linux-kernel - Re: [PATCH v6 2/3] iommu/pci: reserve IOVA for PCI masters

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]

Date:   Fri, 19 May 2017 06:51:28 +0530
From:   Oza Oza <oza.oza@...adcom.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Oza Pawandeep <oza.pawandeep@...il.com>
Subject: Re: [PATCH v6 2/3] iommu/pci: reserve IOVA for PCI masters

On Wed, May 17, 2017 at 10:41 PM, Bjorn Helgaas <helgaas@...nel.org> wrote:
> On Tue, May 16, 2017 at 10:52:06AM +0530, Oza Pawandeep wrote:
>> this patch reserves the IOVA for PCI masters.
>> ARM64 based SOCs may have scattered memory banks.
>> such as iproc based SOC has
>>
>> <0x00000000 0x80000000 0x0 0x80000000>, /* 2G @ 2G */
>> <0x00000008 0x80000000 0x3 0x80000000>, /* 14G @ 34G */
>> <0x00000090 0x00000000 0x4 0x00000000>, /* 16G @ 576G */
>> <0x000000a0 0x00000000 0x4 0x00000000>; /* 16G @ 640G */
>>
>> but incoming PCI transcation addressing capability is limited
>
> s/transcation/transaction/
>
>> by host bridge, for example if max incoming window capability
>> is 512 GB, then 0x00000090 and 0x000000a0 will fall beyond it.
>>
>> to address this problem, iommu has to avoid allocating IOVA which
>
> s/iommu/IOMMU/
>
>> are reserved. which inturn does not allocate IOVA if it falls into hole.
>
> s/inturn/in turn/

Hi Bjorn,

Thank you for the comments.
Will take care of all your comments.

Regards,
Oza.