x86/mm: Do not use paravirtualized calls in native_set_p4d()
In 4-level paging mode, native_set_p4d() updates the entry in the top-level page table. With PTI, update to the top-level kernel page table requires update to the userspace copy of the table as well, using pti_set_user_pgd(). native_set_p4d() uses p4d_val() and pgd_val() to convert types between p4d_t and pgd_t. p4d_val() and pgd_val() are paravirtualized and we must not use them in native helpers, as they crash the boot in paravirtualized environments. Replace p4d_val() and pgd_val() with native_p4d_val() and native_pgd_val() in native_set_p4d(). Reported-by:Fengguang Wu <fengguang.wu@intel.com> Signed-off-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 91f606a8 ("x86/mm: Replace compile-time checks for 5-level paging with runtime-time checks") Link: http://lkml.kernel.org/r/20180305081641.4290-1-kirill.shutemov@linux.intel.com Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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c100a583
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