[PATCH v5 32/32] x86/mm: Add support to make use of Secure Memory Encryption

Borislav Petkov bp at alien8.de
Wed May 31 02:15:53 PDT 2017

On Tue, May 30, 2017 at 10:48:27AM -0500, Tom Lendacky wrote:
> I'll look at doing that instead of removing the support for the whole
> file.

Right, so I don't think the stack protector is even ready that early -
we do set it up later:

        /* Set up %gs.
         * The base of %gs always points to the bottom of the irqstack
         * union.  If the stack protector canary is enabled, it is
         * located at %gs:40.  Note that, on SMP, the boot cpu uses
         * init data section till per cpu areas are set up.
        movl    $MSR_GS_BASE,%ecx
        movl    initial_gs(%rip),%eax
        movl    initial_gs+4(%rip),%edx

so I think marking the function "no-stack-protector" is the only option
right now. We can always look at fixing that later.


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