From: Sean Christopherson <seanjc@google.com>
To: Will Deacon <will@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Jonathan Corbet <corbet@lwn.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Peter Zijlstra <peterz@infradead.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>,
linuxppc-dev@lists.ozlabs.org, linux-arch@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH 1/3] x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n
Date: Fri, 19 Apr 2024 07:06:00 -0700 [thread overview]
Message-ID: <ZiJ6SDcbTBQjrG3r@google.com> (raw)
In-Reply-To: <20240419140321.GF3148@willie-the-truck>
On Fri, Apr 19, 2024, Will Deacon wrote:
> On Mon, Apr 15, 2024 at 07:31:23AM -0700, Sean Christopherson wrote:
> > On Mon, Apr 15, 2024, Geert Uytterhoeven wrote:
> > Oof. I completely missed that "cpu_mitigations" wasn't x86-only. I can't think
> > of better solution than an on-by-default generic Kconfig, though can't that it
> > more simply be:
> >
> > diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
> > index 2b8fd6bb7da0..5930cb56ee29 100644
> > --- a/drivers/base/Kconfig
> > +++ b/drivers/base/Kconfig
> > @@ -191,6 +191,9 @@ config GENERIC_CPU_AUTOPROBE
> > config GENERIC_CPU_VULNERABILITIES
> > bool
> >
> > +config SPECULATION_MITIGATIONS
> > + def_bool !X86
> > +
> > config SOC_BUS
> > bool
> > select GLOB
>
> I can't see this in -next yet. Do you plan to post it as a proper patch
> to collect acks etc?
Sorry, I neglected to Cc everyone.
https://lore.kernel.org/all/20240417001507.2264512-2-seanjc@google.com
WARNING: multiple messages have this Message-ID (diff)
From: Sean Christopherson <seanjc@google.com>
To: Will Deacon <will@kernel.org>
Cc: linux-arch@vger.kernel.org,
Stephen Rothwell <sfr@canb.auug.org.au>,
x86@kernel.org, Jonathan Corbet <corbet@lwn.net>,
Peter Zijlstra <peterz@infradead.org>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
Heiko Carstens <hca@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
linuxppc-dev@lists.ozlabs.org,
Josh Poimboeuf <jpoimboe@kernel.org>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>
Subject: Re: [PATCH 1/3] x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n
Date: Fri, 19 Apr 2024 07:06:00 -0700 [thread overview]
Message-ID: <ZiJ6SDcbTBQjrG3r@google.com> (raw)
In-Reply-To: <20240419140321.GF3148@willie-the-truck>
On Fri, Apr 19, 2024, Will Deacon wrote:
> On Mon, Apr 15, 2024 at 07:31:23AM -0700, Sean Christopherson wrote:
> > On Mon, Apr 15, 2024, Geert Uytterhoeven wrote:
> > Oof. I completely missed that "cpu_mitigations" wasn't x86-only. I can't think
> > of better solution than an on-by-default generic Kconfig, though can't that it
> > more simply be:
> >
> > diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
> > index 2b8fd6bb7da0..5930cb56ee29 100644
> > --- a/drivers/base/Kconfig
> > +++ b/drivers/base/Kconfig
> > @@ -191,6 +191,9 @@ config GENERIC_CPU_AUTOPROBE
> > config GENERIC_CPU_VULNERABILITIES
> > bool
> >
> > +config SPECULATION_MITIGATIONS
> > + def_bool !X86
> > +
> > config SOC_BUS
> > bool
> > select GLOB
>
> I can't see this in -next yet. Do you plan to post it as a proper patch
> to collect acks etc?
Sorry, I neglected to Cc everyone.
https://lore.kernel.org/all/20240417001507.2264512-2-seanjc@google.com
next prev parent reply other threads:[~2024-04-19 14:06 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-09 17:51 [PATCH 0/3] x86/cpu: Fix SPECULATIVE_MITIGATION=n kernels Sean Christopherson
2024-04-09 17:51 ` [PATCH 1/3] x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n Sean Christopherson
2024-04-10 14:31 ` [tip: x86/urgent] " tip-bot2 for Sean Christopherson
2024-04-13 1:53 ` [PATCH 1/3] " Stephen Rothwell
2024-04-13 1:53 ` Stephen Rothwell
2024-04-13 9:27 ` Michael Ellerman
2024-04-13 9:27 ` Michael Ellerman
2024-04-13 9:38 ` Michael Ellerman
2024-04-13 9:38 ` Michael Ellerman
2024-04-14 22:42 ` Stephen Rothwell
2024-04-14 22:42 ` Stephen Rothwell
2024-04-15 11:16 ` Geert Uytterhoeven
2024-04-15 11:16 ` Geert Uytterhoeven
2024-04-15 14:31 ` Sean Christopherson
2024-04-15 14:31 ` Sean Christopherson
2024-04-16 11:06 ` Michael Ellerman
2024-04-16 11:06 ` Michael Ellerman
2024-04-19 14:03 ` Will Deacon
2024-04-19 14:03 ` Will Deacon
2024-04-19 14:06 ` Sean Christopherson [this message]
2024-04-19 14:06 ` Sean Christopherson
2024-04-19 14:38 ` Will Deacon
2024-04-19 14:38 ` Will Deacon
2024-04-15 11:13 ` Geert Uytterhoeven
2024-04-15 11:13 ` Geert Uytterhoeven
2024-04-09 17:51 ` [PATCH 2/3] x86/cpu: Disable BHI mitigation by default when SPECULATION_MITIGATIONS=n Sean Christopherson
2024-04-10 14:31 ` [tip: x86/urgent] " tip-bot2 for Sean Christopherson
2024-04-09 17:51 ` [PATCH 3/3] x86/cpu: Ignore "mitigations" kernel parameter if SPECULATION_MITIGATIONS=n Sean Christopherson
2024-04-10 14:18 ` Ingo Molnar
2024-04-09 18:55 ` [PATCH 0/3] x86/cpu: Fix SPECULATIVE_MITIGATION=n kernels Daniel Sneddon
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