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Date: Mon, 29 Sep 2014 12:48:15 +0200
From: Jan Kiszka <jan.kiszka@siemens.com>
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Subject: Re: [Qemu-devel] [PATCH v7 00/11] target-arm: Parts of the AArch64
 EL2/3 exception model
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Rob Herring <rob.herring@linaro.org>, Peter Crosthwaite <peter.crosthwaite@xilinx.com>, Fabian Aggeler <aggelerf@ethz.ch>, Greg Bellows <greg.bellows@linaro.org>, QEMU Developers <qemu-devel@nongnu.org>, Alexander Graf <agraf@suse.de>, Paolo Bonzini <pbonzini@redhat.com>, Sergey Fedorov <serge.fdrv@gmail.com>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, =?UTF-8?B?QWxleCBCZW5uw6ll?= <alex.bennee@linaro.org>, Christoffer Dall <christoffer.dall@linaro.org>, Richard Henderson <rth@twiddle.net>

On 2014-09-29 12:41, Peter Maydell wrote:
> On 29 September 2014 11:31, Jan Kiszka <jan.kiszka@siemens.com> wrote:
>> Sorry for hijacking the thread, but it seems related: These bits address
>> AArch64, but what is the status of AArch32 /wrt hyp mode emulation?
>> After playing with the "fast" model, I would be glad to find such
>> support in QEMU rather sooner than later.
> 
> I don't think anybody is currently working on that,
> though it is an obvious gap to fill in at some point.
> 
> I would caution against testing hypervisors on QEMU
> rather than against hardware or the Fast Model,
> except for anything other than basic smoke tests,
> though -- there are a lot of complications and corner
> cases in the architecture here and I expect we will
> spend some time flushing out bugs as OSes expose
> them.

No difference with nested virt for KVM: I fixed several corner cases
along the way of getting Jailhouse running on x86. This time we already
have a working baseline, so shaking out bugs might be even easier. What
matters more mid- and long-term is the round-trip time, in fact.

Jan

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