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Re: [RFC v2 00/14] Add SDEI support for arm64

From: Marc Zyngier
Subject: Re: [RFC v2 00/14] Add SDEI support for arm64
Date: Wed, 05 Feb 2020 13:15:59 +0000
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Hi Heyi,

On 2020-02-04 08:26, Heyi Guo wrote:
Update Marc's email address.

+cc Gavin as he is posting a RFC for ARM NMI.

Hi Marc,

Really sorry for missing to update your email address, for the initial
topic was raised long time ago and I forgot to update the Cc list in
the commit message of the patches.

Thanks Gavin for forwarding current discussion on ARM NMI to me.

For you said SDEI is "horrible", does it mean we'd better never
implement SDEI in virtual world? Or do you have any advice on how to
implement it?

My concern is that SDEI implies having EL3. EL3 not being virtualizable
with KVM, you end-up baking SDEI in *hardware*. Of course, this hardware
is actually software (it is QEMU), but this isn't the way it was intended.

It's not the first time we've done that (PSCI is another example), but the
logic behind SDEI looks much more invasive.

Jazz is not dead. It just smells funny...

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