x86/head/64: Switch to initial stack earlier

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Make sure there is a stack once the kernel runs from virtual addresses.
At this stage any secondary CPU which boots will have lost its stack
because the kernel switched to a new page-table which does not map the
real-mode stack anymore.

This is needed for handling early #VC exceptions caused by instructions
like CPUID.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20200907131613.12703-33-joro@8bytes.org

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Joerg Roedel 2020-09-07 15:15:33 +02:00 • committed by Borislav Petkov

parent 7b99819dfb

commit 3add38cb96

1 changed files with 6 additions and 3 deletions

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arch/x86/kernel/head_64.S

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