From patchwork Sat Sep 9 13:04:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michael Tokarev X-Patchwork-Id: 1831904 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RjYGg0FNTz1ygR for ; Sat, 9 Sep 2023 23:09:31 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qexeU-0006a7-Kz; Sat, 09 Sep 2023 09:05:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qexeT-0006Zn-Ao; Sat, 09 Sep 2023 09:05:29 -0400 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qexeP-0003UQ-TK; Sat, 09 Sep 2023 09:05:28 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 1DB0E205D2; Sat, 9 Sep 2023 16:06:04 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id D762926E25; Sat, 9 Sep 2023 16:05:12 +0300 (MSK) Received: (nullmailer pid 354275 invoked by uid 1000); Sat, 09 Sep 2023 13:05:11 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Dongli Zhang , Joe Jin , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Michael Tokarev Subject: [Stable-7.2.6 05/37] dump: kdump-zlib data pages not dumped with pvtime/aarch64 Date: Sat, 9 Sep 2023 16:04:35 +0300 Message-Id: <20230909130511.354171-5-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Dongli Zhang The kdump-zlib data pages are not dumped from aarch64 host when the 'pvtime' is involved, that is, when the block->target_end is not aligned to page_size. In the below example, it is expected to dump two blocks. (qemu) info mtree -f ... ... 00000000090a0000-00000000090a0fff (prio 0, ram): pvtime KVM ... ... 0000000040000000-00000001bfffffff (prio 0, ram): mach-virt.ram KVM ... ... However, there is an issue with get_next_page() so that the pages for "mach-virt.ram" will not be dumped. At line 1296, although we have reached at the end of the 'pvtime' block, since it is not aligned to the page_size (e.g., 0x10000), it will not break at line 1298. 1255 static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, 1256 uint8_t **bufptr, DumpState *s) ... ... 1294 memcpy(buf + addr % page_size, hbuf, n); 1295 addr += n; 1296 if (addr % page_size == 0) { 1297 /* we filled up the page */ 1298 break; 1299 } As a result, get_next_page() will continue to the next block ("mach-virt.ram"). Finally, when get_next_page() returns to the caller: - 'pfnptr' is referring to the 'pvtime' - but 'blockptr' is referring to the "mach-virt.ram" When get_next_page() is called the next time, "*pfnptr += 1" still refers to the prior 'pvtime'. It will exit immediately because it is out of the range of the current "mach-virt.ram". The fix is to break when it is time to come to the next block, so that both 'pfnptr' and 'blockptr' refer to the same block. Fixes: 94d788408d2d ("dump: fix kdump to work over non-aligned blocks") Cc: Joe Jin Signed-off-by: Dongli Zhang Reviewed-by: Marc-André Lureau Message-ID: <20230713055819.30497-1-dongli.zhang@oracle.com> (cherry picked from commit 8a64609eea8cb2bac015968c4b62da5bce266e22) Signed-off-by: Michael Tokarev diff --git a/dump/dump.c b/dump/dump.c index df117c847f..0f3b6a58d5 100644 --- a/dump/dump.c +++ b/dump/dump.c @@ -1298,8 +1298,8 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, memcpy(buf + addr % page_size, hbuf, n); addr += n; - if (addr % page_size == 0) { - /* we filled up the page */ + if (addr % page_size == 0 || addr >= block->target_end) { + /* we filled up the page or the current block is finished */ break; } } else {