diff mbox

[RFC,v2,06/20] x86: Handle reduction in physical address size with SME

Message ID 20160822223634.29880.93825.stgit@tlendack-t1.amdoffice.net (mailing list archive)
State New, archived
Headers show

Commit Message

Tom Lendacky Aug. 22, 2016, 10:36 p.m. UTC 
When System Memory Encryption (SME) is enabled, the physical address
space is reduced. Adjust the x86_phys_bits value to reflect this
reduction.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 arch/x86/kernel/cpu/common.c |    2 ++
 1 file changed, 2 insertions(+)


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diff mbox

Patch

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index ce7a4c1..c0fe783 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -44,6 +44,7 @@ 
 #include <asm/pat.h>
 #include <asm/microcode.h>
 #include <asm/microcode_intel.h>
+#include <asm/mem_encrypt.h>
 
 #ifdef CONFIG_X86_LOCAL_APIC
 #include <asm/uv/uv.h>
@@ -736,6 +737,7 @@  void get_cpu_cap(struct cpuinfo_x86 *c)
 
 		c->x86_virt_bits = (eax >> 8) & 0xff;
 		c->x86_phys_bits = eax & 0xff;
+		c->x86_phys_bits -= sme_get_me_loss();
 		c->x86_capability[CPUID_8000_0008_EBX] = ebx;
 	}
 #ifdef CONFIG_X86_32