linux-kernel - Re: A problem of Intel IOMMU hardware ？

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Message-ID: <87a5f90a-d1ea-fe7a-2577-fdfdf25f8fd7@linux.intel.com>
Date:   Thu, 18 Mar 2021 10:58:30 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     baolu.lu@...ux.intel.com,
        "Longpeng (Mike, Cloud Infrastructure Service Product Dept.)" 
        <longpeng2@...wei.com>, dwmw2@...radead.org, joro@...tes.org,
        will@...nel.org, iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        "Gonglei (Arei)" <arei.gonglei@...wei.com>, chenjiashang@...wei.com
Subject: Re: A problem of Intel IOMMU hardware ？

Hi Alex,

On 3/17/21 11:18 PM, Alex Williamson wrote:
>>>           {MAP,   0x0, 0xc0000000}, --------------------------------- (b)
>>>                   use GDB to pause at here, and then DMA read IOVA=0,
>> IOVA 0 seems to be a special one. Have you verified with other addresses
>> than IOVA 0?
> It is???  That would be a problem.
> 

No problem from hardware point of view as far as I can see. Just
thought about software might handle it specially.

Best regards,
baolu