linux-kernel - Re: Summary of LPC guest MSI discussion in Santa Fe

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Message-ID: <20161110151848.GE2078@8bytes.org>
Date:   Thu, 10 Nov 2016 16:18:48 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Don Dutile <ddutile@...hat.com>, Will Deacon <will.deacon@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Eric Auger <eric.auger@...hat.com>, eric.auger.pro@...il.com,
        marc.zyngier@....com, tglx@...utronix.de, jason@...edaemon.net,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        drjones@...hat.com, linux-kernel@...r.kernel.org,
        pranav.sawargaonkar@...il.com, iommu@...ts.linux-foundation.org,
        punit.agrawal@....com, diana.craciun@....com,
        benh@...nel.crashing.org, arnd@...db.de, jcm@...hat.com,
        dwmw@...zon.co.uk
Subject: Re: Summary of LPC guest MSI discussion in Santa Fe

On Wed, Nov 09, 2016 at 08:11:16PM +0000, Robin Murphy wrote:
> When we *are* in full control of the IOVA space, we just carve out what
> we can find as best we can - see iova_reserve_pci_windows() in
> dma-iommu.c, which isn't really all that different to what x86 does
> (e.g. init_reserved_iova_ranges() in amd-iommu.c).

Yeah, that code was actually written with a look at what the Intel
driver does. I don't really like that it goes over all resources and
reserves them individually (not only because it is not hotplug-safe).

I have to check whether there is a nice and generic way to find out the
root-bridge windows and just reserve them in the iova-space. That would
be easier and more reliable.


	Joerg