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Re: [Qemu-arm] [RFC] Add virtual SDEI support in qemu

From: Marc Zyngier
Subject: Re: [Qemu-arm] [RFC] Add virtual SDEI support in qemu
Date: Tue, 16 Jul 2019 09:46:52 +0100
User-agent: Mozilla/5.0 (X11; Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2

On 16/07/2019 09:30, Dave Martin wrote:
> On Mon, Jul 15, 2019 at 02:48:49PM +0100, Mark Rutland wrote:
>> On Mon, Jul 15, 2019 at 02:41:00PM +0100, Dave Martin wrote:
> [...]
>>> So long as KVM_EXIT_HYPERCALL reports sufficient information so that
>>> userspace can identify the cause as an SMC and retrieve the SMC
>>> immediate field, this seems feasible.
>>> For its own SMCCC APIs, KVM exclusively uses HVC, so rerouting SMC to
>>> userspace shouldn't conflict.
>> Be _very_ careful here! In systems without EL3 (and without NV), SMC
>> UNDEFs rather than trapping to EL2. Given that, we shouldn't build a
>> hypervisor ABI that depends on SMC.
> Good point.  I was hoping that was all ancient history by now, but if
> not...

Unfortunately, XGene-1 is still a thing...

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

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