From: Marc Zyngier <marc.zyngier@arm.com>
To: Dave Martin <Dave.Martin@arm.com>, Mark Rutland <mark.rutland@arm.com>
Cc: Guoheyi <guoheyi@huawei.com>,
qemu-arm@nongnu.org, qemu-devel@nongnu.org,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu
Subject: Re: [Qemu-devel] [RFC] Add virtual SDEI support in qemu
Date: Tue, 16 Jul 2019 09:46:52 +0100 [thread overview]
Message-ID: <c2de59be-eded-b846-fc4d-24348732016c@arm.com> (raw)
In-Reply-To: <20190716083050.GK2790@e103592.cambridge.arm.com>
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...
prev parent reply other threads:[~2019-07-16 8:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-13 9:53 [Qemu-devel] [RFC] Add virtual SDEI support in qemu Guoheyi
2019-07-15 13:41 ` Dave Martin
2019-07-15 13:48 ` Mark Rutland
2019-07-15 14:26 ` James Morse
2019-07-15 14:44 ` Mark Rutland
2019-07-16 8:47 ` Dave Martin
2019-07-19 1:49 ` Guoheyi
2019-07-16 8:30 ` Dave Martin
2019-07-16 8:46 ` Marc Zyngier [this message]
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