From: Konrad Rzeszutek Wilk <konrad@darnok.org>
To: Halil Pasic <pasic@linux.ibm.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
Nathan Chancellor <nathan@kernel.org>,
Vasily Gorbik <gor@linux.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Heiko Carstens <hca@linux.ibm.com>,
stable@vger.kernel.org, Claire Chang <tientzu@chromium.org>,
Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>,
Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v2 1/1] s390/pv: fix the forcing of the swiotlb
Date: Fri, 23 Jul 2021 20:27:56 -0400 [thread overview]
Message-ID: <YPtejB62iu+iNrM+@fedora> (raw)
In-Reply-To: <20210723231746.3964989-1-pasic@linux.ibm.com>
On Sat, Jul 24, 2021 at 01:17:46AM +0200, Halil Pasic wrote:
> Since commit 903cd0f315fe ("swiotlb: Use is_swiotlb_force_bounce for
> swiotlb data bouncing") if code sets swiotlb_force it needs to do so
> before the swiotlb is initialised. Otherwise
> io_tlb_default_mem->force_bounce will not get set to true, and devices
> that use (the default) swiotlb will not bounce despite switolb_force
> having the value of SWIOTLB_FORCE.
>
> Let us restore swiotlb functionality for PV by fulfilling this new
> requirement.
>
> This change addresses what turned out to be a fragility in
> commit 64e1f0c531d1 ("s390/mm: force swiotlb for protected
> virtualization"), which ain't exactly broken in its original context,
> but could give us some more headache if people backport the broken
> change and forget this fix.
>
> Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
> Fixes: 903cd0f315fe ("swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing")
> Fixes: 64e1f0c531d1 ("s390/mm: force swiotlb for protected virtualization")
> Cc: stable@vger.kernel.org #5.3+
>
> ---
Picked it up and stuck it in linux-next with the other set of patches (Will's fixes).
next prev parent reply other threads:[~2021-07-24 0:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-23 23:17 [PATCH v2 1/1] s390/pv: fix the forcing of the swiotlb Halil Pasic
2021-07-24 0:27 ` Konrad Rzeszutek Wilk [this message]
2021-07-26 15:25 ` Halil Pasic
2021-07-27 12:54 ` Christian Borntraeger
2021-07-27 12:57 ` Will Deacon
2021-07-27 13:00 ` Christian Borntraeger
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