From: Greg Kurz <groug@kaod.org>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: David Gibson <david@gibson.dropbear.id.au>,
qemu-ppc@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 3/3] target/ppc: filter out non-zero PCR values when using TCG
Date: Fri, 15 Jun 2018 00:00:20 +0200 [thread overview]
Message-ID: <20180615000020.2a3372a5@bahia.lan> (raw)
In-Reply-To: <ea3044c2-d8cd-d41d-91a6-5d78bff86e76@linaro.org>
On Thu, 14 Jun 2018 09:52:55 -1000
Richard Henderson <richard.henderson@linaro.org> wrote:
> On 06/12/2018 10:19 PM, Greg Kurz wrote:
> > I'm confused... I don't see anything related to HTM in TCG. Also we have
> > the following in cap_htm_apply():
> >
> > if (tcg_enabled()) {
> > error_setg(errp,
> > "No Transactional Memory support in TCG, try cap-htm=off");
> >
> > I'm probably missing something... can you enlighten me ?
>
> One of the two IBM machines -- and I thought it was ppc not s390x, but the code
> you quote seems to deny that memory -- has stub support for TM within TCG.
>
Oh ? I didn't know and didn't check :)
> To wit, the instructions are recognized and transactions always fail. Which is
> not a bad way to test the required fallback paths that rarely fail on hardware.
> ;-)
If TM instructions don't cause an exception, I guess its reasonable to say
they're supported :)
--
G
>
>
> r~
next prev parent reply other threads:[~2018-06-14 22:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-12 16:27 [Qemu-devel] [PATCH 1/3] target/ppc: drop empty #if/#endif block Greg Kurz
2018-06-12 16:43 ` Philippe Mathieu-Daudé
2018-06-12 17:01 ` [Qemu-devel] [PATCH 2/3] spapr: fix leak in h_client_architecture_support() Greg Kurz
2018-06-12 20:13 ` Philippe Mathieu-Daudé
2018-06-12 23:38 ` David Gibson
2018-06-12 17:04 ` [Qemu-devel] [PATCH 3/3] target/ppc: filter out non-zero PCR values when using TCG Greg Kurz
2018-06-13 0:45 ` David Gibson
2018-06-13 8:19 ` Greg Kurz
2018-06-13 12:05 ` David Gibson
2018-06-13 14:26 ` Greg Kurz
2018-06-14 1:26 ` David Gibson
2018-06-14 19:52 ` Richard Henderson
2018-06-14 22:00 ` Greg Kurz [this message]
2018-06-15 1:45 ` David Gibson
2018-06-15 3:38 ` Richard Henderson
2018-06-15 3:40 ` David Gibson
2018-06-15 8:11 ` [Qemu-devel] [Qemu-ppc] " Greg Kurz
2018-06-12 23:38 ` [Qemu-devel] [PATCH 1/3] target/ppc: drop empty #if/#endif block David Gibson
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