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Re: [Qemu-devel] [RFC] Add virtual SDEI support in qemu
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From: |
Marc Zyngier |
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Subject: |
Re: [Qemu-devel] [RFC] Add virtual SDEI support in qemu |
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Date: |
Tue, 16 Jul 2019 09:46:52 +0100 |
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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...
M.
--
Jazz is not dead. It just smells funny...