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[Qemu-devel] tcg: How CPUState::current_tb is used?

From: Sergey Fedorov
Subject: [Qemu-devel] tcg: How CPUState::current_tb is used?
Date: Mon, 2 May 2016 22:54:48 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2


I can't figure out how this field is used. The comment says it's "Currently executing TB", but actually it's the first TB in a chain of TBs executed. Grep shows the only place it is really checked is tb_invalidate_phys_page_range(). That code seems to be introduced long ago in:

commit ea1c18022edd0e2c45552d6fc2da6e15a3486b33
Author: bellard <address@hidden>
Date:   Mon Jun 14 18:56:36 2004 +0000

    fixed self modifying code in case of asynchronous interrupt

I suspect it's only related to user emulation. But I would appreciate if someone could give me an idea of how this really works :)


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