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Re: [Qemu-devel] Question regarding self-modifying code.

From: Peter Maydell
Subject: Re: [Qemu-devel] Question regarding self-modifying code.
Date: Thu, 14 Jan 2016 10:27:52 +0000

On 14 January 2016 at 10:15, farmdve <address@hidden> wrote:
> Sorry about that. Somehow Google decided it should reply to you, rather than
> the mailing list. It was an honest mistake.
> Original question is below
> I am unable to get this part here if (!(tb_end <= start || tb_start >= end))
> in tb_invalidate_phys_page_range
> What would happen if code forward modifies itself, but that condition
> evaluates to true?

If that condition is true, then the TB we're looking at (as we
iterate through every TB we know about) is not in fact overlapping
with the page that the guest just modified, and so is not affected
by the write...

> Then this piece here won't get executed

...and so it is correct that we don't need to do anything for this TB.

-- PMM

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