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Re: [Qemu-devel] [PATCH 2/6] x86_iommu/amd: Prepare for interrupt remap

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 2/6] x86_iommu/amd: Prepare for interrupt remap support
Date: Thu, 13 Sep 2018 16:47:38 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 13/09/2018 10:15, Suravee Suthikulpanit wrote:
> However, if you prefer to keep this option,
> we probably should rename this to "intremap_sup", in which if the
> default value should be 1.

The main reason to have the property and to leave it off by default is
that it is incompatible with kernel_irqchip=split.  A second reason is
migration support, where you would be able to migrate from QEMU 3.1 to
3.0 and interrupt remapping would disappear.

It's okay to call the property just "intremap" even if it's ultimately
the guest's call to use it.  It's the same for e.g. a PCI device's MSI
support, properties for that are called just "msi" or "msix".



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