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Re: [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing
 
- To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
 
- From: Will Deacon <will@xxxxxxxxxx>
 
- Date: Tue, 6 Jul 2021 17:57:21 +0100
 
- Cc: Christoph Hellwig <hch@xxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>,	heikki.krogerus@xxxxxxxxxxxxxxx, thomas.hellstrom@xxxxxxxxxxxxxxx,	peterz@xxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx,	joonas.lahtinen@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx,	chris@xxxxxxxxxxxxxxxxxx, grant.likely@xxxxxxx, paulus@xxxxxxxxx,	Frank Rowand <frowand.list@xxxxxxxxx>, mingo@xxxxxxxxxx,	Stefano Stabellini <sstabellini@xxxxxxxxxx>,	Saravana Kannan <saravanak@xxxxxxxxxx>, mpe@xxxxxxxxxxxxxx,	"Rafael J . Wysocki" <rafael.j.wysocki@xxxxxxxxx>,	Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>, bskeggs@xxxxxxxxxx,	linux-pci@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx,	Thierry Reding <treding@xxxxxxxxxx>,	intel-gfx@xxxxxxxxxxxxxxxxxxxxx, matthew.auld@xxxxxxxxx,	linux-devicetree <devicetree@xxxxxxxxxxxxxxx>,	Jianxiong Gao <jxgao@xxxxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>,	maarten.lankhorst@xxxxxxxxxxxxxxx, airlied@xxxxxxxx,	Dan Williams <dan.j.williams@xxxxxxxxx>,	linuxppc-dev@xxxxxxxxxxxxxxxx, jani.nikula@xxxxxxxxxxxxxxx,	Nathan Chancellor <nathan@xxxxxxxxxx>,	Rob Herring <robh+dt@xxxxxxxxxx>, rodrigo.vivi@xxxxxxxxx,	Bjorn Helgaas <bhelgaas@xxxxxxxxxx>,	Claire Chang <tientzu@xxxxxxxxxxxx>, boris.ostrovsky@xxxxxxxxxx,	Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>,	jgross@xxxxxxxx, Nicolas Boichat <drinkcat@xxxxxxxxxxxx>,	Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>,	Randy Dunlap <rdunlap@xxxxxxxxxxxxx>,	Qian Cai <quic_qiancai@xxxxxxxxxxx>,	lkml <linux-kernel@xxxxxxxxxxxxxxx>,	"list@xxxxxxx:IOMMU DRIVERS" <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>,	Jim Quinlan <james.quinlan@xxxxxxxxxxxx>, xypron.glpk@xxxxxx,	Tom Lendacky <thomas.lendacky@xxxxxxx>, bauerman@xxxxxxxxxxxxx
 
- Delivery-date: Tue, 06 Jul 2021 16:57:42 +0000
 
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
 
 
 
On Tue, Jul 06, 2021 at 10:46:07AM -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Jul 06, 2021 at 04:05:13PM +0200, 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.
> 
> Couple of things:
>  - I am not pushing to Linus the Claire's patchset until we have a
>    resolution on this. I hope you all agree that is a sensible way
>    forward as much as I hate doing that.
Sure, it's a pity but we could clearly use a bit more time to get these
just right and we've run out of time for 5.14.
I think the main question I have is how would you like to see patches for
5.15? i.e. as patches on top of devel/for-linus-5.14 or something else?
Cheers,
Will
 
 
    
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