From patchwork Wed Jul 5 18:12:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Valentin Schneider X-Patchwork-Id: 13302594 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0155AC04A6A for ; Wed, 5 Jul 2023 18:19:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233465AbjGEST0 (ORCPT ); Wed, 5 Jul 2023 14:19:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233383AbjGESSj (ORCPT ); Wed, 5 Jul 2023 14:18:39 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E8A31BFD for ; Wed, 5 Jul 2023 11:17:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1688581041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=O0XyYRqaKclSpF/kJo4Izh2sg6d7OQ7Oy14ALgDyLr0=; b=jE1QJBXJxYWRKXUM7JGPZzZaHZW35aDfenAFgmKF+/qwKucoKMZHOKiNAeHfgwhSXpanVZ cw/wCMtY+ATasc1AgdO0aD+0cHuU5YmN8IQW3pba74XTYfFL2tSD3bkpsxz330rxyH2Lwo BGmGVARbFVwV+vgR/TDKMix5EDYyhXg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-528-mFoTFqj8OM6TsS7Ok5gs8A-1; Wed, 05 Jul 2023 14:17:17 -0400 X-MC-Unique: mFoTFqj8OM6TsS7Ok5gs8A-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 44FAB185A792; Wed, 5 Jul 2023 18:17:15 +0000 (UTC) Received: from vschneid.remote.csb (unknown [10.42.28.164]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C6AE518EB4; Wed, 5 Jul 2023 18:17:08 +0000 (UTC) From: Valentin Schneider To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, x86@kernel.org Cc: Steven Rostedt , Masami Hiramatsu , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Andy Lutomirski , Peter Zijlstra , Frederic Weisbecker , "Paul E. McKenney" , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Josh Poimboeuf , Kees Cook , Sami Tolvanen , Ard Biesheuvel , Nicholas Piggin , Juerg Haefliger , Nicolas Saenz Julienne , "Kirill A. Shutemov" , Nadav Amit , Dan Carpenter , Chuang Wang , Yang Jihong , Petr Mladek , "Jason A. Donenfeld" , Song Liu , Julian Pidancet , Tom Lendacky , Dionna Glaze , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= , Juri Lelli , Daniel Bristot de Oliveira , Marcelo Tosatti , Yair Podemsky Subject: [RFC PATCH 13/14] context_tracking,x86: Add infrastructure to defer kernel TLBI Date: Wed, 5 Jul 2023 19:12:55 +0100 Message-Id: <20230705181256.3539027-14-vschneid@redhat.com> In-Reply-To: <20230705181256.3539027-1-vschneid@redhat.com> References: <20230705181256.3539027-1-vschneid@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Kernel TLB invalidation IPIs are a common source of interference on NOHZ_FULL CPUs. Given NOHZ_FULL CPUs executing in userspace are not accessing any kernel addresses, these invalidations do not need to happen immediately, and can be deferred until the next user->kernel transition. Rather than make __flush_tlb_all() noinstr, add a minimal noinstr variant that doesn't try to leverage INVPCID. FIXME: not fully noinstr compliant XXX: same issue as with ins patching, when do we access data that should be invalidated? Signed-off-by: Valentin Schneider --- arch/x86/include/asm/context_tracking_work.h | 4 ++++ arch/x86/include/asm/tlbflush.h | 1 + arch/x86/mm/tlb.c | 17 +++++++++++++++++ include/linux/context_tracking_work.h | 2 ++ 4 files changed, 24 insertions(+) diff --git a/arch/x86/include/asm/context_tracking_work.h b/arch/x86/include/asm/context_tracking_work.h index 2c66687ce00e2..9d4f021b5a45b 100644 --- a/arch/x86/include/asm/context_tracking_work.h +++ b/arch/x86/include/asm/context_tracking_work.h @@ -3,6 +3,7 @@ #define _ASM_X86_CONTEXT_TRACKING_WORK_H #include +#include static __always_inline void arch_context_tracking_work(int work) { @@ -10,6 +11,9 @@ static __always_inline void arch_context_tracking_work(int work) case CONTEXT_WORK_SYNC: sync_core(); break; + case CONTEXT_WORK_TLBI: + __flush_tlb_all_noinstr(); + break; } } diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index 75bfaa4210303..9064aa0027d05 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -15,6 +15,7 @@ #include void __flush_tlb_all(void); +void noinstr __flush_tlb_all_noinstr(void); #define TLB_FLUSH_ALL -1UL #define TLB_GENERATION_INVALID 0 diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 267acf27480af..631df9189ded4 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -1237,6 +1237,23 @@ void __flush_tlb_all(void) } EXPORT_SYMBOL_GPL(__flush_tlb_all); +void noinstr __flush_tlb_all_noinstr(void) +{ + /* + * This is for invocation in early entry code that cannot be + * instrumented. A RMW to CR4 works for most cases, but relies on + * being able to flip either of the PGE or PCIDE bits. Flipping CR4.PCID + * would require also resetting CR3.PCID, so just try with CR4.PGE, else + * do the CR3 write. + * + * TODO: paravirt + */ + if (cpu_feature_enabled(X86_FEATURE_PGE)) + __native_tlb_flush_global(this_cpu_read(cpu_tlbstate.cr4)); + else + flush_tlb_local(); +} + void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch) { struct flush_tlb_info *info; diff --git a/include/linux/context_tracking_work.h b/include/linux/context_tracking_work.h index b0c7463048b60..c084a60d2fec5 100644 --- a/include/linux/context_tracking_work.h +++ b/include/linux/context_tracking_work.h @@ -7,12 +7,14 @@ enum { CONTEXT_WORK_DISABLED_OFFSET, CONTEXT_WORK_SYNC_OFFSET, + CONTEXT_WORK_TLBI_OFFSET, CONTEXT_WORK_MAX_OFFSET }; enum ct_work { CONTEXT_WORK_DISABLED = BIT(CONTEXT_WORK_DISABLED_OFFSET), CONTEXT_WORK_SYNC = BIT(CONTEXT_WORK_SYNC_OFFSET), + CONTEXT_WORK_TLBI = BIT(CONTEXT_WORK_TLBI_OFFSET), CONTEXT_WORK_MAX = BIT(CONTEXT_WORK_MAX_OFFSET) };