On Wed, Nov 16, 2022 at 12:01:11PM -0600, Kalra, Ashish wrote:
> Ok, so i will work on implementing this leaked pages list and put it on a
> sev/snp associated structure.
See __sgx_sanitize_pages() and the poison list there, for an example.
> Also to add here, we will actually get a not-present #PF instead of the RMP
> violation #PF on writing to these leaked pages, as these pages would have
> been removed from the kernel direct map.
So if you do the list and still have the kernel raise a RMP fault for
those pages, traversing that list in the RMP handler to check whether
the page is there on it, should be a lot faster operation than doing the
#PF thing and removing them from the direct map.
And sorry for misleading you about UPM - we were thinking wrong
yesterday.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
