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RE: [Xen-devel] AMD iommu , pci passthrough problems assigning devices t

To: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>, "Huang2, Wei" <Wei.Huang2@xxxxxxx>
Subject: RE: [Xen-devel] AMD iommu , pci passthrough problems assigning devices to HVM
From: "Rose, Gregory V" <gregory.v.rose@xxxxxxxxx>
Date: Tue, 10 Aug 2010 13:51:31 -0700
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Cc: "Wang2, Wei" <Wei.Wang2@xxxxxxx>, "Przywara, Andre" <Andre.Przywara@xxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] AMD iommu , pci passthrough problems assigning devices to HVM
In your device 0b.0 I see this:

                ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ 
EgressCtrl- DirectTrans+
                ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd- 
EgressCtrl- DirectTrans-

So it looks to me as if the device is ACS capable but that the capability is 
not turned on?

I think every device in the path has to be ACS capable and the capability 

- Greg Rose
Intel Corp.

>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
>bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Sander Eikelenboom
>Sent: Tuesday, August 10, 2010 5:26 AM
>To: Huang2, Wei
>Cc: Wang2, Wei; Przywara, Andre; Joerg Roedel; xen-
>Subject: [Xen-devel] AMD iommu , pci passthrough problems assigning
>devices to HVM
>I'm running a machine with:
>- Hypervisor: xen-unstable
>- Dom0: xen/next-  commit
>-MSI 890FXA-GD70 with AMD IOMMU
>-Phenom X6
>I'm trying to do PCI passthrough to a HVM, this fails with:
>Error: Failed to assign device to IOMMU
>Error: pci: to avoid potential security issue, 0000:08:00.0 is not
>allowed to be assigned to guest since it is behind PCIe switch that does
>not support or enable ACS.
>I have found this thread
>https://bugzilla.redhat.com/show_bug.cgi?id=526713 regarding the ACS
>problem, which says the pci bridges need these capabilities:
>        ScrValid+, ReqRedir+, CmpltRedir+, and UpstreamFwd+
>When i do a lspci -vvv on my system i see these capabilities, but i do
>see some disturbing debug message on boot when amd_iommu_debug is on.
>- xm info
>- xm dmesg (booted with amd_iommu_debug on)
>- dmesg
>- lspci -vvv

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