linux-kernel - Re: Question about reserved

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Message-ID: <ZIyug9KX9VHCxe5i@nvidia.com>
Date:   Fri, 16 Jun 2023 15:48:35 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Baolu Lu <baolu.lu@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
Subject: Re: Question about reserved_regions w/ Intel IOMMU

On Fri, Jun 16, 2023 at 08:27:21AM -0700, Alexander Duyck wrote:

> > > The problem is that the user may not open all the devices then
> > > currently there is no way for it to know the windows on those
> > > unopened devices.
> > >
> > > Curious why nobody complains about this gap before this thread...
> >
> > Probably because it only matters if you have a real PCIe switch in the
> > system, which is pretty rare.
> 
> So just FYI I am pretty sure we have a partitioned PCIe switch that
> has FW issues.

Yeah, that is pretty common :(

But I think you've touched on a gap in the API.

Jason