From: Andi Kleen <ak@linux.intel.com>
To: pjt@google.com, linux-kernel@vger.kernel.org,
tim.c.chen@linux.intel.com, riel@redhat.com, jikos@kernel.org,
jpoimboe@redhat.com, luto@amacapital.net,
torvalds@linux-foundation.org, tglx@linutronix.de,
dwmw@amazon.co.uk, hpa@zytor.com, peterz@infradead.org,
dave.hansen@intel.com, mingo@kernel.org, keescook@google.com,
gregkh@linux-foundation.org, arjan@linux.intel.com
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/pti] x86/retpoline: Fill RSB on context switch for affected CPUs
Date: Sun, 14 Jan 2018 16:05:54 -0800 [thread overview]
Message-ID: <20180115000554.GA7844@tassilo.jf.intel.com> (raw)
In-Reply-To: <tip-c995efd5a740d9cbafbf58bde4973e8b50b4d761@git.kernel.org>
> + if ((!boot_cpu_has(X86_FEATURE_PTI) &&
> + !boot_cpu_has(X86_FEATURE_SMEP)) || is_skylake_era()) {
> + setup_force_cpu_cap(X86_FEATURE_RSB_CTXSW);
> + pr_info("Filling RSB on context switch\n");
> + }
Missing an option to turn this off.
-Andi
next prev parent reply other threads:[~2018-01-15 0:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-12 17:49 [PATCH] x86/retpoline: Fill RSB on context switch for affected CPUs David Woodhouse
2018-01-12 18:02 ` Andi Kleen
2018-01-12 18:23 ` David Woodhouse
2018-01-12 18:05 ` Andrew Cooper
2018-01-12 18:56 ` David Woodhouse
2018-01-12 23:41 ` Josh Poimboeuf
2018-01-14 11:39 ` Thomas Gleixner
2018-01-14 17:04 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-15 14:35 ` David Laight
2018-01-15 14:39 ` David Woodhouse
2018-01-15 14:42 ` Arjan van de Ven
2018-01-15 20:03 ` Kees Cook
2018-01-14 23:37 ` tip-bot for David Woodhouse
2018-01-15 0:05 ` Andi Kleen [this message]
2018-01-15 0:09 ` Andi Kleen
2018-01-15 10:13 ` David Woodhouse
2018-03-09 13:12 ` Maciej S. Szmigiero
2018-03-09 15:14 ` Andi Kleen
2018-03-09 15:33 ` Maciej S. Szmigiero
2018-03-09 15:38 ` Woodhouse, David
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