From: Jason Gunthorpe <jgg@nvidia.com>
To: Will Deacon <will@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Jean-Philippe Brucker <jpb@kernel.org>,
Oded Gabbay <ogabbay@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org,
maz@kernel.org, oupton@kernel.org, hch@infradead.org
Subject: Re: [RFC PATCH v1 0/8] Arm Core Local Accelerator Driver
Date: Fri, 17 Jul 2026 10:32:00 -0300 [thread overview]
Message-ID: <20260717133200.GB699082@nvidia.com> (raw)
In-Reply-To: <aloS_T3LQvpHeZUV@willie-the-truck>
On Fri, Jul 17, 2026 at 12:33:17PM +0100, Will Deacon wrote:
> first. So, at the moment, this just looks like a burden to me, especially
> as it appears to create a brand new, device-specific UAPI for what is
> ostensibly a form of SVA - something which the community is actively
> working on already.
Yeah, I think it was a mistake to hardwire the invalidation to the
CPU. It would fit much better into Linux if the invalidation was
separate and independently controllable with an option to follow the
CPU.
Then you could use a normal S2 page table through iommufd and not mess
with kvm. (though the VMID sharing with KVM for a BTM-like scheme was
never solved upstream)
I also wouldn't expect you to use vfio-mdev, if the devices are
discovered and known at boot then it should be a normal vfio driver.
Jason
next prev parent reply other threads:[~2026-07-17 13:32 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-17 10:47 [RFC PATCH v1 0/8] Arm Core Local Accelerator Driver Ryan Roberts
2026-07-17 10:47 ` [RFC PATCH v1 1/8] misc/arm-cla: Add driver skeleton and documentation Ryan Roberts
2026-07-17 13:49 ` Arnd Bergmann
2026-07-17 15:44 ` Ryan Roberts
2026-07-17 16:10 ` Arnd Bergmann
2026-07-17 10:47 ` [RFC PATCH v1 2/8] misc/arm-cla: Add launch operation helpers Ryan Roberts
2026-07-17 12:16 ` Arnd Bergmann
2026-07-17 10:47 ` [RFC PATCH v1 3/8] misc/arm-cla: Probe firmware-described devices Ryan Roberts
2026-07-17 12:25 ` Arnd Bergmann
2026-07-17 12:36 ` Ryan Roberts
2026-07-17 10:47 ` [RFC PATCH v1 4/8] misc/arm-cla: Initialize devices on CPU bringup Ryan Roberts
2026-07-17 10:47 ` [RFC PATCH v1 5/8] misc/arm-cla: Accelerator context save and restore Ryan Roberts
2026-07-17 10:47 ` [RFC PATCH v1 6/8] misc/arm-cla: Set up memory translation context Ryan Roberts
2026-07-17 10:47 ` [RFC PATCH v1 7/8] misc/arm-cla: Manage domain contexts Ryan Roberts
2026-07-17 10:47 ` [RFC PATCH v1 8/8] misc/arm-cla: Add userspace interface Ryan Roberts
2026-07-17 12:54 ` Arnd Bergmann
2026-07-17 14:35 ` Ryan Roberts
2026-07-17 15:31 ` Arnd Bergmann
2026-07-17 16:21 ` Ryan Roberts
2026-07-17 11:33 ` [RFC PATCH v1 0/8] Arm Core Local Accelerator Driver Will Deacon
2026-07-17 12:09 ` Marc Zyngier
2026-07-17 12:33 ` Ryan Roberts
2026-07-17 12:30 ` Ryan Roberts
2026-07-17 13:32 ` Jason Gunthorpe [this message]
2026-07-17 13:42 ` Ryan Roberts
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