Commit 547edaca authored Mar 15, 2018 by Kirill A. Shutemov Committed by Thomas Gleixner Mar 27, 2018

x86/mm: Update comment in detect_tme() regarding x86_phys_bits



As Kai pointed out, the primary reason for adjusting x86_phys_bits is to
reflect that the the address space is reduced and not the ability to
communicate the available physical address space to virtual machines.

Suggested-by: Kai Huang <kai.huang@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: linux-mm@kvack.org
Link: https://lkml.kernel.org/r/20180315134907.9311-2-kirill.shutemov@linux.intel.com

parent fc5d1073

arch/x86/kernel/cpu/intel.c

+2 −5

Original line number	Diff line number	Diff line
		@@ -587,11 +587,8 @@ static void detect_tme(struct cpuinfo_x86 *c)
		}

		/*
		* Exclude KeyID bits from physical address bits.
		*
		* We have to do this even if we are not going to use KeyID bits
		* ourself. VM guests still have to know that these bits are not usable
		* for physical address.
		* KeyID bits effectively lower the number of physical address
		* bits. Update cpuinfo_x86::x86_phys_bits accordingly.
		*/
		c->x86_phys_bits -= keyid_bits;
		}