[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [v5][PATCH 4/5] xen, gfx passthrough: create host bridge to passthrough
On 2014/7/1 3:42, Stefano Stabellini wrote: On Mon, 30 Jun 2014, Chen, Tiejun wrote:On 2014/6/29 20:14, Michael S. Tsirkin wrote:On Sun, Jun 29, 2014 at 03:56:10PM +0800, Chen, Tiejun wrote:On 2014/6/27 19:26, Paolo Bonzini wrote:Il 27/06/2014 10:34, Chen, Tiejun ha scritto:So how to separate this to specific to xen? Or you mean we need to create an new machine to address this scenario? But actually this is same as xenfv_machine except for these little codes.Yes, please create a new machine so that "-M pc" doesn't have any of these hacks.But regardless of the machine is 'xenfv' or 'pc', we always call pc_init_pci(), then inside, i440fx_init() is always performed. So I think even we create a new machine, shouldn't we still call pc_init_pci()?Note that "-M xenfv" is obsolete, Xen can now use "-M pc" (i.e. the default).Yes, Xen can use 'pc'. Thanks TiejunYou are creating a new machine type where the pci host looks like MCH but a bunch of other things are from i440fx.Anthony, Any comments to address this in xen case?Having a separate machine for this is reasonable. You can select the right one from libxl anyway. From the name point of view I would go with "xenigd". Do this mean we need to change something libxl? Just take a look at xenfv and introduce something similar but specific to your IGD PT use case. Which PCIe machine should I refer? i440fx or q35? Thanks Tiejun Thanks TiejunI have some doubts about this combination being worth supporting - it does not seem useful for anything except xen from the code you posted, but maybe you can whittle down the number of places where you poke at the host to make it reasonable: I can imagine that, if you are lucky and the registers that i915 wants to poke to make it work on real hardware happen to fall on top of reserved registers in the i440FX/PIIX3 pci bridge. OTOH it would be much more likely if you just start with something that does have MCH, like Q35, or emulate a newer machine type. This is the path that people who wanted to boot iOS on QEMU took, and the result is pretty good. But regardless, this is clearly not a i440fx nor a q35 pc so it needs a separate name. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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