x86/cpu_entry_area: Provide exception stack accessor

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Store a pointer to the per cpu entry area exception stack mappings to allow
fast retrieval.

Required for converting various places from using the shadow IST array to
directly doing address calculations on the actual mapping address.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160144.680960459@linutronix.de

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Thomas Gleixner 2019-04-14 17:59:49 +02:00 • committed by Borislav Petkov

parent a4af767ae5

commit 7623f37e41

2 changed files with 8 additions and 0 deletions

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4

arch/x86/include/asm/cpu_entry_area.h

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4

arch/x86/mm/cpu_entry_area.c

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