From: Richard Henderson <richard.henderson@linaro.org>
To: Gustavo Romero <gromero@linux.ibm.com>, qemu-ppc@nongnu.org
Cc: qemu-devel@nongnu.org, peter.maydell@linaro.org, clg@kaod.org,
david@gibson.dropbear.id.au
Subject: Re: [PATCH v2] target/ppc: Integrate icount to purr, vtb, and tbu40
Date: Wed, 12 Aug 2020 14:33:33 -0700 [thread overview]
Message-ID: <5944440c-73ac-8c21-9f02-fee91a3a2dfd@linaro.org> (raw)
In-Reply-To: <20200811153235.4527-1-gromero@linux.ibm.com>
On 8/11/20 8:32 AM, Gustavo Romero wrote:
> Currently if option '-icount auto' is passed to the QEMU TCG to enable
> counting instructions the VM crashes with the following error report when
> Linux runs on it:
>
> qemu-system-ppc64: Bad icount read
>
> This happens because read/write access to the SPRs PURR, VTB, and TBU40
> is not integrated to the icount framework.
>
> This commit fixes that issue by making the read/write access of these
> SPRs aware of icount framework, adding the proper gen_io_start() calls
> before calling the helpers to load/store these SPRs in TCG and ensuring
> that the associated TBs end immediately after, accordingly to what's in
> docs/devel/tcg-icount.rst.
>
> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com>
> ---
> target/ppc/translate_init.inc.c | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
r~
next prev parent reply other threads:[~2020-08-12 21:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-11 15:32 [PATCH v2] target/ppc: Integrate icount to purr, vtb, and tbu40 Gustavo Romero
2020-08-12 21:33 ` Richard Henderson [this message]
2020-08-13 0:03 ` David Gibson
2020-08-13 2:42 ` Gustavo Romero
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