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x86/cpu_entry_area: Provide exception stack accessor 

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
This commit is contained in:
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
View File

@ -99,6 +99,7 @@ struct cpu_entry_area {
#define CPU_ENTRY_AREA_TOT_SIZE (CPU_ENTRY_AREA_SIZE * NR_CPUS)
DECLARE_PER_CPU(struct cpu_entry_area *, cpu_entry_area);
DECLARE_PER_CPU(struct cea_exception_stacks *, cea_exception_stacks);
extern void setup_cpu_entry_areas(void);
extern void cea_set_pte(void *cea_vaddr, phys_addr_t pa, pgprot_t flags);
@ -118,4 +119,7 @@ static inline struct entry_stack *cpu_entry_stack(int cpu)
return &get_cpu_entry_area(cpu)->entry_stack_page.stack;
}
#define __this_cpu_ist_top_va(name) \
CEA_ESTACK_TOP(__this_cpu_read(cea_exception_stacks), name)
#endif

4
arch/x86/mm/cpu_entry_area.c
View File

@ -14,6 +14,7 @@ static DEFINE_PER_CPU_PAGE_ALIGNED(struct entry_stack_page, entry_stack_storage)
#ifdef CONFIG_X86_64
static DEFINE_PER_CPU_PAGE_ALIGNED(struct exception_stacks, exception_stacks);
DEFINE_PER_CPU(struct cea_exception_stacks*, cea_exception_stacks);
#endif
struct cpu_entry_area *get_cpu_entry_area(int cpu)
@ -92,6 +93,9 @@ static void __init percpu_setup_exception_stacks(unsigned int cpu)
unsigned int npages;
BUILD_BUG_ON(sizeof(exception_stacks) % PAGE_SIZE != 0);
per_cpu(cea_exception_stacks, cpu) = &cea->estacks;
/*
* The exceptions stack mappings in the per cpu area are protected
* by guard pages so each stack must be mapped separately.