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Re: [Qemu-devel] when does a target frontend need to use gen_io_start()/

From: Paolo Bonzini
Subject: Re: [Qemu-devel] when does a target frontend need to use gen_io_start()/gen_io_end() ?
Date: Tue, 12 May 2015 20:17:44 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 12/05/2015 17:32, Peter Maydell wrote:
> In order for -icount to work, it's important for the target
> translate.c code to correctly bracket any generated code which
> can "do I/O" with gen_io_start()/gen_io_end() calls. But
> does anybody know exactly what the criteria are here for this?
> It would be nice if we could document this in a comment in
> gen_icount.h -- I'm happy to write one up if somebody will just
> tell me what the right answer is :-)

It's any instruction that can cause an icount read, typically through
QEMU_CLOCK_VIRTUAL or cpu_get_ticks().


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