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From: Tony Lindgren <tony@atomide.com>
To: Nishanth Menon <nm@ti.com>
Cc: Russell King <linux@armlinux.org.uk>,
	linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH V2] ARM: DRA7/OMAP5: Enable ACTLR[0] (Enable invalidates of BTB) for secondary cores
Date: Wed, 11 Jul 2018 06:24:31 -0700	[thread overview]
Message-ID: <20180711132431.GK99251@atomide.com> (raw)
In-Reply-To: <20180710194725.20339-1-nm@ti.com>

* Nishanth Menon <nm@ti.com> [180710 12:50]:
> Call secure services to enable ACTLR[0] (Enable invalidates of BTB with
> ICIALLU) when branch hardening is enabled for kernel.
> 
> On GP devices OMAP5/DRA7, there is no possibility to update secure
> side since "secure world" is ROM and there are no override mechanisms
> possible. On HS devices, appropriate PPA should do the workarounds as
> well.
> 
> However, the configuration is only done for secondary core, since it is
> expected that firmware/bootloader will have enabled the required
> configuration for the primary boot core (note: bootloaders typically
> will NOT enable secondary processors, since it has no need to do so).

Thanks for updating this. Seems like we should merge this into v4.18-rc
cycle as without this the already merged fixes are incomplete.
So if no objections, I'm planning to apply this tomorrow.

Regards,

Tony

WARNING: multiple messages have this Message-ID (diff)
From: tony@atomide.com (Tony Lindgren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2] ARM: DRA7/OMAP5: Enable ACTLR[0] (Enable invalidates of BTB) for secondary cores
Date: Wed, 11 Jul 2018 06:24:31 -0700	[thread overview]
Message-ID: <20180711132431.GK99251@atomide.com> (raw)
In-Reply-To: <20180710194725.20339-1-nm@ti.com>

* Nishanth Menon <nm@ti.com> [180710 12:50]:
> Call secure services to enable ACTLR[0] (Enable invalidates of BTB with
> ICIALLU) when branch hardening is enabled for kernel.
> 
> On GP devices OMAP5/DRA7, there is no possibility to update secure
> side since "secure world" is ROM and there are no override mechanisms
> possible. On HS devices, appropriate PPA should do the workarounds as
> well.
> 
> However, the configuration is only done for secondary core, since it is
> expected that firmware/bootloader will have enabled the required
> configuration for the primary boot core (note: bootloaders typically
> will NOT enable secondary processors, since it has no need to do so).

Thanks for updating this. Seems like we should merge this into v4.18-rc
cycle as without this the already merged fixes are incomplete.
So if no objections, I'm planning to apply this tomorrow.

Regards,

Tony

  reply	other threads:[~2018-07-11 13:24 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-10 19:47 [PATCH V2] ARM: DRA7/OMAP5: Enable ACTLR[0] (Enable invalidates of BTB) for secondary cores Nishanth Menon
2018-07-10 19:47 ` Nishanth Menon
2018-07-10 19:47 ` Nishanth Menon
2018-07-11 13:24 ` Tony Lindgren [this message]
2018-07-11 13:24   ` Tony Lindgren

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