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Re: [Qemu-devel] [RFC] Add virtual SDEI support in qemu
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From: |
Dave Martin |
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Subject: |
Re: [Qemu-devel] [RFC] Add virtual SDEI support in qemu |
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Date: |
Tue, 16 Jul 2019 09:30:50 +0100 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
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...
[...]
Cheers
---Dave