From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>,
QEMU Developers <qemu-devel@nongnu.org>
Cc: Pavel Dovgaluk <Pavel.Dovgaluk@ispras.ru>,
Richard Henderson <rth@twiddle.net>
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 [thread overview]
Message-ID: <555243C8.30602@redhat.com> (raw)
In-Reply-To: <CAFEAcA9JC4qUiHBbdXSpRZZtfPc7+Vu9vzd_3b87Zf-v9psfAQ@mail.gmail.com>
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().
Paolo
next prev parent reply other threads:[~2015-05-12 18:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-12 15:32 [Qemu-devel] when does a target frontend need to use gen_io_start()/gen_io_end() ? Peter Maydell
2015-05-12 15:43 ` Richard Henderson
2015-05-12 15:54 ` Peter Maydell
2015-05-12 18:17 ` Paolo Bonzini [this message]
2015-05-12 19:41 ` Peter Maydell
2015-05-13 8:42 ` Paolo Bonzini
2015-05-13 9:41 ` Peter Maydell
2015-05-13 10:03 ` Paolo Bonzini
2015-05-13 12:30 ` Frederic Konrad
2015-05-13 6:57 ` Pavel Dovgaluk
[not found] ` <16201.3286528692$1431500273@news.gmane.org>
2015-05-13 8:32 ` Paolo Bonzini
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