From patchwork Fri Jul 26 06:48:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 1137270 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=bt.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 45w06l1knCz9s8m for ; Fri, 26 Jul 2019 16:49:03 +1000 (AEST) Received: from localhost ([::1]:36775 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hqu2H-0006ZO-1T for incoming@patchwork.ozlabs.org; Fri, 26 Jul 2019 02:49:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57498) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hqu25-0006M5-AO for qemu-devel@nongnu.org; Fri, 26 Jul 2019 02:48:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hqu22-0006ed-RZ for qemu-devel@nongnu.org; Fri, 26 Jul 2019 02:48:48 -0400 Received: from smtpe1.intersmtp.com ([213.121.35.72]:22218) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hqu1n-0005ky-S5; Fri, 26 Jul 2019 02:48:32 -0400 Received: from tpw09926dag18e.domain1.systemhost.net (10.9.212.18) by BWP09926077.bt.com (10.36.82.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.1713.5; Fri, 26 Jul 2019 07:48:02 +0100 Received: from tpw09926dag18e.domain1.systemhost.net (10.9.212.18) by tpw09926dag18e.domain1.systemhost.net (10.9.212.18) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 26 Jul 2019 07:48:11 +0100 Received: from tpw09926dag18e.domain1.systemhost.net ([fe80::a946:6348:ccf4:fa6c]) by tpw09926dag18e.domain1.systemhost.net ([fe80::a946:6348:ccf4:fa6c%12]) with mapi id 15.00.1395.000; Fri, 26 Jul 2019 07:48:11 +0100 From: To: Thread-Topic: [Qemu-devel] [PATCH v5 12/15] cpu: TLB_FLAGS_MASK bit to force memory slow path Thread-Index: AQHVQ34Xl50l9Qcsrka92YvVcG8zww== Date: Fri, 26 Jul 2019 06:48:10 +0000 Message-ID: <1564123690507.53193@bt.com> References: <3106a3c959c4498fad13a5799c89ba7b@tpw09926dag18e.domain1.systemhost.net> In-Reply-To: <3106a3c959c4498fad13a5799c89ba7b@tpw09926dag18e.domain1.systemhost.net> Accept-Language: en-AU, en-GB, en-US Content-Language: en-AU X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.187.101.42] MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 213.121.35.72 X-Content-Filtered-By: Mailman/MimeDel 2.1.23 Subject: [Qemu-devel] [PATCH v5 12/15] cpu: TLB_FLAGS_MASK bit to force memory slow path X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, walling@linux.ibm.com, sagark@eecs.berkeley.edu, mst@redhat.com, palmer@sifive.com, mark.cave-ayland@ilande.co.uk, laurent@vivier.eu, Alistair.Francis@wdc.com, edgar.iglesias@gmail.com, arikalo@wavecomp.com, david@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, rth@twiddle.net, atar4qemu@gmail.com, ehabkost@redhat.com, qemu-s390x@nongnu.org, qemu-arm@nongnu.org, stefanha@redhat.com, shorne@gmail.com, david@gibson.dropbear.id.au, qemu-riscv@nongnu.org, kbastian@mail.uni-paderborn.de, cohuck@redhat.com, alex.williamson@redhat.com, qemu-ppc@nongnu.org, amarkovic@wavecomp.com, pbonzini@redhat.com, aurelien@aurel32.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The fast path is taken when TLB_FLAGS_MASK is all zero. TLB_FORCE_SLOW is simply a TLB_FLAGS_MASK bit to force the slow path, there are no other side effects. Signed-off-by: Tony Nguyen Reviewed-by: Richard Henderson --- include/exec/cpu-all.h | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) -- 1.8.3.1 diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 536ea58..e496f99 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -331,12 +331,18 @@ CPUArchState *cpu_copy(CPUArchState *env); #define TLB_MMIO (1 << (TARGET_PAGE_BITS - 3)) /* Set if TLB entry must have MMU lookup repeated for every access */ #define TLB_RECHECK (1 << (TARGET_PAGE_BITS - 4)) +/* Set if TLB entry must take the slow path. */ +#define TLB_FORCE_SLOW (1 << (TARGET_PAGE_BITS - 5)) /* Use this mask to check interception with an alignment mask * in a TCG backend. */ -#define TLB_FLAGS_MASK (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO \ - | TLB_RECHECK) +#define TLB_FLAGS_MASK \ + (TLB_INVALID_MASK \ + | TLB_NOTDIRTY \ + | TLB_MMIO \ + | TLB_RECHECK \ + | TLB_FORCE_SLOW) /** * tlb_hit_page: return true if page aligned @addr is a hit against the