From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 6349A6B02FA for ; Tue, 27 Jun 2017 10:57:11 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id d5so28001111pfe.2 for ; Tue, 27 Jun 2017 07:57:11 -0700 (PDT) Received: from NAM01-BY2-obe.outbound.protection.outlook.com (mail-by2nam01on0084.outbound.protection.outlook.com. [104.47.34.84]) by mx.google.com with ESMTPS id 31si2215402plg.502.2017.06.27.07.57.10 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 27 Jun 2017 07:57:10 -0700 (PDT) From: Tom Lendacky Subject: [PATCH v8 05/38] x86/CPU/AMD: Handle SME reduction in physical address size Date: Tue, 27 Jun 2017 09:57:00 -0500 Message-ID: <20170627145700.15908.24923.stgit@tlendack-t1.amdoffice.net> In-Reply-To: <20170627145607.15908.26571.stgit@tlendack-t1.amdoffice.net> References: <20170627145607.15908.26571.stgit@tlendack-t1.amdoffice.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: 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, xen-devel@lists.xen.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Brijesh Singh , Toshimitsu Kani , Radim =?utf-8?b?S3LEjW3DocWZ?= , Matt Fleming , Alexander Potapenko , "H. Peter Anvin" , Larry Woodman , Jonathan Corbet , Joerg Roedel , "Michael S. Tsirkin" , Ingo Molnar , Andrey Ryabinin , Dave Young , Rik van Riel , Arnd Bergmann , Konrad Rzeszutek Wilk , Borislav Petkov , Andy Lutomirski , Boris Ostrovsky , Dmitry Vyukov , Juergen Gross , Thomas Gleixner , Paolo Bonzini When System Memory Encryption (SME) is enabled, the physical address space is reduced. Adjust the x86_phys_bits value to reflect this reduction. Reviewed-by: Borislav Petkov 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); } } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org