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 7075DCCD18E for ; Wed, 15 Oct 2025 08:28:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CA8EE8E0018; Wed, 15 Oct 2025 04:28:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C587D8E0002; Wed, 15 Oct 2025 04:28:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B95A98E0018; Wed, 15 Oct 2025 04:28:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id A95018E0002 for ; Wed, 15 Oct 2025 04:28:44 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 7766C88B73 for ; Wed, 15 Oct 2025 08:28:44 +0000 (UTC) X-FDA: 83999672568.08.73F3D9B Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf01.hostedemail.com (Postfix) with ESMTP id D571240005 for ; Wed, 15 Oct 2025 08:28:42 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf01.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=1760516923; 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=kYmPJ6r7KmFHWtiLUTbtWuCWMRTotHkS2m3cSns0zQ0=; b=0aimDHdI9w2pF21Xf97bEUlt8/iBHVhAUtwJQHe4s7qcbVxVI3uM/dsF5T97h/O0zVlfge ltG0GlKdq5i4nN4QHd+im19znHJQrkINRwrfvOjl8J725HhsHWJpIt8py/Cbu2PrTBKutP H5PsS3PXtaO5046JHNveT7N1NArF4qg= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1760516923; a=rsa-sha256; cv=none; b=pl2Ovk/MA0CcgRT+Q+iTeEVHEPi40fGNV1ysGJbfp9Ogduat8eTwcMVnv9ACuwjPTVRpyg gd32hC93LtCmIUnFlOAMmXjFsdvKi0f0Ltp1slF9sOHF2gV1R8LDXyaXAHHUlS3TkTrE0W 4c7IZ3U6T3lFCWp1gm5Rt+s5z8nJrJM= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf01.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com 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 2EB672364; Wed, 15 Oct 2025 01:28:34 -0700 (PDT) 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 2ADB43F66E; Wed, 15 Oct 2025 01:28:37 -0700 (PDT) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Alexander Gordeev , Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , "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 , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , 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 Subject: [PATCH v3 11/13] x86/xen: use lazy_mmu_state when context-switching Date: Wed, 15 Oct 2025 09:27:25 +0100 Message-ID: <20251015082727.2395128-12-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20251015082727.2395128-1-kevin.brodsky@arm.com> References: <20251015082727.2395128-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: D571240005 X-Rspamd-Server: rspam02 X-Stat-Signature: hm47repfro5wchdxnmouz78tbm5z3d6g X-HE-Tag: 1760516922-500922 X-HE-Meta: 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 Vis4X/4D MDA3ECBMoisslTPW0YMp5o9BIMI2eHTuUqhUmYbPS6NiCAG2lzBfDpwD/UYHvQJSdewYqiOKqaLLtxd+x8mJYzYJ5f7UyLsV0At1D6nEnqTUVLUz2KumrTMRuv/0ZvPAasfeZb39OiYlxjFbCkc+2v2a+zwum0pf1T0qXVsyMLdzjXWlrTR3Cn19B7L1Oqu33twa24775RAczecI= 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. 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..9fabe83e7546 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 (next->lazy_mmu_state.enabled) arch_enter_lazy_mmu_mode(); } -- 2.47.0