# Re: \[PATCH 02/11\] x86/sev: Add an x86 version of prot\_guest\_has()

- From: Christoph Hellwig \<hch@infradead.org\>
- Date: 2021-07-28 13:24:17 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/07/211176
- Thread: https://ratatoskr.run/linuxppc-dev/2021/07/211118/t.md

```text
On Tue, Jul 27, 2021 at 05:26:05PM -0500, Tom Lendacky via iommu wrote:
> Introduce an x86 version of the prot_guest_has() function. This will be
> used in the more generic x86 code to replace vendor specific calls like
> sev_active(), etc.
> 
> While the name suggests this is intended mainly for guests, it will
> also be used for host memory encryption checks in place of sme_active().
> 
> The amd_prot_guest_has() function does not use EXPORT_SYMBOL_GPL for the
> same reasons previously stated when changing sme_active(), sev_active and

None of that applies here as none of the callers get pulled into
random macros.  The only case of that is sme_me_mask through
sme_mask, but that's not something this series replaces as far as I can
tell.
```