> >> _______________________________________________ >> Xen-devel mailing list >> Xen-devel@xxxxxxxxxxxxxxxxxxx >> http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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