Messages in this thread | | | Date | Wed, 16 Nov 2022 19:33:27 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH Part2 v6 14/49] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled |
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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
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