From: Alex Williamson <alex.williamson@redhat.com>
To: Nishank Trivedi <nishank.trivedi@netapp.com>
Cc: kvm@vger.kernel.org
Subject: Re: pci passthrough error about insufficient iommu width
Date: Wed, 06 Aug 2014 15:31:29 -0600 [thread overview]
Message-ID: <1407360689.316.182.camel@ul30vt.home> (raw)
In-Reply-To: <53E29CA8.6070806@netapp.com>
On Wed, 2014-08-06 at 14:22 -0700, Nishank Trivedi wrote:
> Hi
>
> I'm trying to do a pci-passthrough of Intel 82599 10GbE card, with guest
> having 8G of memory. I see following error -
>
> intel_iommu_map: iommu width (48) is not sufficient for the mapped
> address (fffffffffe001000)
> kvm_iommu_map_address:iommu failed to map pfn=45800
>
> I checked IOMMU capability register and SAGAW as well as MGAW are 48bits
> for both IOMMU.
>
> # dmesg | grep ecap
> dmar: IOMMU 0: reg_base_addr dfff0000 ver 1:0 cap d2078c106f0462 ecap f020fe
> dmar: IOMMU 1: reg_base_addr bfff0000 ver 1:0 cap d2078c106f0462 ecap f020fe
>
> # cat /proc/cpuinfo | grep "address sizes"
> address sizes : 46 bits physical, 48 bits virtual
>
> In DMAR table, I see host address width set to "2D", i.e. 46bit, which
> is ok as it is same as physical address size. Any suggestions on what
> might be going wrong here?
Try vfio-pci instead of pci-assign
next prev parent reply other threads:[~2014-08-06 21:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-06 21:22 pci passthrough error about insufficient iommu width Nishank Trivedi
2014-08-06 21:31 ` Alex Williamson [this message]
2014-08-06 21:49 ` William Tu
2014-08-07 6:12 ` Nishank Trivedi
2014-08-07 15:02 ` Alex Williamson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1407360689.316.182.camel@ul30vt.home \
--to=alex.williamson@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=nishank.trivedi@netapp.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox