From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Lendacky Subject: [RFC PATCH v4 04/28] x86: Handle reduction in physical address size with SME Date: Thu, 16 Feb 2017 09:42:54 -0600 Message-ID: <20170216154253.19244.70114.stgit@tlendack-t1.amdoffice.net> References: <20170216154158.19244.66630.stgit@tlendack-t1.amdoffice.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170216154158.19244.66630.stgit@tlendack-t1.amdoffice.net> Sender: owner-linux-mm@kvack.org To: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.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 , Brijesh Singh , Ingo Molnar , Alexander Potapenko , Andy Lutomirski , "H. Peter Anvin" , Borislav Petkov , Andrey Ryabinin , Thomas Gleixner , Larry Woodman , Dmitry Vyukov List-Id: iommu@lists.linux-foundation.org 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 --- 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; } -- 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