From: "Lendacky, Thomas" <Thomas.Lendacky@amd.com>
To: Borislav Petkov <bp@alien8.de>, Thomas Gleixner <tglx@linutronix.de>
Cc: "x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Jiri Kosina <jkosina@suse.cz>, Ingo Molnar <mingo@redhat.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
David Woodhouse <dwmw@amazon.co.uk>
Subject: Re: [PATCH v2] x86/speculation: Add support for STIBP always-on preferred mode
Date: Wed, 12 Dec 2018 14:04:35 +0000 [thread overview]
Message-ID: <be031a74-44d0-1fea-893a-bfdf3ba1655f@amd.com> (raw)
In-Reply-To: <20181212095938.GA6653@zn.tnic>
On 12/12/2018 03:59 AM, Borislav Petkov wrote:
> On Tue, Dec 11, 2018 at 07:37:26PM -0800, Thomas Gleixner wrote:
>> Hmmm. I've not seen the V1 of this (it's not in my inbox) but the v1->v2
>> changes contain:
>
> You're on CC:
>
> https://lkml.kernel.org/r/20181211190959.28321.56433.stgit@tlendack-t1.amdoffice.net
>
>>
>>>> - Removed explicit SPECTRE_V2_USER_STRICT_PREFERRED mode
>>
>> Now I really have to ask why?
>>
>> Neither the extra variable nor the cpu feature check are pretty. An
>> explicit mode is way better in terms of code clarity and you get the proper
>> printout via spectre_v2_user_strings.
>
> Actually, now that I've slept on it, I think we should do this just
> like X86_FEATURE_IBRS_ENHANCED - as a modifier for SPECTRE_V2_CMD_AUTO
> or _FORCE options.
>
> And that has its own mode SPECTRE_V2_IBRS_ENHANCED.
>
> Makes sense?
Not sure I completely follow. Are you saying to do what I did in my
first patch or something different from that yet?
Thanks,
Tom
>
next prev parent reply other threads:[~2018-12-12 14:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-11 22:46 [PATCH v2] x86/speculation: Add support for STIBP always-on preferred mode Lendacky, Thomas
2018-12-12 0:05 ` Borislav Petkov
2018-12-12 3:37 ` Thomas Gleixner
2018-12-12 9:59 ` Borislav Petkov
2018-12-12 14:04 ` Lendacky, Thomas [this message]
2018-12-12 14:32 ` Boris Petkov
2018-12-12 15:01 ` Lendacky, Thomas
2018-12-12 14:03 ` Lendacky, Thomas
2018-12-12 14:23 ` Thomas Gleixner
2018-12-12 15:04 ` Lendacky, Thomas
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