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Re: [Qemu-devel] [PATCH 1/8] tcg: Clean up direct block chaining data fi

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 1/8] tcg: Clean up direct block chaining data fields
Date: Mon, 28 Mar 2016 15:12:30 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 03/24/2016 08:11 AM, Paolo Bonzini wrote:
There is also a case where a TB jumps to itself; it then appears twice
in the list with different values in the low bits, such as this:

     tb->jmp_list_first = tb | 0;
      .--------------------'   |
      |                .-------'
     tb->jmp_list_next[0] = tb | 2;

Of course, it begs the question of why TB would be in its own list, even if it does jump to itself. We only need the points-to list in order to invalidate a TB and unlink it. But if TB is being invalidated, we don't need to reset the jump within TB itself.


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