Re: [Qemu-devel] [RFC PATCH 3/3] tcg/aarch64: Remove code buffer size limitation

[Richard Henderson]

On 06/07/2017 03:52 PM, Pranith Kumar wrote:
> This enables indirect jump on aarch64 hosts. Tested by booting an x86 guest on 
> aarch64 host.

This patch is doing too many things.

One patch should be the switch to indirect chaining (which should also squash 
in the 2/3 patch, otherwise tcg_out_insn_3305 is unused and therefore provokes 
a Werror).

Second, you should consider merely softening the code buffer size limitation to 
2GB.  At that point, we still use just ADRP+ADD to form the return address for 
exit_tb.

Third, if you want to go beyond 2GB to no limit at all, then we need to 
consider reserving a register to contain the return address back to the epilogue.


r~