Re: [PATCH 04/10] s390/mm: force swiotlb for protected virtualization

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On 29.04.19 16:05, Christian Borntraeger wrote:


On 29.04.19 15:59, Halil Pasic wrote:
On Fri, 26 Apr 2019 12:27:11 -0700
Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:

On Fri, Apr 26, 2019 at 08:32:39PM +0200, Halil Pasic wrote:
+EXPORT_SYMBOL_GPL(set_memory_encrypted);

+EXPORT_SYMBOL_GPL(set_memory_decrypted);

+EXPORT_SYMBOL_GPL(sev_active);

Why do you export these?  I know x86 exports those as well, but
it shoudn't be needed there either.


I export these to be in line with the x86 implementation (which
is the original and seems to be the only one at the moment). I assumed
that 'exported or not' is kind of a part of the interface definition.
Honestly, I did not give it too much thought.

For x86 set_memory(en|de)crypted got exported by 95cf9264d5f3 "x86, drm,
fbdev: Do not specify encrypted memory for video mappings" (Tom
Lendacky, 2017-07-17). With CONFIG_FB_VGA16=m seems to be necessary for x84.

If the consensus is don't export: I won't. I'm fine one way or the other.
@Christian, what is your take on this?

If we do not need it today for anything (e.g. virtio-gpu) then we can get rid
of the exports (and introduce them when necessary).

I'll take them out then.


Thank you very much!

Regards,
Halil







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