linux-kernel - RE: [PATCH v3 00/15] iommu: Retire bus_set

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Date:   Thu, 21 Jul 2022 07:17:53 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Robin Murphy <robin.murphy@....com>,
        "joro@...tes.org" <joro@...tes.org>
CC:     "will@...nel.org" <will@...nel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "vasant.hegde@....com" <vasant.hegde@....com>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "gerald.schaefer@...ux.ibm.com" <gerald.schaefer@...ux.ibm.com>,
        "schnelle@...ux.ibm.com" <schnelle@...ux.ibm.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 00/15] iommu: Retire bus_set_iommu()

> From: Robin Murphy <robin.murphy@....com>
> Sent: Friday, July 15, 2022 9:13 PM
> 
> On 2022-07-05 18:08, Robin Murphy wrote:
> > v2: https://lore.kernel.org/linux-
> iommu/cover.1650890638.git.robin.murphy@....com/
> >
> > Hi all,
> >
> > Here's v3, now with working x86! Having finally made sense of how I
> > broke Intel, I've given AMD the same fix by inspection. I'm still not
> > 100% sure about s390, but it looks like it should probably be OK since
> > it seems to register an IOMMU instance for each PCI device (?!) before
> > disappearing into PCI hotplug code, wherein I assume we should never see
> > a PCI device appear without its IOMMU already registered.
> >
> > Otherwise, the only other updates are hooking up the new host1x context
> > bus (noting that it now takes all of 4 lines to support a whole new bus,
> > yay!), and a slight tweak to make sure we keep rejecting registration of
> > conflicting iommu_ops rather than needlessly change that just yet.
> 
> FWIW I've prepared v4, including Matt's s390 patch and some nice extra
> cleanups thanks to Kevin's suggestions, but have now decided to wait to
> rebase and send it after the upcoming merge window. If anyone's
> interested in the meantime, there's a preliminary branch here:
> 
> https://gitlab.arm.com/linux-arm/linux-rm/-/commits/bus-set-iommu-v4
> 
> (temporarily including the host1x patch from -next to avoid breakage on
> arm64 as well)
> 

This looks good to me.