From: Jason Gunthorpe <jgg@ziepe.ca>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev,
Robin Murphy <robin.murphy@arm.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Steven Price <steven.price@arm.com>,
Suzuki K Poulose <Suzuki.Poulose@arm.com>,
Jiri Pirko <jiri@resnulli.us>,
Mostafa Saleh <smostafa@google.com>,
Petr Tesarik <ptesarik@suse.com>,
Alexey Kardashevskiy <aik@amd.com>,
Xu Yilun <yilun.xu@linux.intel.com>,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Christophe Leroy <chleroy@kernel.org>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
x86@kernel.org
Subject: Re: [RFC PATCH] dma: swiotlb: Size shared default pools for memory encryption
Date: Wed, 12 Aug 2026 14:42:58 -0300 [thread overview]
Message-ID: <20260812174258.GF662699@ziepe.ca> (raw)
In-Reply-To: <anysnQFVTO_RAYxp@arm.com>
On Wed, Aug 12, 2026 at 06:25:49PM +0100, Catalin Marinas wrote:
> > > BTW, why does arm64 report CC_ATTR_MEM_ENCRYPT instead of the GUEST
> > > option in realms?
>
> It's still not clear to me why we went for CC_ATTR_MEM_ENCRYPT instead
> of CC_ATTR_GUEST_MEM_ENCRYPT.
Yeah, this tune should be only for CC guests that have the
shared/private issue.
The AMD SME issue with the address width on bare metal is an entirely
different problem that would need a different kind of tuning.
Jason
next prev parent reply other threads:[~2026-08-12 17:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-11 13:40 [RFC PATCH] dma: swiotlb: Size shared default pools for memory encryption Aneesh Kumar K.V (Arm)
2026-08-12 10:01 ` Catalin Marinas
2026-08-12 11:08 ` Aneesh Kumar K.V
2026-08-12 17:25 ` Catalin Marinas
2026-08-12 17:42 ` Jason Gunthorpe [this message]
2026-08-13 5:32 ` Aneesh Kumar K.V
2026-08-13 8:47 ` Catalin Marinas
2026-08-13 9:13 ` Aneesh Kumar K.V
2026-08-12 11:31 ` Aneesh Kumar K.V
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