x86/xen: Add pvh specific rsdp address retrieval function
authorJuergen Gross <jgross@suse.com>
Mon, 19 Feb 2018 10:09:06 +0000 (11:09 +0100)
committerIngo Molnar <mingo@kernel.org>
Mon, 26 Feb 2018 07:43:20 +0000 (08:43 +0100)
commitb17d9d1df3c33a4f1d2bf397e2257aecf9dc56d4
tree521465d7fe6f55c4d82f13fede1e2331c16da259
parent038bac2b02989acf1fc938cedcb7944c02672b9f
x86/xen: Add pvh specific rsdp address retrieval function

Add pvh_get_root_pointer() for Xen PVH guests to communicate the
address of the RSDP table given to the kernel via Xen start info.

This makes the kernel boot again in PVH mode after on recent Xen the
RSDP was moved to higher addresses. So up to that change it was pure
luck that the legacy method to locate the RSDP was working when
running as PVH mode.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: boris.ostrovsky@oracle.com
Cc: lenb@kernel.org
Cc: linux-acpi@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20180219100906.14265-4-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/xen/enlighten_pvh.c