From nobody Tue Dec 16 08:57:50 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9D976334373; Mon, 15 Dec 2025 15:04:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765811093; cv=none; b=XORvgWHq9+cbvBdPDtFmAXufRPvaS493tongIkCUNd6mvDFbOxiktyBL8aZCeCSTmnGnZR8n4AJ7GXMiQs42tR/QyqF9TWV4Ly2WJ0yJYIB5Yi7EQ3Im4LmX0WMLxX1hELPFUgQGLUjsgjt+K7sdo2bBIjBYMpRDBt3x87KCKAc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765811093; c=relaxed/simple; bh=SkQRSo4quAm87O9InyuAZz0iR7CSa/+9rhyfGhbC5WE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=g5GYnCbgkRZtQat2KZ+22NReOZnf1pmZtd4jdGZfHoysOcFifyQHOXYH9DmiTOivvcqDossXs8WZo/f9MmvJq4PeAVFx+U1MnmdWmjrDpywPFrsRuaOLtCZvV6RQhGgDy5K42s1BVb+eRMwJKttbHzs3CVdcohhI6UqLeE5PkEM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=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 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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/thre= ad_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 */ =20 #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) =20 /* 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) =20 if (this_cpu_read(xen_lazy_mode) =3D=3D 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) =20 xen_mc_flush(); leave_lazy(XEN_LAZY_CPU); - if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UP= DATES)) + if (__task_lazy_mmu_mode_active(next)) arch_enter_lazy_mmu_mode(); } =20 --=20 2.51.2