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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
Jean Guyader wrote: > On Fri, Aug 28, 2009 at 03:53:56AM -0400, Han, Weidong 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. >> >> 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.) >> > > Once we have those patch inside xen-unstable, I could commit the > patch we have for XCI to share the host keyboard/mouse with multiple > vms. Cool. That's very useful. Regards, Weidong > >> >> 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 >> >> > > Hi, > > Has those patch been tested with an intel IGD? > > Because I think they are some pieces missing: > - GMCH mapping in the guest. > - VID DID pt for the host bridge (for linux hvm guest). > - TOM pass through for winxp guest. > > Jean _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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