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Re: [Qemu-devel] [PATCH 5/5] intel_iommu: do not allow EIM without KVM s


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 5/5] intel_iommu: do not allow EIM without KVM support
Date: Fri, 23 Sep 2016 12:03:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0


On 23/09/2016 12:02, Peter Xu wrote:
> On Fri, Sep 23, 2016 at 11:27:09AM +0200, Paolo Bonzini wrote:
>> > Since the whole IOMMU feature is new and somewhat experimental, I think
>> > it's okay to just make EIM the default for >=2.8 machine types if KVM is
>> > on (using DEFINE_PROP_ON_OFF_AUTO; auto means true if KVM is on and
>> > false otherwise, and pc-2.7 would set eim=off). It means requiring
>> > kernel 4.8 by default, but I don't think it's a big deal.
> I think the problem is, even we have KVM support for x2apic, we are
> still losing QEMU part. And guests with cluster x2apic and >8 vcpus
> will not working properly on device interrupts, which can be very
> confusing to people (it can boot, but some devices just don't work
> properly, and they won't see useful information in guest dmesg).

Yes, that's why I suggested EIM=on by default.

Paolo



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