From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f42.google.com (mail-pa0-f42.google.com [209.85.220.42]) by kanga.kvack.org (Postfix) with ESMTP id E40066B0261 for ; Fri, 8 Jan 2016 18:15:39 -0500 (EST) Received: by mail-pa0-f42.google.com with SMTP id yy13so196754090pab.3 for ; Fri, 08 Jan 2016 15:15:39 -0800 (PST) Received: from mail.kernel.org (mail.kernel.org. [198.145.29.136]) by mx.google.com with ESMTP id xj5si66138734pab.84.2016.01.08.15.15.39 for ; Fri, 08 Jan 2016 15:15:39 -0800 (PST) From: Andy Lutomirski Subject: [RFC 02/13] x86/mm: Add INVPCID helpers Date: Fri, 8 Jan 2016 15:15:20 -0800 Message-Id: <21ffa5af2491feec9927446451e3d23548a7cbc0.1452294700.git.luto@kernel.org> In-Reply-To: References: In-Reply-To: References: Sender: owner-linux-mm@kvack.org List-ID: To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Borislav Petkov , Brian Gerst , Dave Hansen , Linus Torvalds , Oleg Nesterov , "linux-mm@kvack.org" , Andy Lutomirski 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 -- 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