# Re: \[PATCH V7 2/5\] x86/hyper-v: Add hyperv Isolation VM check in the cc\_platform\_has()

- From: Borislav Petkov \<bp@alien8.de\>
- Date: 2021-12-14 16:05:09 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/12/1608287
- Thread: https://ratatoskr.run/linux-arch/2021/12/1605563/t.md

```text
On Mon, Dec 13, 2021 at 02:14:03AM -0500, Tianyu Lan wrote:
> From: Tianyu Lan <redacted>
> 
> Hyper-V provides Isolation VM for confidential computing support and
> guest memory is encrypted in it. Places checking cc_platform_has()
> with GUEST_MEM_ENCRYPT attr should return "True" in Isolation vm. e.g,

Stick to a single spelling variant: "VM".

> swiotlb bounce buffer size needs to adjust according to memory size
> in the sev_setup_arch().

So basically you wanna simply say here:

"Hyper-V Isolation VMs need to adjust the SWIOTLB size just like SEV
guests. Add a hyperv_cc_platform_has() variant which enables that."

?

With that addressed you can have my

Acked-by: Borislav Petkov <redacted>

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette
```