public inbox for kvm@vger.kernel.org
 help / color / mirror / Atom feed
From: Nishank Trivedi <nishank.trivedi@netapp.com>
To: <kvm@vger.kernel.org>
Subject: pci passthrough error about insufficient iommu width
Date: Wed, 6 Aug 2014 14:22:48 -0700	[thread overview]
Message-ID: <53E29CA8.6070806@netapp.com> (raw)

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?

Thanks,
nt


             reply	other threads:[~2014-08-06 21:22 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-06 21:22 Nishank Trivedi [this message]
2014-08-06 21:31 ` pci passthrough error about insufficient iommu width Alex Williamson
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=53E29CA8.6070806@netapp.com \
    --to=nishank.trivedi@netapp.com \
    --cc=kvm@vger.kernel.org \
    /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