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Re: [Qemu-ppc] [Qemu-devel] Bad icount read when running qemu-system-ppc

From: Richard Henderson
Subject: Re: [Qemu-ppc] [Qemu-devel] Bad icount read when running qemu-system-ppc64 and mfspr atbu guest instruction
Date: Thu, 12 Apr 2018 09:39:47 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 04/12/2018 04:18 AM, Darrell Leinwand wrote:
> Hi,
> When I enable icount using an e5500 core I get an exit with “Bad icount
> read” when the guest software executes a load atbu command.

Yep, it looks like there are some bugs in the ppc front end wrt icount.

In target/ppc/translate_init.c, spr_read_tbu has the proper wrappers for
integrating with icount, but a few lines lower spr_read_atbl and spr_read_atbu
do not.

This will probably have to wait until the 2.13 cycle to fix...



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