linux-kernel - Re: [PATCH v7 01/15] swiotlb: Refactor swiotlb init functions

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Message-ID: <bab261b4-f801-05af-8fd9-c440ed219591@amd.com>
Date:   Thu, 27 May 2021 09:41:02 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Christoph Hellwig <hch@....de>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     Claire Chang <tientzu@...omium.org>,
        Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        benh@...nel.crashing.org, paulus@...ba.org,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        sstabellini@...nel.org, Robin Murphy <robin.murphy@....com>,
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Subject: Re: [PATCH v7 01/15] swiotlb: Refactor swiotlb init functions

On 5/27/21 8:02 AM, Christoph Hellwig wrote:
> On Wed, May 19, 2021 at 11:50:07AM -0700, Florian Fainelli wrote:
>> You convert this call site with swiotlb_init_io_tlb_mem() which did not
>> do the set_memory_decrypted()+memset(). Is this okay or should
>> swiotlb_init_io_tlb_mem() add an additional argument to do this
>> conditionally?
> 
> The zeroing is useful and was missing before.  I think having a clean
> state here is the right thing.
> 
> Not sure about the set_memory_decrypted, swiotlb_update_mem_attributes
> kinda suggests it is too early to set the memory decrupted.
> 
> Adding Tom who should now about all this.

The reason for adding swiotlb_update_mem_attributes() was because having
the call to set_memory_decrypted() in swiotlb_init_with_tbl() triggered a
BUG_ON() related to interrupts not being enabled yet during boot. So that
call had to be delayed until interrupts were enabled.

Thanks,
Tom

>