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.lenda...@amd.com>
---
arch/x86/kernel/cpu/common.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index b33bc06..358208d7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -771,11 +771,15 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
u64 msr;
/*
- * For SME, BIOS support is required. If BIOS has not
- * enabled SME don't advertise the feature.
+ * For SME, BIOS support is required. If BIOS has
+ * enabled SME adjust x86_phys_bits by the SME
+ * physical address space reduction value. If BIOS
+ * has not enabled SME don't advertise the feature.
*/
rdmsrl(MSR_K8_SYSCFG, msr);
- if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT))
+ if (msr & MSR_K8_SYSCFG_MEM_ENCRYPT)
+ c->x86_phys_bits -= (ebx >> 6) & 0x3f;
+ else
eax &= ~0x01;
}
--
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