| Date | Thu, 18 May 2017 19:01:53 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH v5 31/32] x86: Add sysfs support for Secure Memory Encryption |
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On Tue, Apr 18, 2017 at 04:22:12PM -0500, Tom Lendacky wrote: > Add sysfs support for SME so that user-space utilities (kdump, etc.) can > determine if SME is active.
But why do user-space tools need to know that?
I mean, when we load the kdump kernel, we do it with the first kernel, with the kexec_load() syscall, AFAICT. And that code does a lot of things during that init, like machine_kexec_prepare()->init_pgtable() to prepare the ident mapping of the second kernel, for example.
What I'm aiming at is that the first kernel knows *exactly* whether SME is enabled or not and doesn't need to tell the second one through some sysfs entries - it can do that during loading.
So I don't think we need any userspace things at all...
Or?
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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