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From: Robin Murphy <robin.murphy@arm.com>
To: Marc Gonzalez <marc.w.gonzalez@free.fr>,
	Will Deacon <will@kernel.org>,
	Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
	"Michael S. Tsirkin" <mst@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>, Will Deacon <will.deacon@arm.com>,
	Douglas Anderson <dianders@chromium.org>,
	Jon Hunter <jonathanh@nvidia.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2] iommu/arm-smmu: Break insecure users by disabling bypass by default
Date: Tue, 20 Aug 2019 15:10:06 +0100	[thread overview]
Message-ID: <88c31b09-4dea-a481-1775-cd4bebe13ca5@arm.com> (raw)
In-Reply-To: <ada29112-87c1-e223-aa66-b7871e20a49a@free.fr>

On 20/08/2019 14:55, Marc Gonzalez wrote:
> On 19/08/2019 16:48, Will Deacon wrote:
> 
>> If we can get by with extending the iommu-map entries for the masters,
>> that would certainly be the neatest imo. Sounds like it's worth a quick
>> hack, if nothing else.
> 
> Tangent: I've been meaning to ask about some iommu-map shenanigan.
> 
> My kernel reports:
> 
> 	OF: /soc/pci@1c00000: no iommu-map translation for rid 0x0 on (null)
> 
> Errr... "Is that a problem, doctor?"
> 
> It's a pr_info() message from of_map_rid() in drivers/of/base.c
> I note that it used to be an error before fb709b5e1cca5

It means your host bridge doesn't have a stream ID. Depending on how the 
root complex is wired up to the SMMU that may or may not be technically 
accurate, but either way if your host bridge ever starts doing DMA for 
itself then you should probably be more concerned with tracking down PCI 
SIG's exorcism spec.

Robin.

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  reply	other threads:[~2019-08-20 14:10 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-01 19:20 [PATCH v2] iommu/arm-smmu: Break insecure users by disabling bypass by default Douglas Anderson
2019-03-20 15:48 ` Marc Gonzalez
2019-03-20 18:35   ` Robin Murphy
2019-04-02 15:42 ` Marc Gonzalez
2019-04-04 15:00 ` Will Deacon
2019-04-24 11:36   ` Marc Gonzalez
2019-04-24 11:52     ` Will Deacon
2019-05-02 10:59       ` Thierry Reding
2019-05-02 11:08         ` Will Deacon
2019-05-02 12:45           ` Thierry Reding
2019-05-02 14:08             ` Will Deacon
2019-05-02 14:27             ` Robin Murphy
2019-08-19 11:28               ` Thierry Reding
2019-08-19 12:09                 ` Will Deacon
2019-08-19 13:33                   ` Thierry Reding
2019-08-19 14:48                     ` Will Deacon
2019-08-20 13:55                       ` Marc Gonzalez
2019-08-20 14:10                         ` Robin Murphy [this message]
2019-10-03 18:27 ` Tim Harvey
2019-10-03 20:42   ` Robin Murphy
2019-10-03 20:51     ` Tim Harvey
2019-10-03 22:24       ` Robin Murphy
2019-10-04 15:23         ` Tim Harvey
2019-10-04 16:36           ` Robin Murphy
2019-10-04 17:13             ` Tim Harvey
2019-10-04 18:34               ` Robin Murphy
2019-10-04 20:37                 ` Tim Harvey
2019-10-04 23:27                   ` Robin Murphy
2019-10-24 16:56                     ` Tim Harvey

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