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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: Wed, 13 May 2015 10:32:36 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 13/05/2015 08:57, Pavel Dovgaluk wrote:
>> > It's any instruction that can cause an icount read, typically through
>> > QEMU_CLOCK_VIRTUAL or cpu_get_ticks().
> Doesn't this mean that ARM has incorrect implementation of icount?
> MMIO is common for this platform, but none of memory accesses are
> surrounded with gen_io_start()/gen_io_end().

See here:

    if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu_can_do_io(cpu)) {
        cpu_io_recompile(cpu, retaddr);

in softmmu_template.h.


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