Messages in this thread | | | Date | Sat, 25 Aug 2018 06:47:49 +0200 | From | Borislav Petkov <> | Subject | Re: SEV guest regression in 4.18 |
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On Fri, Aug 24, 2018 at 01:47:10PM -0500, Brijesh Singh wrote: > I am more inclined towards creating a new section with PMD aligned and > sized. This section will contains the decrypted data. In early > boot code we will update the mapping with C=0. If caller wants to create > a shared variable then it can do so with: > > static int foo __decrypted;
Right, and keeping the SEV-ES's GHCB in mind, you could make that section extensible so that the GHCB's 4K page can land there too. Maybe something like a PMD-aligned range of 4K pages which are fully defined and which hypervisor and guest can share and can be used for all kinds of communication in the future...
-- Regards/Gruss, Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
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