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authorKirill A. Shutemov <[email protected]>2018-03-15 16:49:06 +0300
committerThomas Gleixner <[email protected]>2018-03-27 11:49:58 +0200
commit547edaca247abf910e32f0cd883ba83b8fc6d0ed (patch)
treefb804f3d82c12a579c416245f04ed427d30d170a
parentfc5d1073cae299de4517755a910df4f12a6a438f (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 <[email protected]> Signed-off-by: Kirill A. Shutemov <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: Tom Lendacky <[email protected]> Cc: Dave Hansen <[email protected]> Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected]
-rw-r--r--arch/x86/kernel/cpu/intel.c7
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;
}