From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755523AbdGXTPr (ORCPT ); Mon, 24 Jul 2017 15:15:47 -0400 Received: from mail-sn1nam01on0086.outbound.protection.outlook.com ([104.47.32.86]:3454 "EHLO NAM01-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753431AbdGXTKx (ORCPT ); Mon, 24 Jul 2017 15:10:53 -0400 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=brijesh.singh@amd.com; From: Brijesh Singh To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-efi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org Cc: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Borislav Petkov , Andy Lutomirski , Tony Luck , Piotr Luc , Tom Lendacky , Fenghua Yu , Lu Baolu , Reza Arbab , David Howells , Matt Fleming , "Kirill A . 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1;CY1PR12MB0150;20:1UNI1kHFpRZPyxnrEjYDfiXiEfOvhGEqKT3rZL3YvRhCyYGVzxVPg5eVjQ8nSZoX/f4AJ4fxHBI9cgkWS928gcvfHkFZqAyJg5U+R5LgI6sgCr6L5MQyu5n+XPe+Sv+faDZx4RijUN25DjqEGzyMG2Jc2HpQ/qCmyLCso7UhzK31wMpRPFljiR9o16lTlzv0kC+2Rh3Ytp4Nwe8BIIE1tkgssq6/4gS0wFUt2yMlR0qt+9OJKstpjTt0T723IK7p X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jul 2017 19:08:37.2783 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR12MB0150 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Lendacky Secure Encrypted Virtualization (SEV) does not support string I/O, so unroll the string I/O operation into a loop operating on one element at a time. Signed-off-by: Tom Lendacky Signed-off-by: Brijesh Singh --- arch/x86/include/asm/io.h | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index e080a39..2f3c002 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -327,14 +327,32 @@ static inline unsigned type in##bwl##_p(int port) \ \ static inline void outs##bwl(int port, const void *addr, unsigned long count) \ { \ - asm volatile("rep; outs" #bwl \ - : "+S"(addr), "+c"(count) : "d"(port)); \ + if (sev_active()) { \ + unsigned type *value = (unsigned type *)addr; \ + while (count) { \ + out##bwl(*value, port); \ + value++; \ + count--; \ + } \ + } else { \ + asm volatile("rep; outs" #bwl \ + : "+S"(addr), "+c"(count) : "d"(port)); \ + } \ } \ \ static inline void ins##bwl(int port, void *addr, unsigned long count) \ { \ - asm volatile("rep; ins" #bwl \ - : "+D"(addr), "+c"(count) : "d"(port)); \ + if (sev_active()) { \ + unsigned type *value = (unsigned type *)addr; \ + while (count) { \ + *value = in##bwl(port); \ + value++; \ + count--; \ + } \ + } else { \ + asm volatile("rep; ins" #bwl \ + : "+D"(addr), "+c"(count) : "d"(port)); \ + } \ } BUILDIO(b, b, char) -- 2.9.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [RFC Part1 PATCH v3 13/17] x86/io: Unroll string I/O when SEV is active Date: Mon, 24 Jul 2017 14:07:53 -0500 Message-ID: <20170724190757.11278-14-brijesh.singh@amd.com> References: <20170724190757.11278-1-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <20170724190757.11278-1-brijesh.singh@amd.com> Sender: kvm-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-efi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org Cc: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Borislav Petkov , Andy Lutomirski , Tony Luck , Piotr Luc , Tom Lendacky , Fenghua Yu , Lu Baolu , Reza Arbab , David Howells , Matt Fleming , "Kirill A . Shutemov" , Laura Abbott , Ard Biesheuvel , Andrew Morton , Eric Biederman , Benjamin Herrenschmidt Paul Mackerras

List-Id: linux-efi@vger.kernel.org From: Tom Lendacky Secure Encrypted Virtualization (SEV) does not support string I/O, so unroll the string I/O operation into a loop operating on one element at a time. Signed-off-by: Tom Lendacky Signed-off-by: Brijesh Singh --- arch/x86/include/asm/io.h | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index e080a39..2f3c002 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -327,14 +327,32 @@ static inline unsigned type in##bwl##_p(int port) \ \ static inline void outs##bwl(int port, const void *addr, unsigned long count) \ { \ - asm volatile("rep; outs" #bwl \ - : "+S"(addr), "+c"(count) : "d"(port)); \ + if (sev_active()) { \ + unsigned type *value = (unsigned type *)addr; \ + while (count) { \ + out##bwl(*value, port); \ + value++; \ + count--; \ + } \ + } else { \ + asm volatile("rep; outs" #bwl \ + : "+S"(addr), "+c"(count) : "d"(port)); \ + } \ } \ \ static inline void ins##bwl(int port, void *addr, unsigned long count) \ { \ - asm volatile("rep; ins" #bwl \ - : "+D"(addr), "+c"(count) : "d"(port)); \ + if (sev_active()) { \ + unsigned type *value = (unsigned type *)addr; \ + while (count) { \ + *value = in##bwl(port); \ + value++; \ + count--; \ + } \ + } else { \ + asm volatile("rep; ins" #bwl \ + : "+D"(addr), "+c"(count) : "d"(port)); \ + } \ } BUILDIO(b, b, char) -- 2.9.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [RFC Part1 PATCH v3 13/17] x86/io: Unroll string I/O when SEV is active Date: Mon, 24 Jul 2017 14:07:53 -0500 Message-ID: <20170724190757.11278-14-brijesh.singh@amd.com> References: <20170724190757.11278-1-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Borislav Petkov , Andy Lutomirski , Tony Luck , Piotr Luc , Tom Lendacky , Fenghua Yu , Lu Baolu , Reza Arbab , David Howells , Matt Fleming , "Kirill A . Shutemov" , Laura Abbott , Ard Biesheuvel , Andrew Morton , Eric Biederman , Benjamin Herrenschmidt , Paul Mackerras

Received: from mail-sn1nam01on0086.outbound.protection.outlook.com ([104.47.32.86]:3454 "EHLO NAM01-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753431AbdGXTKx (ORCPT ); Mon, 24 Jul 2017 15:10:53 -0400 In-Reply-To: <20170724190757.11278-1-brijesh.singh@amd.com> Sender: kvm-owner@vger.kernel.org List-ID: From: Tom Lendacky Secure Encrypted Virtualization (SEV) does not support string I/O, so unroll the string I/O operation into a loop operating on one element at a time. Signed-off-by: Tom Lendacky Signed-off-by: Brijesh Singh --- arch/x86/include/asm/io.h | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index e080a39..2f3c002 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -327,14 +327,32 @@ static inline unsigned type in##bwl##_p(int port) \ \ static inline void outs##bwl(int port, const void *addr, unsigned long count) \ { \ - asm volatile("rep; outs" #bwl \ - : "+S"(addr), "+c"(count) : "d"(port)); \ + if (sev_active()) { \ + unsigned type *value = (unsigned type *)addr; \ + while (count) { \ + out##bwl(*value, port); \ + value++; \ + count--; \ + } \ + } else { \ + asm volatile("rep; outs" #bwl \ + : "+S"(addr), "+c"(count) : "d"(port)); \ + } \ } \ \ static inline void ins##bwl(int port, void *addr, unsigned long count) \ { \ - asm volatile("rep; ins" #bwl \ - : "+D"(addr), "+c"(count) : "d"(port)); \ + if (sev_active()) { \ + unsigned type *value = (unsigned type *)addr; \ + while (count) { \ + *value = in##bwl(port); \ + value++; \ + count--; \ + } \ + } else { \ + asm volatile("rep; ins" #bwl \ + : "+D"(addr), "+c"(count) : "d"(port)); \ + } \ } BUILDIO(b, b, char) -- 2.9.4