diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2018-03-15 16:49:06 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-03-27 11:49:58 +0200 |
| commit | 547edaca247abf910e32f0cd883ba83b8fc6d0ed (patch) | |
| tree | fb804f3d82c12a579c416245f04ed427d30d170a /arch/x86 | |
| parent | fc5d1073cae299de4517755a910df4f12a6a438f (diff) | |
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
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/intel.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index 3f8d7a3b6447..6106d11ceb6b 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -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; } |