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Re: [Qemu-devel] [PATCH v2 5/8] x86_iommu/amd: Add interrupt remap suppo

From: Singh, Brijesh
Subject: Re: [Qemu-devel] [PATCH v2 5/8] x86_iommu/amd: Add interrupt remap support when VAPIC is not enabled
Date: Tue, 18 Sep 2018 20:31:26 +0000

Small correction

On 09/18/2018 03:27 PM, Singh, Brijesh wrote:>
> So far non of the guests were enabling the interrupt remap features
> even when it was available. As I explained in previous patches (see
> patch 6), Linux guest looks for a special IOAPIC device in IVHD before
> enabling the interrupt remap. If you enable the amd_iommu_debug=1
> in kernel cmdline then kernel bootup prints the message that its
> attempting to enable the IR but since IOAPIC entry does not exist
> in IVHD hence it disabled it.
> Notes: for kicks you can apply patch 6 from this series in existing
> code base and you will see that Linux OS will enable the IR (it does
> care about intremap=<on|off> from amd-iommu.

I was meaning to say (it does *not* care about  intremap=...)

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