>>> On 05.02.16 at 12:30, <roger....@citrix.com> wrote: > El 5/2/16 a les 11:40, Jan Beulich ha escrit: >>>>> On 05.02.16 at 10:50, <roger....@citrix.com> wrote: >>> For legacy PCI interrupts, we can parse the MADT inside of Xen in order >>> to properly setup the lines/overwrites and inject the interrupts that >>> are not handled by Xen straight into the hardware domain. This will >>> require us to be able to emulate the same topology as what is found in >>> native (eg: if there are two IO APICs in the hardware we should also >>> provide two emulated ones to the hw domain). >> >> I don't think MADT contains all the needed information, or else we >> wouldn't need PHYSDEVOP_setup_gsi. > > AFAICT, I think we could do something like: > > - IRQs [0, 15]: edge-trigger, low-polarity. > - IRQs [16, n]: level-triggered, high-polarity.
That's not a valid assumption - I've seen systems with other settings on GSI >= 16 ... > Unless there's an overwrite in the MADT. ... and iirc that was without any MADT override (but instead coming from the DSDT/SSDT). > I expect that Xen will already have some code to deal with this, since > it's also used for regular PCI-passthrough. This has little to do with pass-through - we first of all need to get the host working correctly on its own. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
