From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Thiago Jung Bauermann <bauerman@linux.ibm.com>,
iommu@lists.linux-foundation.org
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Christoph Hellwig <hch@lst.de>,
Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>,
Robin Murphy <robin.murphy@arm.com>,
Ram Pai <linuxram@us.ibm.com>,
linuxppc-dev@lists.ozlabs.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory
Date: Thu, 17 Sep 2020 21:27:15 +1000 (AEST) [thread overview]
Message-ID: <160034200698.3339803.12661483575080905618.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20200818221126.391073-1-bauerman@linux.ibm.com>
On Tue, 18 Aug 2020 19:11:26 -0300, Thiago Jung Bauermann wrote:
> POWER secure guests (i.e., guests which use the Protection Execution
> Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but
> they don't need the SWIOTLB memory to be in low addresses since the
> hypervisor doesn't have any addressing limitation.
>
> This solves a SWIOTLB initialization problem we are seeing in secure guests
> with 128 GB of RAM: they are configured with 4 GB of crashkernel reserved
> memory, which leaves no space for SWIOTLB in low addresses.
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory
https://git.kernel.org/powerpc/c/eae9eec476d13fad9af6da1f44a054ee02b7b161
cheers
prev parent reply other threads:[~2020-09-17 12:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-18 22:11 [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory Thiago Jung Bauermann
2020-08-19 4:43 ` Christoph Hellwig
2020-08-19 16:50 ` Thiago Jung Bauermann
2020-08-20 2:12 ` Michael Ellerman
2020-08-19 17:00 ` Konrad Rzeszutek Wilk
2020-08-19 19:48 ` Thiago Jung Bauermann
2020-09-17 11:27 ` Michael Ellerman [this message]
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