From: Josh Poimboeuf <jpoimboe@kernel.org>
To: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Peter Zijlstra <peterz@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sean Christopherson <seanjc@google.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Nikolay Borisov <nik.borisov@suse.com>,
KP Singh <kpsingh@kernel.org>, Waiman Long <longman@redhat.com>,
Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2 1/3] x86/bugs: Only harden syscalls when needed
Date: Fri, 12 Apr 2024 15:58:25 -0700 [thread overview]
Message-ID: <20240412225825.3tgtu4opi2e5jucg@treble> (raw)
In-Reply-To: <20240412224232.uiaht6yx2ghtx3gg@desk>
On Fri, Apr 12, 2024 at 03:42:32PM -0700, Pawan Gupta wrote:
> On Fri, Apr 12, 2024 at 11:10:32AM -0700, Josh Poimboeuf wrote:
> > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> > index 3c7434329661..7c87fe80c696 100644
> > --- a/arch/x86/include/asm/cpufeatures.h
> > +++ b/arch/x86/include/asm/cpufeatures.h
> > @@ -470,6 +470,7 @@
> > #define X86_FEATURE_BHI_CTRL (21*32+ 2) /* "" BHI_DIS_S HW control available */
> > #define X86_FEATURE_CLEAR_BHB_HW (21*32+ 3) /* "" BHI_DIS_S HW control enabled */
> > #define X86_FEATURE_CLEAR_BHB_LOOP_ON_VMEXIT (21*32+ 4) /* "" Clear branch history at vmexit using SW loop */
> > +#define X86_FEATURE_INDIRECT_SAFE (21*32+ 4) /* "" Indirect branches aren't vulnerable to Spectre v2 */
>
> This should be (21*32+ 5).
Argh :-/
> Other than that:
>
> Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Thanks!
--
Josh
next prev parent reply other threads:[~2024-04-12 22:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 18:10 [PATCH 0/3] x86/bugs: BHI fixes / improvements - round 2 Josh Poimboeuf
2024-04-12 18:10 ` [PATCH v2 1/3] x86/bugs: Only harden syscalls when needed Josh Poimboeuf
2024-04-12 22:42 ` Pawan Gupta
2024-04-12 22:58 ` Josh Poimboeuf [this message]
2024-04-15 7:32 ` Nikolay Borisov
2024-04-15 15:16 ` Linus Torvalds
2024-04-15 15:27 ` Nikolay Borisov
2024-04-15 15:47 ` Linus Torvalds
2024-04-12 18:10 ` [PATCH 2/3] x86/bugs: Fix BHI retpoline check Josh Poimboeuf
2024-04-12 23:18 ` Pawan Gupta
2024-04-14 9:19 ` [tip: x86/urgent] " tip-bot2 for Josh Poimboeuf
2024-04-12 18:10 ` [PATCH 3/3] x86/bugs: Remove support for Spectre v2 LFENCE "retpolines" Josh Poimboeuf
2024-04-12 18:20 ` Josh Poimboeuf
2024-04-12 20:49 ` Andrew Cooper
2024-04-15 23:44 ` Josh Poimboeuf
2024-04-13 4:21 ` Josh Poimboeuf
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