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 B178CC47077 for ; Mon, 15 Jan 2024 02:39:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:To:References:Message-Id:Cc:Date: In-Reply-To:From:Subject:Mime-Version:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=IHFzOaOsF8oMLXDHjTr8WmuHHaURdbkGYdOA/5LToUc=; b=kgcZA3w8xIwIxb OzzvntkySQMlAxBUTr53CYrqUJyhzpgxcHBj3iFbRP+YiRci83y9tIgenxLI4vIQ1D90D+KQU4/Rp AavHGQbJFk2KVRsIEIAX5qTeNJu0iwX8cU9e+LIcHr8FoLN5xOtA3PfgIRIxEis2gw0+Og4aQQ0go Qe9FlBhmVCvflUJFSj1dvPzDF4XCM1xgvtf57VNJNX789YR+KuN/1HdRscmYBbDvKT11FxzEw6Ls3 xzi1+QPQYQSdnDZ06ne0n1WYb7/kNHOYPZPCNPuYkGtPJshAkODVG7WXqhQdQ7tkNIl+kqwEEjG2u CFXF/ZrE/Vz8ldIIMS+A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rPCsL-007eHi-1n; Mon, 15 Jan 2024 02:38:57 +0000 Received: from out-180.mta0.migadu.com ([2001:41d0:1004:224b::b4]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rPCsI-007eH6-0X for linux-arm-kernel@lists.infradead.org; Mon, 15 Jan 2024 02:38:56 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1705286326; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sp0cDtoYBXFSyeoKR1ttkzmASwj02Q4AD67oZUkHwXc=; b=XZRgQXP5sE2No4rkATbsAoJnuqqsqEbYQa0Zg4rPYii5zZrAPp4V8gKmgcgwHsWtdMy5zy dXUBdFoRzitSlO8gXIEgJYBWS+BnUsFt2g8xCszuVU+q3UQHCd3Sr0I7pi+i+z3cvTFKqO CCavEgfv5nOnxO31o6SUEKCxQU47X2Q= Mime-Version: 1.0 Subject: Re: [PATCH v3 2/3] arm64: mm: HVO: support BBM of vmemmap pgtable safely X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Muchun Song In-Reply-To: <20240113094436.2506396-3-sunnanyong@huawei.com> Date: Mon, 15 Jan 2024 10:38:07 +0800 Cc: Catalin Marinas , Will Deacon , Mike Kravetz , akpm@linux-foundation.org, anshuman.khandual@arm.com, willy@infradead.org, wangkefeng.wang@huawei.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Message-Id: References: <20240113094436.2506396-1-sunnanyong@huawei.com> <20240113094436.2506396-3-sunnanyong@huawei.com> To: Nanyong Sun X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240114_183854_629686_7CB22F3E X-CRM114-Status: UNSURE ( 9.07 ) X-CRM114-Notice: Please train this message. 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > On Jan 13, 2024, at 17:44, Nanyong Sun wrote: > > Implement vmemmap_update_pmd and vmemmap_update_pte on arm64 to do > BBM(break-before-make) logic when change the page table of vmemmap > address, they will under the init_mm.page_table_lock. > If a translation fault of vmemmap address concurrently happened after > pte/pmd cleared, vmemmap page fault handler will acquire the > init_mm.page_table_lock to wait for vmemmap update to complete, > by then the virtual address is valid again, so PF can return and > access can continue. > In other case, do the traditional kernel fault. > > Implement vmemmap_flush_tlb_all/range on arm64 with nothing > to do because tlb already flushed in every single BBM. > > Signed-off-by: Nanyong Sun Reviewed-by: Muchun Song Thanks. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel