[AMD Official Use Only - General] > -----Original Message----- > From: gregkh@xxxxxxxxxxxxxxxxxxx <gregkh@xxxxxxxxxxxxxxxxxxx> > Sent: 14 October 2022 12:55 > To: Radovanovic, Aleksandar <aleksandar.radovanovic@xxxxxxx> > Cc: Jason Gunthorpe <jgg@xxxxxxxx>; Gupta, Nipun > <Nipun.Gupta@xxxxxxx>; Marc Zyngier <maz@xxxxxxxxxx>; Robin Murphy > <robin.murphy@xxxxxxx>; robh+dt@xxxxxxxxxx; > krzysztof.kozlowski+dt@xxxxxxxxxx; rafael@xxxxxxxxxx; > eric.auger@xxxxxxxxxx; alex.williamson@xxxxxxxxxx; cohuck@xxxxxxxxxx; > Gupta, Puneet (DCG-ENG) <puneet.gupta@xxxxxxx>; > song.bao.hua@xxxxxxxxxxxxx; mchehab+huawei@xxxxxxxxxx; > f.fainelli@xxxxxxxxx; jeffrey.l.hugo@xxxxxxxxx; saravanak@xxxxxxxxxx; > Michael.Srba@xxxxxxxxx; mani@xxxxxxxxxx; yishaih@xxxxxxxxxx; > will@xxxxxxxxxx; joro@xxxxxxxxxx; masahiroy@xxxxxxxxxx; > ndesaulniers@xxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux- > kbuild@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devicetree@xxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; okaya@xxxxxxxxxx; > Anand, Harpreet <harpreet.anand@xxxxxxx>; Agarwal, Nikhil > <nikhil.agarwal@xxxxxxx>; Simek, Michal <michal.simek@xxxxxxx>; git > (AMD-Xilinx) <git@xxxxxxx> > Subject: Re: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its > domain as parent > > Caution: This message originated from an External Source. Use proper > caution when opening attachments, clicking links, or responding. > > > On Fri, Oct 14, 2022 at 11:18:36AM +0000, Radovanovic, Aleksandar wrote: > > Anyway, I think we're straying off topic here, none of this is visible to the > kernel anyway. The question that we still need to answer is, are you OK with > the limitations I listed originally? > > What original limitations? Limitations with regards to MSI message configuration of a CDX device: 1) MSI write value is at most 16 useable bits 2) MSI address value must be the same across all vectors of a single CDX device This would be the (potentially IOMMU translated) I/O address of GITS_TRANSLATER. As long as that IOMMU translation is consistent across a single device, I think we should be OK. > This thread is crazy and complex and you need to > use your \n key more :) I do try, but the corporate mail client that we're stuck with seems to just merge everything back together. Sigh. > thanks, > > greg k-h
