linux-kernel - Re: [PATCH v15 06/12] swiotlb: Use is_swiotlb_force

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Date:   Tue, 6 Jul 2021 12:14:16 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, heikki.krogerus@...ux.intel.com,
        thomas.hellstrom@...ux.intel.com, peterz@...radead.org,
        benh@...nel.crashing.org, joonas.lahtinen@...ux.intel.com,
        dri-devel@...ts.freedesktop.org, chris@...is-wilson.co.uk,
        grant.likely@....com, paulus@...ba.org,
        Frank Rowand <frowand.list@...il.com>, mingo@...nel.org,
        Stefano Stabellini <sstabellini@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>, mpe@...erman.id.au,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        bskeggs@...hat.com, linux-pci@...r.kernel.org,
        xen-devel@...ts.xenproject.org,
        Thierry Reding <treding@...dia.com>,
        intel-gfx@...ts.freedesktop.org, matthew.auld@...el.com,
        linux-devicetree <devicetree@...r.kernel.org>,
        Jianxiong Gao <jxgao@...gle.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        maarten.lankhorst@...ux.intel.com, airlied@...ux.ie,
        Dan Williams <dan.j.williams@...el.com>,
        linuxppc-dev@...ts.ozlabs.org, jani.nikula@...ux.intel.com,
        Rob Herring <robh+dt@...nel.org>, rodrigo.vivi@...el.com,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Claire Chang <tientzu@...omium.org>,
        boris.ostrovsky@...cle.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        jgross@...e.com, Nicolas Boichat <drinkcat@...omium.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Qian Cai <quic_qiancai@...cinc.com>,
        lkml <linux-kernel@...r.kernel.org>,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Jim Quinlan <james.quinlan@...adcom.com>, xypron.glpk@....de,
        Tom Lendacky <thomas.lendacky@....com>, bauerman@...ux.ibm.com
Subject: Re: [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for
 swiotlb data bouncing

Hi Will and Robin,

On 7/6/2021 10:06 AM, Will Deacon wrote:
> On Tue, Jul 06, 2021 at 04:39:11PM +0100, Robin Murphy wrote:
>> On 2021-07-06 15:05, Christoph Hellwig wrote:
>>> On Tue, Jul 06, 2021 at 03:01:04PM +0100, Robin Murphy wrote:
>>>> FWIW I was pondering the question of whether to do something along those
>>>> lines or just scrap the default assignment entirely, so since I hadn't got
>>>> round to saying that I've gone ahead and hacked up the alternative
>>>> (similarly untested) for comparison :)
>>>>
>>>> TBH I'm still not sure which one I prefer...
>>>
>>> Claire did implement something like your suggestion originally, but
>>> I don't really like it as it doesn't scale for adding multiple global
>>> pools, e.g. for the 64-bit addressable one for the various encrypted
>>> secure guest schemes.
>>
>> Ah yes, that had slipped my mind, and it's a fair point indeed. Since we're
>> not concerned with a minimal fix for backports anyway I'm more than happy to
>> focus on Will's approach. Another thing is that that looks to take us a
>> quiet step closer to the possibility of dynamically resizing a SWIOTLB pool,
>> which is something that some of the hypervisor protection schemes looking to
>> build on top of this series may want to explore at some point.
> 
> Ok, I'll split that nasty diff I posted up into a reviewable series and we
> can take it from there.

For what it's worth, I attempted to boot Will's diff on top of Konrad's 
devel/for-linus-5.14 and it did not work; in fact, I got no output on my 
monitor period, even with earlyprintk=, and I do not think this machine 
has a serial console.

Robin's fix does work, it survived ten reboots with no issues getting to 
X and I do not see the KASAN and slub debug messages anymore but I 
understand that this is not the preferred solution it seems (although 
Konrad did want to know if it works).

I am happy to test any further patches or follow ups as needed, just 
keep me on CC.

Cheers,
Nathan