[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Problems when using latest git tree to boot xen on OMAP5
On Wed, 9 Oct 2013, Ian Campbell wrote: > On Wed, 2013-10-09 at 12:15 +0100, Julien Grall wrote: > > On 10/09/2013 09:11 AM, Ian Campbell wrote: > > > Rather than whitelisting and mapping disabled devices through perhaps we > > > should implement them as read 0xf (or 0x0) and write ignore? > > > > We can't assume that these values (0x0 or 0xf) won't affect dom0 behaviour. > > 0xff is what you would typically get back if there was no actual > hardware present. > > > What about a new quirk to map all disabled device in dom0 > > (PLATFORM_QUIRK_DOM0_MAP_DISABLED_DEVICE)? > > Why is this not the default behaviour? I think this is not a good idea: it prevents us from assigning one device directly to a domain other than dom0 from Xen at boot time (without going through something like PCI passthough). Also if we really don't want dom0 to use a device, it makes perfect sense that we don't map the device to it. I would rather introduce PLATFORM_QUIRK_DOM0_EMULATE_DISABLED_DEVICE and implement it with a simple write ignore, read 0xff. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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