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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 B2BCEE6B27C for ; Fri, 1 Nov 2024 13:50:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t6s0x-00047i-Cy; Fri, 01 Nov 2024 09:48:35 -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 1t6s0v-00041J-9Q for qemu-devel@nongnu.org; Fri, 01 Nov 2024 09:48:33 -0400 Received: from mx0a-00069f02.pphosted.com ([205.220.165.32]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t6s0t-0002GS-KF for qemu-devel@nongnu.org; Fri, 01 Nov 2024 09:48:33 -0400 Received: from pps.filterd (m0333521.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4A1Dfe4L029184; Fri, 1 Nov 2024 13:48:25 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :date:from:in-reply-to:message-id:references:subject:to; s= corp-2023-11-20; bh=mFMfP6A/2uG91S8VBhFG+/Sw+haZOLY6FbviW3+2dlA=; b= Xkjq477PkrTMqoIGhfTu1iNJuSs1WK9DmXPg3p6brdPJRLtNGpuu5unztgloDxUS ayrAyLYyS7h6ChebNVmYqnsFuJGRqbkxRjqNANvrFkqTFRU8xhBL3Hd6zIc6jxv7 4zA8prOJO0GE1uPxdXjEPJKblPCXk/Jc4LAbqnp07FrOhJrIuImeFYzfkKUf9u3C EteREzTQPEx9De5GYCULsKkhF1twtM4m3P+doXDTPt/kT+akjvFan18LwH2Wt0Z7 r7SS7Kpxsf/8qyXYG4pApYforqoFLB9YfextbNDGG2mPJL5lbCNbfJKprjRQ8U2M 6yMJMFPYccgVsTmg3W5iUA== Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.appoci.oracle.com [138.1.114.2]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 42grdxv9w8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 01 Nov 2024 13:48:25 +0000 (GMT) Received: from pps.filterd (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 4A1Cc7Pq009727; Fri, 1 Nov 2024 13:48:24 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 42hn91pt6s-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 01 Nov 2024 13:48:24 +0000 Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 4A1DhuO6006031; Fri, 1 Nov 2024 13:47:58 GMT Received: from ca-dev63.us.oracle.com (ca-dev63.us.oracle.com [10.211.8.221]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 42hn91pt43-4; Fri, 01 Nov 2024 13:47:58 +0000 From: Steve Sistare To: qemu-devel@nongnu.org Cc: Peter Xu , Fabiano Rosas , David Hildenbrand , Marcel Apfelbaum , Eduardo Habkost , Philippe Mathieu-Daude , Paolo Bonzini , "Daniel P. Berrange" , Markus Armbruster , Steve Sistare Subject: [PATCH V3 03/16] physmem: preserve ram blocks for cpr Date: Fri, 1 Nov 2024 06:47:42 -0700 Message-Id: <1730468875-249970-4-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1730468875-249970-1-git-send-email-steven.sistare@oracle.com> References: <1730468875-249970-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-11-01_08,2024-11-01_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 mlxscore=0 spamscore=0 phishscore=0 suspectscore=0 malwarescore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2411010100 X-Proofpoint-GUID: aLkqzbqR9b80TzF8Loqc2HyedvLR15Hh X-Proofpoint-ORIG-GUID: aLkqzbqR9b80TzF8Loqc2HyedvLR15Hh Received-SPF: pass client-ip=205.220.165.32; envelope-from=steven.sistare@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Save the memfd for anonymous ramblocks in CPR state, along with a name that uniquely identifies it. The block's idstr is not yet set, so it cannot be used for this purpose. Find the saved memfd in new QEMU when creating a block. QEMU hard-codes the length of some internally-created blocks, so to guard against that length changing, use lseek to get the actual length of an incoming memfd. Signed-off-by: Steve Sistare --- system/physmem.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/system/physmem.c b/system/physmem.c index 174f7e0..cd468eb 100644 --- a/system/physmem.c +++ b/system/physmem.c @@ -72,6 +72,7 @@ #include "qapi/qapi-types-migration.h" #include "migration/options.h" +#include "migration/cpr.h" #include "migration/vmstate.h" #include "qemu/range.h" @@ -1663,6 +1664,19 @@ void qemu_ram_unset_idstr(RAMBlock *block) } } +static char *cpr_name(RAMBlock *block) +{ + MemoryRegion *mr = block->mr; + const char *mr_name = memory_region_name(mr); + g_autofree char *id = mr->dev ? qdev_get_dev_path(mr->dev) : NULL; + + if (id) { + return g_strdup_printf("%s/%s", id, mr_name); + } else { + return g_strdup(mr_name); + } +} + size_t qemu_ram_pagesize(RAMBlock *rb) { return rb->page_size; @@ -1858,14 +1872,23 @@ static void ram_block_add(RAMBlock *new_block, Error **errp) TYPE_MEMORY_BACKEND)) { size_t max_length = new_block->max_length; MemoryRegion *mr = new_block->mr; - const char *name = memory_region_name(mr); + g_autofree char *name = cpr_name(new_block); new_block->mr->align = QEMU_VMALLOC_ALIGN; new_block->flags |= RAM_SHARED; + new_block->fd = cpr_find_fd(name, 0); if (new_block->fd == -1) { new_block->fd = qemu_memfd_create(name, max_length + mr->align, 0, 0, 0, errp); + cpr_save_fd(name, 0, new_block->fd); + } else if (lseek(new_block->fd, 0, SEEK_END) < max_length && + ftruncate(new_block->fd, max_length)) { + error_setg_errno(errp, errno, + "cannot grow ram block %s fd %d to %ld bytes", + name, new_block->fd, max_length); + qemu_mutex_unlock_ramlist(); + return; } if (new_block->fd >= 0) { @@ -1875,6 +1898,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp) false, 0, errp); } if (!new_block->host) { + cpr_delete_fd(name, 0); qemu_mutex_unlock_ramlist(); return; } @@ -2182,6 +2206,8 @@ static void reclaim_ramblock(RAMBlock *block) void qemu_ram_free(RAMBlock *block) { + g_autofree char *name = NULL; + if (!block) { return; } @@ -2192,6 +2218,8 @@ void qemu_ram_free(RAMBlock *block) } qemu_mutex_lock_ramlist(); + name = cpr_name(block); + cpr_delete_fd(name, 0); QLIST_REMOVE_RCU(block, next); ram_list.mru_block = NULL; /* Write list before version */ -- 1.8.3.1