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

From: David Kiarie
Subject: Re: [Qemu-devel] [V9 0/4] AMD IOMMU
Date: Wed, 4 May 2016 10:05:06 +0300

On Wed, May 4, 2016 at 9:12 AM, Jan Kiszka <address@hidden> wrote:
> 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.

This means you're invalidating DTEs ?

> 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.
> Jan

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