Kirill A. Shutemov 16877a5570 x86/mm: Fix guard hole handling ... There is a guard hole at the beginning of the kernel address space, also used by hypervisors. It occupies 16 PGD entries. This reserved range is not defined explicitely, it is calculated relative to other entities: direct mapping and user space ranges. The calculation got broken by recent changes of the kernel memory layout: LDT remap range is now mapped before direct mapping and makes the calculation invalid. The breakage leads to crash on Xen dom0 boot[1]. Define the reserved range explicitely. It's part of kernel ABI (hypervisors expect it to be stable) and must not depend on changes in the rest of kernel memory layout. [1] https://lists.xenproject.org/archives/html/xen-devel/2018-11/msg03313.html Fixes: d52888aa27 ("x86/mm: Move LDT remap out of KASLR region on 5-level paging") Reported-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com> Reviewed-by: Juergen Gross <jgross@suse.com> Cc: bp@alien8.de Cc: hpa@zytor.com Cc: dave.hansen@linux.intel.com Cc: luto@kernel.org Cc: peterz@infradead.org Cc: boris.ostrovsky@oracle.com Cc: bhe@redhat.com Cc: linux-mm@kvack.org Cc: xen-devel@lists.xenproject.org Link: https://lkml.kernel.org/r/20181130202328.65359-2-kirill.shutemov@linux.intel.com		2018-12-11 11:19:24 +01:00
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asm	x86/mm: Fix guard hole handling	2018-12-11 11:19:24 +01:00
uapi/asm	x86/acpi, x86/boot: Take RSDP address from boot params if available	2018-11-20 09:43:11 +01:00