Re: [Part2 PATCH v5.1 12.4/31] crypto: ccp: Implement SEV_PLATFORM_STATUS ioctl command

From: Borislav Petkov
Date: Wed Oct 11 2017 - 16:54:23 EST


On Wed, Oct 11, 2017 at 03:45:00PM -0500, Brijesh Singh wrote:
> OK, if userspace is going to pick bits apart then how about this:
>
> struct sev_data_status {
> u8 api_major; /* Out */
> u8 api_minor; /* Out */
> u8 state; /* Out */
> u32 flags; /* Out */
> u8 build; /* Out */

I guess. Except the spec marks those as 31:24 and belonging to the dword
starting at offset 4 and you've made "build" a separate u8 and the dword
starts at offset 3. I mean, not a big deal, I think you can change the
spec for a change :-)

Because it looks like the 4 bytes starting at offset 3 really are meant
for miscellaneous bits. And then CONFIG.ES could've been bit 1 of the
byte at offset 3. Oh well...

> Please let me know if you are okay with my above structure.

But yeah, in the end of the day it probably doesn't matter a whole lot.
The spec just counts those in 32-bit quantities.

--
Regards/Gruss,
Boris.

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