From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BFC76D5B17F for ; Mon, 15 Dec 2025 15:04:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2A7156B0031; Mon, 15 Dec 2025 10:04:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 256CB6B0062; Mon, 15 Dec 2025 10:04:54 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0F86C6B007B; Mon, 15 Dec 2025 10:04:54 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id EE6DE6B0031 for ; Mon, 15 Dec 2025 10:04:53 -0500 (EST) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 9F6CF13A4C8 for ; Mon, 15 Dec 2025 15:04:53 +0000 (UTC) X-FDA: 84222027666.15.12633E7 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf02.hostedemail.com (Postfix) with ESMTP id C89AB80008 for ; Mon, 15 Dec 2025 15:04:51 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf02.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1765811092; a=rsa-sha256; cv=none; b=MHWSDeExqUY5OSny2BqecvFCx+6bKDwhVp6x2yVD+LsFGHGcY38AfuJ9cqhFqqtaEBkpb3 w7vVxLPSVp5cIcaxFb4twRM2cW/CPi+h2TE05sSzBwzMZH7BccQGTFv23BeDB0z6k3koup s512V9ErNjQ4EMwUBLowowJCu+HHdAw= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf02.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1765811092; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xxSLVM+IHWkxynMc81b6HpOJrhDmgKn1o6W8d+VcpvU=; b=wAOUKDFABG+4Ogzx11Xnp46loH4oUBFzve1C0VRH5SFhKM1bDvnjKegwCkkSDmSKqcsTv4 RgbiCSPPqWKlqUEb3NZqXCFyiht+JWsg/FgdkhguqqW9Hdck1jn4y+l/ABPkjDNqOnI4g8 5hpXL7Rs3wWQYr1v18zR60BTy7qWs/w= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C3DCB16F3; Mon, 15 Dec 2025 07:04:43 -0800 (PST) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 858633F73B; Mon, 15 Dec 2025 07:04:45 -0800 (PST) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Alexander Gordeev , Andreas Larsson , Andrew Morton , Anshuman Khandual , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , David Woodhouse , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , "Ritesh Harjani (IBM)" , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Venkat Rao Bagalkote , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, "David Hildenbrand (Red Hat)" Subject: [PATCH v6 13/14] x86/xen: use lazy_mmu_state when context-switching Date: Mon, 15 Dec 2025 15:03:22 +0000 Message-ID: <20251215150323.2218608-14-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251215150323.2218608-1-kevin.brodsky@arm.com> References: <20251215150323.2218608-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C89AB80008 X-Stat-Signature: w4mqjrsyfwzqccfcy7zbxsjwazfwwwqd X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1765811091-693064 X-HE-Meta: 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 ftM5M0ed tgr6usmsS41yC9U+3M9mrR7qDgTgN0II+YpPX/yoCn3C/NpPTDfwJIMThVjr/2dCWcHAqomfCPVictdMB5yQ3wLrN9x+HysZGRdJFDypL15fhxQrMC2ITSu+vs9dI4R2VSkRLp9yqZ4GfzlyuvNlhZdxxbFez4FnfAXuDahDrAP1dMEsDRxSqhIjCrL7gUOjetxndA3BYlEKznR8FC9f5GzL8pUjQclKwcKeAVzzlcYCnDMlaUqgT6Afytsk+SEL/8QQqzOwmtrwJpQiluXXoYiILOK6nfcMapQZLQ6TN1zvfdeWzvNq6i9mc0ULbpm7QNku6u/TX4QvzY5jJuiD1H5G0qkbET6Z2DUPx X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: We currently set a TIF flag when scheduling out a task that is in lazy MMU mode, in order to restore it when the task is scheduled again. The generic lazy_mmu layer now tracks whether a task is in lazy MMU mode in task_struct::lazy_mmu_state. We can therefore check that state when switching to the new task, instead of using a separate TIF flag. Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Juergen Gross Signed-off-by: Kevin Brodsky --- arch/x86/include/asm/thread_info.h | 4 +--- arch/x86/xen/enlighten_pv.c | 3 +-- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index e71e0e8362ed..0067684afb5b 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -100,8 +100,7 @@ struct thread_info { #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ #define TIF_SINGLESTEP 25 /* reenable singlestep on user return*/ #define TIF_BLOCKSTEP 26 /* set when we want DEBUGCTLMSR_BTF */ -#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */ -#define TIF_ADDR32 28 /* 32-bit address space on 64 bits */ +#define TIF_ADDR32 27 /* 32-bit address space on 64 bits */ #define _TIF_SSBD BIT(TIF_SSBD) #define _TIF_SPEC_IB BIT(TIF_SPEC_IB) @@ -114,7 +113,6 @@ struct thread_info { #define _TIF_FORCED_TF BIT(TIF_FORCED_TF) #define _TIF_BLOCKSTEP BIT(TIF_BLOCKSTEP) #define _TIF_SINGLESTEP BIT(TIF_SINGLESTEP) -#define _TIF_LAZY_MMU_UPDATES BIT(TIF_LAZY_MMU_UPDATES) #define _TIF_ADDR32 BIT(TIF_ADDR32) /* flags to check in __switch_to() */ diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 4806cc28d7ca..98dbb6a61087 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -426,7 +426,6 @@ static void xen_start_context_switch(struct task_struct *prev) if (this_cpu_read(xen_lazy_mode) == XEN_LAZY_MMU) { arch_leave_lazy_mmu_mode(); - set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES); } enter_lazy(XEN_LAZY_CPU); } @@ -437,7 +436,7 @@ static void xen_end_context_switch(struct task_struct *next) xen_mc_flush(); leave_lazy(XEN_LAZY_CPU); - if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES)) + if (__task_lazy_mmu_mode_active(next)) arch_enter_lazy_mmu_mode(); } -- 2.51.2