From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964949AbcAYSh4 (ORCPT ); Mon, 25 Jan 2016 13:37:56 -0500 Received: from mail.kernel.org ([198.145.29.136]:33219 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964915AbcAYShs (ORCPT ); Mon, 25 Jan 2016 13:37:48 -0500 From: Andy Lutomirski To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Borislav Petkov , Brian Gerst , Dave Hansen , Linus Torvalds , Oleg Nesterov , "linux-mm@kvack.org" , Andrey Ryabinin , Andy Lutomirski Subject: [PATCH v2 1/3] x86/mm: Add INVPCID helpers Date: Mon, 25 Jan 2016 10:37:42 -0800 Message-Id: X-Mailer: git-send-email 2.5.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds helpers for each of the four currently-specified INVPCID modes. Signed-off-by: Andy Lutomirski --- arch/x86/include/asm/tlbflush.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index 6df2029405a3..20fc38d8478a 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -7,6 +7,47 @@ #include #include +static inline void __invpcid(unsigned long pcid, unsigned long addr, + unsigned long type) +{ + u64 desc[2] = { pcid, addr }; + + /* + * The memory clobber is because the whole point is to invalidate + * stale TLB entries and, especially if we're flushing global + * mappings, we don't want the compiler to reorder any subsequent + * memory accesses before the TLB flush. + */ + asm volatile ( + ".byte 0x66, 0x0f, 0x38, 0x82, 0x01" /* invpcid (%cx), %ax */ + : : "m" (desc), "a" (type), "c" (desc) : "memory"); +} + +/* Flush all mappings for a given pcid and addr, not including globals. */ +static inline void invpcid_flush_one(unsigned long pcid, + unsigned long addr) +{ + __invpcid(pcid, addr, 0); +} + +/* Flush all mappings for a given PCID, not including globals. */ +static inline void invpcid_flush_single_context(unsigned long pcid) +{ + __invpcid(pcid, 0, 1); +} + +/* Flush all mappings, including globals, for all PCIDs. */ +static inline void invpcid_flush_everything(void) +{ + __invpcid(0, 0, 2); +} + +/* Flush all mappings for all PCIDs except globals. */ +static inline void invpcid_flush_all_nonglobals(void) +{ + __invpcid(0, 0, 3); +} + #ifdef CONFIG_PARAVIRT #include #else -- 2.5.0