linux-kernel - Re: [PATCH] iommu/ipmmu-vmsa: Drop LPAE Kconfig dependency

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1853633.usacnlzPRA@avalon>
Date:	Tue, 20 Oct 2015 13:28:17 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Magnus Damm <magnus.damm@...il.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	iommu@...ts.linux-foundation.org,
	SH-Linux <linux-sh@...r.kernel.org>, joro <joro@...tes.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Simon Horman <horms+renesas@...ge.net.au>
Subject: Re: [PATCH] iommu/ipmmu-vmsa: Drop LPAE Kconfig dependency

Hi Magnus,

On Tuesday 20 October 2015 17:54:59 Magnus Damm wrote:
> On Mon, Oct 19, 2015 at 3:42 PM, Laurent Pinchart wrote:
> > On Monday 19 October 2015 12:02:53 Magnus Damm wrote:
> >> From: Magnus Damm <damm+renesas@...nsource.se>
> >> 
> >> Neither the ARM page table code enabled by IOMMU_IO_PGTABLE_LPAE
> >> nor the IPMMU_VMSA driver actually depends on ARM_LPAE, so get
> >> rid of the dependency.
> >> 
> >> Tested with ipmmu-vmsa on r8a7794 ALT and a kernel config using:
> >>  # CONFIG_ARM_LPAE is not set
> > 
> > The driver only supports the 40-bits page table format for now, hence the
> > dependency on LPAE, but it indeed seems that the dependency is bogus. As
> > long as the 8 MSBs of the translated address are all 0 I assume the
> > output 40-bit address is usable on a 32-bit physical address system.
> > 
> > How have you tested the patch ?
> 
> Modetest with local IPMMUMX enablement on r8a7794 ALT.

Then,

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

-- 
Regards,

Laurent Pinchart

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/