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Re: [Qemu-devel] [V9 0/4] AMD IOMMU

From: Jan Kiszka
Subject: Re: [Qemu-devel] [V9 0/4] AMD IOMMU
Date: Wed, 4 May 2016 08:12:33 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2016-04-30 00:42, David Kiarie wrote:
> These series adds AMD IOMMU support to Qemu. It's currently in the 9th 
> version.
> In this series I have (hopefully) addressed all the comments made in the 
> previous version.
> I have also tested and successfully passed-through PCI device 'ac97' with 
> more devices to be tested.

I've done some basic testing with a Jailhouse setup and found it
working. The ACPI table is now properly parsed and the DMA remapping was
not disturbing the system after Jailhouse was activated.

However, it was also still not intervening after I started to corrupt
the configuration, removed DMA target properties from most of the RAM or
dropped PCI devices.

You are not dropping invalid remapping requests, are you? According to
the logs, you are detecting them at least:

(amd-iommu)amd_iommu_get_dte: Device Table at 0x3b0d4000
(amd-iommu)amd_iommu_get_dte: Pte entry at 0x0 is invalid
(amd-iommu)amd_iommu_translate: devid: 00:02.0 gpa 0x32f39480 hpa 0x32f39000

It's a bit hard to test right now if remapping is actually properly
working in all important cases if you do not reject invalid ones.


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