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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
hifive-unleashed-5.1
Kirill A. Shutemov 2018-03-15 16:49:06 +03:00 committed by Thomas Gleixner
parent fc5d1073ca
commit 547edaca24
1 changed files with 2 additions and 5 deletions
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7
arch/x86/kernel/cpu/intel.c
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@ -587,11 +587,8 @@ detect_keyid_bits:
}
/*
* 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;
}