From: Russell King - ARM Linux <linux@armlinux.org.uk> To: Florian Fainelli <f.fainelli@gmail.com> Cc: Marc Zyngier <marc.zyngier@arm.com>, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Subject: Re: [PATCH 06/14] ARM: spectre-v2: harden branch predictor on context switches Date: Tue, 22 May 2018 10:55:06 +0100 [thread overview] Message-ID: <20180522095506.GQ17671@n2100.armlinux.org.uk> (raw) In-Reply-To: <61e24c59-9905-8524-92ba-98cdbadb3011@gmail.com> On Mon, May 21, 2018 at 08:21:58PM -0700, Florian Fainelli wrote: > > > On 05/21/2018 04:44 AM, Russell King wrote: > > Harden the branch predictor against Spectre v2 attacks on context > > switches for ARMv7 and later CPUs. We do this by: > > > > Cortex A9, A12, A17, A73, A75: invalidating the BTB. > > Cortex A15, Brahma B15: invalidating the instruction cache. > > > > Cortex A57 and Cortex A72 are not addressed in this patch. > > > > Cortex R7 and Cortex R8 are also not addressed as we do not enforce > > memory protection on these cores. > > > > Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> > > Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> It does need this additional patch to avoid some build errors - I'm surprised that my autobuilder found it before the 0-day builder... diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c index 0c37e6a2830d..526d07ab6b7a 100644 --- a/arch/arm/mm/proc-v7-bugs.c +++ b/arch/arm/mm/proc-v7-bugs.c @@ -127,4 +127,8 @@ void cpu_v7_bugs_init(void) pr_info("CPU: Spectre v2: using %s workaround\n", spectre_v2_method); } +#else +void cpu_v7_bugs_init(void) +{ +} #endif -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps up According to speedtest.net: 8.21Mbps down 510kbps up
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From: linux@armlinux.org.uk (Russell King - ARM Linux) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 06/14] ARM: spectre-v2: harden branch predictor on context switches Date: Tue, 22 May 2018 10:55:06 +0100 [thread overview] Message-ID: <20180522095506.GQ17671@n2100.armlinux.org.uk> (raw) In-Reply-To: <61e24c59-9905-8524-92ba-98cdbadb3011@gmail.com> On Mon, May 21, 2018 at 08:21:58PM -0700, Florian Fainelli wrote: > > > On 05/21/2018 04:44 AM, Russell King wrote: > > Harden the branch predictor against Spectre v2 attacks on context > > switches for ARMv7 and later CPUs. We do this by: > > > > Cortex A9, A12, A17, A73, A75: invalidating the BTB. > > Cortex A15, Brahma B15: invalidating the instruction cache. > > > > Cortex A57 and Cortex A72 are not addressed in this patch. > > > > Cortex R7 and Cortex R8 are also not addressed as we do not enforce > > memory protection on these cores. > > > > Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> > > Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> It does need this additional patch to avoid some build errors - I'm surprised that my autobuilder found it before the 0-day builder... diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c index 0c37e6a2830d..526d07ab6b7a 100644 --- a/arch/arm/mm/proc-v7-bugs.c +++ b/arch/arm/mm/proc-v7-bugs.c @@ -127,4 +127,8 @@ void cpu_v7_bugs_init(void) pr_info("CPU: Spectre v2: using %s workaround\n", spectre_v2_method); } +#else +void cpu_v7_bugs_init(void) +{ +} #endif -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps up According to speedtest.net: 8.21Mbps down 510kbps up
