linux-kernel - Re: linux-next: build failure after merge of the iommu tree

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Date:   Mon, 2 Sep 2019 14:26:40 +0000
From:   "Lendacky, Thomas" <Thomas.Lendacky@....com>
To:     Joerg Roedel <joro@...tes.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
CC:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the iommu tree

On 9/2/19 9:03 AM, Joerg Roedel wrote:
> Hi,
> 
> tl;dr: And IOMMU commit introduces a new user for sme_active() in
>         generic code, and commit
> 
>         	284e21fab2cf x86, s390/mm: Move sme_active() and sme_me_mask to x86-specific header
> 
>         breaks the build of drivers/iommu/ for all architectures not
>         implementing sme_active().
> 
> On Mon, Sep 02, 2019 at 04:39:51PM +1000, Stephen Rothwell wrote:
>> drivers/iommu/iommu.c: In function 'iommu_subsys_init':
>> drivers/iommu/iommu.c:123:38: error: implicit declaration of function 'sme_active'; did you mean 'cpu_active'? [-Werror=implicit-function-declaration]
>>    123 |   if (iommu_default_passthrough() && sme_active()) {

Maybe we should make this mem_encrypt_active(), since this will probably
be needed if/when an IOMMU device is eventually added to a guest, and the
referenced commit below doesn't remove that call.

Thanks,
Tom

>>        |                                      ^~~~~~~~~~
>>        |                                      cpu_active
>>
>> Caused by commit
>>
>>    2cc13bb4f59f ("iommu: Disable passthrough mode when SME is active")
> 
> 
> Actually it is caused by:
> 
> 	commit 284e21fab2cfcf90dacce565e0b12f29e5df00c1
> 	Author: Thiago Jung Bauermann <bauerman@...ux.ibm.com>
> 	Date:   Tue Aug 6 01:49:17 2019 -0300
> 
> 	    x86, s390/mm: Move sme_active() and sme_me_mask to x86-specific header
> 
> which removes the sme_active prototype from the generic headers. The
> iommu commit is in next already for a couple of days and didn't cause
> problems before.
> 
>> sme_active() seems to be only relevant to X86.
> 
> It has an implementation on x86 and s390.
> 
>> I have reverted that commit for today.
> 
> Thanks, but I suggest reverting above commit instead.
> 
> 
> Regards,
> 
> 	Joerg
>