Messages in this thread | | | Date | Fri, 12 Jan 2024 21:07:51 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table |
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On Fri, Jan 12, 2024 at 12:00:01PM -0800, Dave Hansen wrote: > On 12/30/23 08:19, Michael Roth wrote: > > If the kernel uses a 2MB directmap mapping to write to an address, and > > that 2MB range happens to contain a 4KB page that set to private in the > > RMP table, that will also lead to a page-fault exception. > > I thought we agreed long ago to just demote the whole direct map to 4k > on kernels that might need to act as SEV-SNP hosts. That should be step > one and this can be discussed as an optimization later.
What would be the disadvantage here? Higher TLB pressure when running kernel code I guess...
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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