From: Bjorn Helgaas <helgaas@kernel.org>
To: Eric Pilmore <epilmore@gigaio.com>
Cc: linux-pci@vger.kernel.org, dmaengine@vger.kernel.org,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: IOVA address range
Date: Mon, 30 Oct 2023 13:19:25 -0500 [thread overview]
Message-ID: <20231030181622.GA1878727@bhelgaas> (raw)
In-Reply-To: <CAOQPn8uAWqR+0Qpk+Ua8gria06xx99ge5MnCGi4MwPOZNaXBvw@mail.gmail.com>
[+cc folks from ./scripts/get_maintainer.pl -f drivers/iommu]
On Fri, Oct 27, 2023 at 12:17:17PM -0700, Eric Pilmore wrote:
> Need a little IOVA/IOMMU help.
>
> Is it correct that the IOVA address range for a device goes from
> address 0x0 up to the dma-mask of the respective device?
>
> Is it correct to assume that the base of the IOVA address space for a
> device will always be zero (0x0)? Is there any reason to think that
> this has changed in some newer iteration of the kernel, perhaps 5.10,
> and that the base could be non-zero?
>
> I realize an IOVA itself can be non-zero. I'm trying to verify what
> the base address is of the IOVA space as a whole on a per device
> basis.
>
> Thanks,
> Eric Pilmore
next prev parent reply other threads:[~2023-10-30 18:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-27 19:17 IOVA address range Eric Pilmore
2023-10-30 18:19 ` Bjorn Helgaas [this message]
2023-10-31 11:46 ` Robin Murphy
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