From: Arjan van de Ven <arjan@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
Rik van Riel <riel@redhat.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Peter Zijlstra <peterz@infradead.org>,
Jiri Kosina <jikos@kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Kees Cook <keescook@google.com>,
Greg Kroah-Hartman <gregkh@linux-foundation.org>,
Paul Turner <pjt@google.com>, David Woodhouse <dwmw@amazon.co.uk>,
the arch/x86 maintainers <x86@kernel.org>,
Andi Kleen <ak@linux.intel.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
"Mallick, Asit K" <asit.k.mallick@intel.com>
Subject: Re: [RFC][PATCH] x86: proposed new ARCH_CAPABILITIES MSR bit for RSB-underflow
Date: Fri, 16 Feb 2018 11:47:27 -0800 [thread overview]
Message-ID: <768f3a56-28b0-91a1-f555-94e64a146abc@linux.intel.com> (raw)
In-Reply-To: <CA+55aFyg-uS_hE6f2t5gOrwaCMXErPvGA7tjfhmXZmZOPzi8Ww@mail.gmail.com>
On 2/16/2018 11:43 AM, Linus Torvalds wrote:
> On Fri, Feb 16, 2018 at 11:38 AM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>>
>> Of course, your patch still doesn't allow for "we claim to be skylake
>> for various other independent reasons, but the RSB issue is fixed".
>
> .. maybe nobody ever has a reason to do that, though?
yeah I would be extremely surprised
>
> Who knows, virtualization people may simply want the user to specify
> the model, but then make the Spectre decisions be based on actual
> hardware capabilities (whether those are "current" or "some minimum
> base").
once you fake to be skylake when you're not, you do that for a reason; normallyt
that reason is that you COULD migrate to a skylake.
(and migration is not supposed to be visble to the guest OS)
and at that point you are a skylake for all intents and purposes.
(and the virtualization people also really hate it when the hardware
burst the bubble of this fakeing hardware to be not what it is)
next prev parent reply other threads:[~2018-02-16 19:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-16 19:17 Dave Hansen
2018-02-16 19:38 ` Linus Torvalds
2018-02-16 19:43 ` Linus Torvalds
2018-02-16 19:47 ` Arjan van de Ven [this message]
2018-02-19 14:21 ` Woodhouse, David
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=768f3a56-28b0-91a1-f555-94e64a146abc@linux.intel.com \
--to=arjan@linux.intel.com \
--cc=ak@linux.intel.com \
--cc=asit.k.mallick@intel.com \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=dwmw@amazon.co.uk \
--cc=gnomes@lxorguk.ukuu.org.uk \
--cc=gregkh@linux-foundation.org \
--cc=jikos@kernel.org \
--cc=jpoimboe@redhat.com \
--cc=keescook@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=riel@redhat.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=tim.c.chen@linux.intel.com \
--cc=torvalds@linux-foundation.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®