From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752317AbdFGTOo (ORCPT ); Wed, 7 Jun 2017 15:14:44 -0400 Received: from mail-sn1nam02on0051.outbound.protection.outlook.com ([104.47.36.51]:31409 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752272AbdFGTOf (ORCPT ); Wed, 7 Jun 2017 15:14:35 -0400 Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=amd.com; From: Tom Lendacky Subject: [PATCH v6 05/34] x86/CPU/AMD: Handle SME reduction in physical address size To: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Rik van Riel , Radim =?utf-8?b?S3LEjW3DocWZ?= , Toshimitsu Kani , Arnd Bergmann , Jonathan Corbet , Matt Fleming , "Michael S. Tsirkin" , Joerg Roedel , Konrad Rzeszutek Wilk , Paolo Bonzini , Larry Woodman , Brijesh Singh , Ingo Molnar , Borislav Petkov , Andy Lutomirski , "H. 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Adjust the x86_phys_bits value to reflect this reduction. Signed-off-by: Tom Lendacky --- arch/x86/kernel/cpu/amd.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index c47ceee..5bdcbd4 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -613,15 +613,19 @@ static void early_init_amd(struct cpuinfo_x86 *c) set_cpu_bug(c, X86_BUG_AMD_E400); /* - * BIOS support is required for SME. If BIOS has not enabled SME - * then don't advertise the feature (set in scattered.c) + * BIOS support is required for SME. If BIOS has enabld SME then + * adjust x86_phys_bits by the SME physical address space reduction + * value. If BIOS has not enabled SME then don't advertise the + * feature (set in scattered.c). */ if (cpu_has(c, X86_FEATURE_SME)) { u64 msr; /* Check if SME is enabled */ rdmsrl(MSR_K8_SYSCFG, msr); - if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT)) + if (msr & MSR_K8_SYSCFG_MEM_ENCRYPT) + c->x86_phys_bits -= (cpuid_ebx(0x8000001f) >> 6) & 0x3f; + else clear_cpu_cap(c, X86_FEATURE_SME); } }