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From: Peter Maydell <peter.maydell@linaro.org>
Date: Sun, 29 Jul 2018 12:28:20 +0100
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Subject: Re: [Qemu-devel] [PATCH v1 1/1] configure: Add RISC-V host support
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To: Richard Henderson <richard.henderson@linaro.org>
Cc: Alistair Francis <alistair.francis@wdc.com>, QEMU Developers <qemu-devel@nongnu.org>, Michael Clark <mjc@sifive.com>, Alistair Francis <alistair23@gmail.com>

On 28 July 2018 at 17:36, Richard Henderson
<richard.henderson@linaro.org> wrote:
> On 07/27/2018 04:49 PM, Alistair Francis wrote:
>> Allow QEMU to be built to run on a RISC-V host.
>>
>> QEMU does not yet have a RISC-V TCG or user mode target port, but
>> running other architectures on RISC-V using TCI does work.
>>
>> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
>> ---
>>  configure | 18 +++++++++++++++++-
>>  1 file changed, 17 insertions(+), 1 deletion(-)
>
> This is ok as far as it goes.
>
> Even for TCI, you need some more.
>
> At minimum, see Michael Clark's branch changes to accel/tcg/user-exec.c for
> host signal handling.  While you can run *-softmmu without this, none of
> *-linux-user will work reliably.
>
> Another piece that even Michael Clark does not have is
> linux-user/host/*/safe-syscall.S.

It might be nice to complete the safe-syscall stuff for all hosts,
and then remove the fallback that lets you build an unreliable
linux-user binary without it...

thanks
-- PMM