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Re: [Qemu-devel] [PATCH for-4.0 0/5] tcg/i386: Improve guest_base handli

From: Emilio G. Cota
Subject: Re: [Qemu-devel] [PATCH for-4.0 0/5] tcg/i386: Improve guest_base handling
Date: Mon, 10 Dec 2018 16:53:19 -0500
User-agent: Mutt/1.9.4 (2018-02-28)

On Mon, Dec 03, 2018 at 10:08:35 -0600, Richard Henderson wrote:
> This tidies guest_base handling such that (1) we require no scratch
> registers, (2) we require no extra instructions besides the memory op,
> and (3) we reduce the size of the memory op by omitting a prefix.
> In principal point 3 is offset by adding additional opcodes to handle
> zero-extension when converting 64-bit guest values back to 32-bit guest
> addresses.  But those turn out to be hen's teeth, since 32-bit guests
> often have no way of even producing 64-bit guest values.
> In particular, I saw none in a simple pass through linux-user-test-0.3
> for i386, arm, sh4, sparc.

Reviewed-by: Emilio G. Cota <address@hidden>

for the series.



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