Re: [RFC PATCH] x86: Make sure verify_cpu has a good stack

[Borislav Petkov]

On Wed, Mar 02, 2016 at 11:22:30AM -0500, Brian Gerst wrote:
> This should be: movq stack_start(%rip), %rsp

No it wouldn't. That doesn't work.

> > +       subq    $__START_KERNEL_map, %rsp
> 
> It would be better to add the offset to the initializer for
> stack_start instead of adjusting it at runtime.  That would require
> moving the existing load of stack_start from the common path to the
> secondary startup,

This is the BSP we're talking about - no secondary startup. We want to run
verify_cpu as early as possible.

-- 
Regards/Gruss,
    Boris.

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