diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2019-04-14 17:59:47 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-04-17 12:55:18 +0200 |
| commit | 019b17b3ffe48100e52f609ca1c6ed6e5a40cba1 (patch) | |
| tree | 7518fa3bb5e7f75089345939ebb9ce275da4102d /arch/x86/mm/cpu_entry_area.c | |
| parent | 881a463cf21dbf83aab2cf6c9a359f34f88c2491 (diff) | |
x86/exceptions: Add structs for exception stacks
At the moment everything assumes a full linear mapping of the various
exception stacks. Adding guard pages to the cpu entry area mapping of the
exception stacks will break that assumption.
As a preparatory step convert both the real storage and the effective
mapping in the cpu entry area from character arrays to structures.
To ensure that both arrays have the same ordering and the same size of the
individual stacks fill the members with a macro. The guard size is the only
difference between the two resulting structures. For now both have guard
size 0 until the preparation of all usage sites is done.
Provide a couple of helper macros which are used in the following
conversions.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160144.506807893@linutronix.de
Diffstat (limited to 'arch/x86/mm/cpu_entry_area.c')
| -rw-r--r-- | arch/x86/mm/cpu_entry_area.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c index c2a54f75d335..6a09b84c13fe 100644 --- a/arch/x86/mm/cpu_entry_area.c +++ b/arch/x86/mm/cpu_entry_area.c @@ -13,8 +13,7 @@ static DEFINE_PER_CPU_PAGE_ALIGNED(struct entry_stack_page, entry_stack_storage); #ifdef CONFIG_X86_64 -static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks - [(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ]); +static DEFINE_PER_CPU_PAGE_ALIGNED(struct exception_stacks, exception_stacks); #endif struct cpu_entry_area *get_cpu_entry_area(int cpu) @@ -138,9 +137,8 @@ static void __init setup_cpu_entry_area(unsigned int cpu) #ifdef CONFIG_X86_64 BUILD_BUG_ON(sizeof(exception_stacks) % PAGE_SIZE != 0); BUILD_BUG_ON(sizeof(exception_stacks) != - sizeof(((struct cpu_entry_area *)0)->exception_stacks)); - cea_map_percpu_pages(&cea->exception_stacks, - &per_cpu(exception_stacks, cpu), + sizeof(((struct cpu_entry_area *)0)->estacks)); + cea_map_percpu_pages(&cea->estacks, &per_cpu(exception_stacks, cpu), sizeof(exception_stacks) / PAGE_SIZE, PAGE_KERNEL); #endif percpu_setup_debug_store(cpu); |