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b1378a561f
Introduce FS/GS base access functionality via <asm/fsgsbase.h>, not yet used by anything directly. Factor out task_seg_base() from x86/ptrace.c and rename it to x86_fsgsbase_read_task() to make it part of the new helpers. This will allow us to enhance FSGSBASE support and eventually enable the FSBASE/GSBASE instructions. An "inactive" GS base refers to a base saved at kernel entry and being part of an inactive, non-running/stopped user-task. (The typical ptrace model.) Here are the new functions: x86_fsbase_read_task() x86_gsbase_read_task() x86_fsbase_write_task() x86_gsbase_write_task() x86_fsbase_read_cpu() x86_fsbase_write_cpu() x86_gsbase_read_cpu_inactive() x86_gsbase_write_cpu_inactive() As an advantage of the unified namespace we can now see all FS/GSBASE API use in the kernel via the following 'git grep' pattern: $ git grep x86_.*sbase [ mingo: Wrote new changelog. ] Based-on-code-from: Andy Lutomirski <luto@kernel.org> Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1537312139-5580-3-git-send-email-chang.seok.bae@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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