next prev parent reply other threads:[~2018-05-22 9:45 UTC|newest] Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-05-21 11:42 [PATCH v2 00/14] ARM Spectre variant 2 fixes Russell King - ARM Linux 2018-05-21 11:42 ` Russell King - ARM Linux 2018-05-21 11:44 ` [PATCH 01/14] ARM: add CPU part numbers for Cortex A73, A75 and Brahma B15 Russell King 2018-05-21 11:44 ` Russell King 2018-05-21 11:44 ` [PATCH 02/14] ARM: bugs: prepare processor bug infrastructure Russell King 2018-05-21 11:44 ` Russell King 2018-05-21 11:44 ` [PATCH 03/14] ARM: bugs: hook processor bug checking into SMP and suspend paths Russell King 2018-05-21 11:44 ` Russell King 2018-05-24 23:30 ` Florian Fainelli 2018-05-24 23:30 ` Florian Fainelli 2018-05-25 10:03 ` Russell King - ARM Linux 2018-05-25 10:03 ` Russell King - ARM Linux 2018-05-25 11:31 ` Russell King - ARM Linux 2018-05-25 11:31 ` Russell King - ARM Linux 2018-05-21 11:44 ` [PATCH 04/14] ARM: bugs: add support for per-processor bug checking Russell King 2018-05-21 11:44 ` Russell King 2018-05-21 11:44 ` [PATCH 05/14] ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre Russell King 2018-05-21 11:44 ` Russell King 2018-05-21 11:44 ` [PATCH 06/14] ARM: spectre-v2: harden branch predictor on context switches Russell King 2018-05-21 11:44 ` Russell King 2018-05-22 3:21 ` Florian Fainelli 2018-05-22 3:21 ` Florian Fainelli 2018-05-22 9:55 ` Russell King - ARM Linux [this message] 2018-05-22 9:55 ` Russell King - ARM Linux 2018-05-22 18:27 ` Tony Lindgren 2018-05-22 18:27 ` Tony Lindgren 2018-05-21 11:44 ` [PATCH 07/14] ARM: spectre-v2: add Cortex A8 and A15 validation of the IBE bit Russell King 2018-05-21 11:44 ` Russell King 2018-05-22 18:28 ` Tony Lindgren 2018-05-22 18:28 ` Tony Lindgren 2018-05-21 11:45 ` [PATCH 08/14] ARM: spectre-v2: harden user aborts in kernel space Russell King 2018-05-21 11:45 ` Russell King 2018-05-22 17:15 ` Marc Zyngier 2018-05-22 17:15 ` Marc Zyngier 2018-05-22 17:56 ` Russell King - ARM Linux 2018-05-22 17:56 ` Russell King - ARM Linux 2018-05-22 18:12 ` Russell King - ARM Linux 2018-05-22 18:12 ` Russell King - ARM Linux 2018-05-22 18:19 ` Florian Fainelli 2018-05-22 18:19 ` Florian Fainelli 2018-05-22 23:25 ` Russell King - ARM Linux 2018-05-22 23:25 ` Russell King - ARM Linux 2018-05-21 11:45 ` [PATCH 09/14] ARM: spectre-v2: add PSCI based hardening Russell King 2018-05-21 11:45 ` Russell King 2018-05-22 17:24 ` Marc Zyngier 2018-05-22 17:24 ` Marc Zyngier 2018-05-22 17:57 ` Russell King - ARM Linux 2018-05-22 17:57 ` Russell King - ARM Linux 2018-05-23 7:25 ` Marc Zyngier 2018-05-23 7:25 ` Marc Zyngier 2018-05-23 19:45 ` Russell King - ARM Linux 2018-05-23 19:45 ` Russell King - ARM Linux 2018-05-24 12:03 ` Marc Zyngier 2018-05-24 12:03 ` Marc Zyngier 2018-05-24 12:30 ` Russell King - ARM Linux 2018-05-24 12:30 ` Russell King - ARM Linux 2018-05-24 12:49 ` Marc Zyngier 2018-05-24 12:49 ` Marc Zyngier 2018-05-24 13:04 ` Russell King - ARM Linux 2018-05-24 13:04 ` Russell King - ARM Linux 2018-05-21 11:45 ` [PATCH 10/14] ARM: KVM: invalidate BTB on guest exit for Cortex-A12/A17 Russell King 2018-05-21 11:45 ` Russell King 2018-05-21 11:45 ` [PATCH 11/14] ARM: KVM: invalidate icache on guest exit for Cortex-A15 Russell King 2018-05-21 11:45 ` Russell King 2018-05-21 11:45 ` [PATCH 12/14] ARM: spectre-v2: KVM: invalidate icache on guest exit for Brahma B15 Russell King 2018-05-21 11:45 ` Russell King 2018-05-22 3:22 ` Florian Fainelli 2018-05-22 3:22 ` Florian Fainelli 2018-05-21 11:45 ` [PATCH 13/14] ARM: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling Russell King 2018-05-21 11:45 ` Russell King 2018-05-23 10:50 ` Marc Zyngier 2018-05-23 10:50 ` Marc Zyngier 2018-05-21 11:45 ` [PATCH 14/14] ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1 Russell King 2018-05-21 11:45 ` Russell King 2018-05-24 23:18 ` [PATCH v2 00/14] ARM Spectre variant 2 fixes Florian Fainelli 2018-05-24 23:18 ` Florian Fainelli 2018-05-25 10:00 ` Russell King - ARM Linux 2018-05-25 10:00 ` Russell King - ARM Linux -- strict thread matches above, loose matches on Subject: below -- 2018-05-16 10:59 [PATCH 0/14] " Russell King - ARM Linux 2018-05-16 11:01 ` [PATCH 06/14] ARM: spectre-v2: harden branch predictor on context switches Russell King 2018-05-16 11:01 ` Russell King 2018-05-16 11:33 ` Vladimir Murzin 2018-05-16 11:33 ` Vladimir Murzin
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