From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/2] vfio: Allow No-IOMMU mode without checking iommu_present()
Date: Thu, 20 Jul 2017 10:19:10 +0100 [thread overview]
Message-ID: <20170720091909.GC17837@arm.com> (raw)
In-Reply-To: <1500525154-5200-2-git-send-email-anup.patel@broadcom.com>
On Thu, Jul 20, 2017 at 10:02:33AM +0530, Anup Patel wrote:
> Not allowing No-IOMMU mode for devices already having
> iommu_ops on their bus is very conservative.
>
> We now have IOMMU (such as ARM SMMU) which can bypass
> transcations when IOMMU is not configured for a given
> device. In addition, it is not necessary to have all
> devices on bus to be upstream to an IOMMU on that bus.
How does the SMMU know to bypass in these cases? As I explained before, the
driver-specific command line option is the wrong way to go about arranging
this.
Will
next prev parent reply other threads:[~2017-07-20 9:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-20 4:32 [PATCH v2 0/2] FlexRM support in VFIO platform Anup Patel
2017-07-20 4:32 ` [PATCH v2 1/2] vfio: Allow No-IOMMU mode without checking iommu_present() Anup Patel
2017-07-20 9:19 ` Will Deacon [this message]
2017-07-24 17:24 ` Alex Williamson
2017-07-20 4:32 ` [PATCH v2 2/2] vfio: platform: reset: Add Broadcom FlexRM reset module Anup Patel
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