Messages in this thread | | | Subject | Re: [PATCHv5 08/19] x86/mm: Introduce variables to store number, shift and mask of KeyIDs | From | Dave Hansen <> | Date | Thu, 19 Jul 2018 07:23:27 -0700 |
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On 07/19/2018 03:21 AM, Kirill A. Shutemov wrote: > On Wed, Jul 18, 2018 at 04:19:10PM -0700, Dave Hansen wrote: >> On 07/17/2018 04:20 AM, Kirill A. Shutemov wrote: >>> mktme_nr_keyids holds number of KeyIDs available for MKTME, excluding >>> KeyID zero which used by TME. MKTME KeyIDs start from 1. >>> >>> mktme_keyid_shift holds shift of KeyID within physical address. >> I know what all these words mean, but the combination of them makes no >> sense to me. I still don't know what the variable does after reading this. >> >> Is this the lowest bit in the physical address which is used for the >> KeyID? How many bits you must shift up a KeyID to get to the location >> at which it can be masked into the physical address? > Right. > > I'm not sure what is not clear from the description. It look fine to me.
Well, OK, I guess I can write a better one for you.
"Position in the PTE of the lowest bit of the KeyID"
It's also a name that could use some love (now that I know what it does). mktme_keyid_pte_shift would be much better. Or mktme_keyid_low_pte_bit.
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