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| author | Thomas Gleixner <tglx@linutronix.de> | 2019-04-14 17:59:49 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-04-17 13:00:22 +0200 |
| commit | 7623f37e411156e6e09b95cf5c76e509c5fda640 (patch) | |
| tree | 4453bae0400beefac913febe3d0d75112ab5224f /arch/x86/mm | |
| parent | x86/cpu_entry_area: Prepare for IST guard pages (diff) | |
| download | linux-7623f37e411156e6e09b95cf5c76e509c5fda640.tar.xz linux-7623f37e411156e6e09b95cf5c76e509c5fda640.zip | |
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
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/cpu_entry_area.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c index 2b1407662a6d..a00d0d059c8a 100644 --- a/arch/x86/mm/cpu_entry_area.c +++ b/arch/x86/mm/cpu_entry_area.c @@ -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. |