As Kai pointed, we adjust x86_phys_bits not only to communicate available physical address space to virtual machines, but mainly to reflect the fact that the address space is reduced. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Suggested-by: Kai Huang <kai.huang@xxxxxxxxxxxxxxx> --- arch/x86/kernel/cpu/intel.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index f0481b85c39d..fd379358c58d 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -619,11 +619,8 @@ static void detect_tme(struct cpuinfo_x86 *c) #endif /* - * 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 number of physical address bits. + * Let's update cpuinfo_x86::x86_phys_bits to reflect the fact. */ c->x86_phys_bits -= keyid_bits; } -- 2.16.1
