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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5724BCD98D2 for ; Tue, 16 Jun 2026 05:38:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:Message-ID:In-Reply-To:Date:From:Cc:To:Subject: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:References:List-Owner; bh=xbJzuHH5hYnsWt27euYYhAgh6I89idHnIBjsYCqeuBs=; b=hwRPiivhtw/JtaEAayVayPgjlT Syk8yrzj+MOtc1RjtNi0vnOw8iZhf+PPnyPmxne69nV5BB2ea3xwT0BBAPSu1zdLqQ1Jii0Ag1RAc iwrAngee+NzBmPOjwZyJoCRy68Cf9MtmKT7VYcDScC/MArkGEOjlO+Pce1y9+j2WzqUQ/k8vLqpjy Vr6vRilkhLhfTwynyYXNZfgPKS1JOQcvNu28X5Gtj3uW37c/BAZS1Xt6CXfS71HECalbbtQ1e9ASD vkwhde2XyQqcjPKK4Bkj56+BKp+w2KdA34PRY6x3sIFjPIgejjgxtO7ACinPSwYjJZJIH0Ii9xyWG NiFwV2QQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZMVW-0000000FFdI-2hna; Tue, 16 Jun 2026 05:38:42 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZMVV-0000000FFdB-0r2n for linux-arm-kernel@lists.infradead.org; Tue, 16 Jun 2026 05:38:41 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 79E2440203; Tue, 16 Jun 2026 05:38:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86BB71F00A3D; Tue, 16 Jun 2026 05:38:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781588320; bh=xbJzuHH5hYnsWt27euYYhAgh6I89idHnIBjsYCqeuBs=; h=Subject:To:Cc:From:Date:In-Reply-To; b=G6romRQ2qNXSdWMS29031sDAGcombNRs6bYQ+yXSYxF7Lab4xYhn3mmliTNX05qZV sHzV3z9YXVYeXEefU+gF6FM2oUyTGJ21ddI4m+96bULfgvkx2ShRi9kVLxZo20fgfP a42iTrASHVOv7DMjTYJJqBEz4CeH+fTrfBzqqPXE= Subject: Patch "arm64/mm: Enable batched TLB flush in unmap_hotplug_range()" has been added to the 5.15-stable tree To: anshuman.khandual@arm.com,catalin.marinas@arm.com,david@kernel.org,gregkh@linuxfoundation.org,linux-arm-kernel@lists.infradead.org,ryan.roberts@arm.com,sashal@kernel.org,will@kernel.org Cc: From: Date: Tue, 16 Jun 2026 11:02:03 +0530 In-Reply-To: <20260428185311.3151505-1-sashal@kernel.org> Message-ID: <2026061603-deduct-decaf-d039@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is a note to let you know that I've just added the patch titled arm64/mm: Enable batched TLB flush in unmap_hotplug_range() to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-mm-enable-batched-tlb-flush-in-unmap_hotplug_range.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From stable+bounces-241760-greg=kroah.com@vger.kernel.org Wed Apr 29 00:24:42 2026 From: Sasha Levin Date: Tue, 28 Apr 2026 14:53:11 -0400 Subject: arm64/mm: Enable batched TLB flush in unmap_hotplug_range() To: stable@vger.kernel.org Cc: Anshuman Khandual , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "David Hildenbrand (Arm)" , Ryan Roberts , Catalin Marinas , Sasha Levin Message-ID: <20260428185311.3151505-1-sashal@kernel.org> From: Anshuman Khandual [ Upstream commit 48478b9f791376b4b89018d7afdfd06865498f65 ] During a memory hot remove operation, both linear and vmemmap mappings for the memory range being removed, get unmapped via unmap_hotplug_range() but mapped pages get freed only for vmemmap mapping. This is just a sequential operation where each table entry gets cleared, followed by a leaf specific TLB flush, and then followed by memory free operation when applicable. This approach was simple and uniform both for vmemmap and linear mappings. But linear mapping might contain CONT marked block memory where it becomes necessary to first clear out all entire in the range before a TLB flush. This is as per the architecture requirement. Hence batch all TLB flushes during the table tear down walk and finally do it in unmap_hotplug_range(). Prior to this fix, it was hypothetically possible for a speculative access to a higher address in the contiguous block to fill the TLB with shattered entries for the entire contiguous range after a lower address had already been cleared and invalidated. Due to the table entries being shattered, the subsequent TLB invalidation for the higher address would not then clear the TLB entries for the lower address, meaning stale TLB entries could persist. Besides it also helps in improving the performance via TLBI range operation along with reduced synchronization instructions. The time spent executing unmap_hotplug_range() improved 97% measured over a 2GB memory hot removal in KVM guest. This scheme is not applicable during vmemmap mapping tear down where memory needs to be freed and hence a TLB flush is required after clearing out page table entry. Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Closes: https://lore.kernel.org/all/aWZYXhrT6D2M-7-N@willie-the-truck/ Fixes: bbd6ec605c0f ("arm64/mm: Enable memory hot remove") Cc: stable@vger.kernel.org Reviewed-by: David Hildenbrand (Arm) Reviewed-by: Ryan Roberts Signed-off-by: Ryan Roberts Signed-off-by: Anshuman Khandual Signed-off-by: Catalin Marinas [ replaced `__pte_clear()` with `pte_clear()` ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/arm64/mm/mmu.c | 36 ++++++++++++++++++++---------------- 1 file changed, 20 insertions(+), 16 deletions(-) --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -886,10 +886,14 @@ static void unmap_hotplug_pte_range(pmd_ WARN_ON(!pte_present(pte)); pte_clear(&init_mm, addr, ptep); - flush_tlb_kernel_range(addr, addr + PAGE_SIZE); - if (free_mapped) + if (free_mapped) { + /* CONT blocks are not supported in the vmemmap */ + WARN_ON(pte_cont(pte)); + flush_tlb_kernel_range(addr, addr + PAGE_SIZE); free_hotplug_page_range(pte_page(pte), PAGE_SIZE, altmap); + } + /* unmap_hotplug_range() flushes TLB for !free_mapped */ } while (addr += PAGE_SIZE, addr < end); } @@ -910,15 +914,14 @@ static void unmap_hotplug_pmd_range(pud_ WARN_ON(!pmd_present(pmd)); if (pmd_sect(pmd)) { pmd_clear(pmdp); - - /* - * One TLBI should be sufficient here as the PMD_SIZE - * range is mapped with a single block entry. - */ - flush_tlb_kernel_range(addr, addr + PAGE_SIZE); - if (free_mapped) + if (free_mapped) { + /* CONT blocks are not supported in the vmemmap */ + WARN_ON(pmd_cont(pmd)); + flush_tlb_kernel_range(addr, addr + PMD_SIZE); free_hotplug_page_range(pmd_page(pmd), PMD_SIZE, altmap); + } + /* unmap_hotplug_range() flushes TLB for !free_mapped */ continue; } WARN_ON(!pmd_table(pmd)); @@ -943,15 +946,12 @@ static void unmap_hotplug_pud_range(p4d_ WARN_ON(!pud_present(pud)); if (pud_sect(pud)) { pud_clear(pudp); - - /* - * One TLBI should be sufficient here as the PUD_SIZE - * range is mapped with a single block entry. - */ - flush_tlb_kernel_range(addr, addr + PAGE_SIZE); - if (free_mapped) + if (free_mapped) { + flush_tlb_kernel_range(addr, addr + PUD_SIZE); free_hotplug_page_range(pud_page(pud), PUD_SIZE, altmap); + } + /* unmap_hotplug_range() flushes TLB for !free_mapped */ continue; } WARN_ON(!pud_table(pud)); @@ -981,6 +981,7 @@ static void unmap_hotplug_p4d_range(pgd_ static void unmap_hotplug_range(unsigned long addr, unsigned long end, bool free_mapped, struct vmem_altmap *altmap) { + unsigned long start = addr; unsigned long next; pgd_t *pgdp, pgd; @@ -1002,6 +1003,9 @@ static void unmap_hotplug_range(unsigned WARN_ON(!pgd_present(pgd)); unmap_hotplug_p4d_range(pgdp, addr, next, free_mapped, altmap); } while (addr = next, addr < end); + + if (!free_mapped) + flush_tlb_kernel_range(start, end); } static void free_empty_pte_table(pmd_t *pmdp, unsigned long addr, Patches currently in stable-queue which might be from sashal@kernel.org are queue-5.15/bonding-refuse-to-enslave-can-devices.patch queue-5.15/asoc-intel-bytcht_es8316-fix-mclk-leak-on-init-error.patch queue-5.15/asoc-codecs-simple-mux-fix-enum-control-bounds-check.patch queue-5.15/bluetooth-l2cap-fix-possible-crash-on-l2cap_ecred_co.patch queue-5.15/ipv6-sit-reload-inner-ipv6-header-after-gso-offloads.patch queue-5.15/ethtool-eeprom-add-more-safeties-to-eeprom-netlink-f.patch queue-5.15/6lowpan-fix-off-by-one-in-multicast-context-address-.patch queue-5.15/randomize_kstack-maintain-kstack_offset-per-task.patch queue-5.15/sctp-fix-race-between-sctp_wait_for_connect-and-peel.patch queue-5.15/pcnet32-stop-holding-device-spin-lock-during-napi_co.patch queue-5.15/drm-vc4-fix-krealloc-memory-leak.patch queue-5.15/f2fs-fix-to-do-sanity-check-on-dcc-discard_cmd_cnt-conditionally.patch queue-5.15/arm64-tlb-optimize-arm64_workaround_repeat_tlbi.patch queue-5.15/nfc-llcp-fix-use-after-free-race-in-nfc_llcp_recv_cc.patch 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