From patchwork Wed Dec 6 17:12:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Sistare X-Patchwork-Id: 13482063 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 CDFF1C10DC1 for ; Wed, 6 Dec 2023 17:14:45 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rAvSY-00071T-GJ; Wed, 06 Dec 2023 12:13:18 -0500 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 1rAvSR-0006xP-Mn for qemu-devel@nongnu.org; Wed, 06 Dec 2023 12:13:11 -0500 Received: from mx0b-00069f02.pphosted.com ([205.220.177.32]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rAvSP-0001U2-Ox for qemu-devel@nongnu.org; Wed, 06 Dec 2023 12:13:11 -0500 Received: from pps.filterd (m0246631.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3B6EY5mw023138; Wed, 6 Dec 2023 17:13:08 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2023-11-20; bh=ZT7aZFi5hiX+6FcwJHLVWgrKIok3nx5ofBwRwPQtJy8=; b=VGWdpdcnGeMbhTl0+OQWk1XGweJpdqr9g+Guyknz/xc1wyPddA3jduVq7BI2p+OgvvCh 1+FJvB83FjNczN9MHWDtwRRkzFzay+K/JdZ1RkGffS4hp7CaotYDdGqHJqJIBUBccE5N IMMyOXcPdGEU1aj95kQbmn9ZvnZY5Oa+WTMVvboRquQTVzSvFtPHkkDtUaS0rBGWwnU7 CePm2ffB8pibJpZO0AeblA0tmdNLPToLo7Sp41BbVYNEd481u3JYAKjHVNbhxRD6KHHw A+H/XfoI/fHqgVXc4F088VobZRJzXehCqMGPpYga1RpCNXG1h20Z2+16zJQLl1i99AJy qA== Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3utdmbj0qk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 06 Dec 2023 17:13:08 +0000 Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 3B6GE0q5032457; Wed, 6 Dec 2023 17:13:07 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 3utan9exah-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 06 Dec 2023 17:13:07 +0000 Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3B6HCrVB024168; Wed, 6 Dec 2023 17:13:06 GMT Received: from ca-dev63.us.oracle.com (ca-dev63.us.oracle.com [10.211.8.221]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 3utan9ewxa-11; Wed, 06 Dec 2023 17:13:06 +0000 From: Steve Sistare To: qemu-devel@nongnu.org Cc: Juan Quintela , Peter Xu , Paolo Bonzini , Thomas Huth , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Fabiano Rosas , Leonardo Bras , Steve Sistare Subject: [PATCH V7 05/12] migration: propagate suspended runstate Date: Wed, 6 Dec 2023 09:12:36 -0800 Message-Id: <1701882772-356078-11-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1701882772-356078-1-git-send-email-steven.sistare@oracle.com> References: <1701882772-356078-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-06_15,2023-12-06_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 suspectscore=0 mlxscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312060140 X-Proofpoint-ORIG-GUID: fbTErSHt_EjhJuoGclkyxdyWUo-9C4qb X-Proofpoint-GUID: fbTErSHt_EjhJuoGclkyxdyWUo-9C4qb Received-SPF: pass client-ip=205.220.177.32; envelope-from=steven.sistare@oracle.com; helo=mx0b-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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 If the outgoing machine was previously suspended, propagate that to the incoming side via global_state, so a subsequent vm_start restores the suspended state. To maintain backward and forward compatibility, reclaim some space from the runstate member. Signed-off-by: Steve Sistare --- migration/global_state.c | 35 +++++++++++++++++++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-) diff --git a/migration/global_state.c b/migration/global_state.c index 4e2a9d8..d4f61a1 100644 --- a/migration/global_state.c +++ b/migration/global_state.c @@ -22,7 +22,16 @@ typedef struct { uint32_t size; - uint8_t runstate[100]; + + /* + * runstate was 100 bytes, zero padded, but we trimmed it to add a + * few fields and maintain backwards compatibility. + */ + uint8_t runstate[32]; + uint8_t has_vm_was_suspended; + uint8_t vm_was_suspended; + uint8_t unused[66]; + RunState state; bool received; } GlobalState; @@ -35,6 +44,10 @@ static void global_state_do_store(RunState state) assert(strlen(state_str) < sizeof(global_state.runstate)); strpadcpy((char *)global_state.runstate, sizeof(global_state.runstate), state_str, '\0'); + global_state.has_vm_was_suspended = true; + global_state.vm_was_suspended = vm_get_suspended(); + + memset(global_state.unused, 0, sizeof(global_state.unused)); } void global_state_store(void) @@ -68,6 +81,12 @@ static bool global_state_needed(void *opaque) return true; } + /* If the suspended state must be remembered, it is needed */ + + if (vm_get_suspended()) { + return true; + } + /* If state is running or paused, it is not needed */ if (strcmp(runstate, "running") == 0 || @@ -85,6 +104,7 @@ static int global_state_post_load(void *opaque, int version_id) Error *local_err = NULL; int r; char *runstate = (char *)s->runstate; + bool vm_was_suspended = s->has_vm_was_suspended && s->vm_was_suspended; s->received = true; trace_migrate_global_state_post_load(runstate); @@ -93,7 +113,7 @@ static int global_state_post_load(void *opaque, int version_id) sizeof(s->runstate)) == sizeof(s->runstate)) { /* * This condition should never happen during migration, because - * all runstate names are shorter than 100 bytes (the size of + * all runstate names are shorter than 32 bytes (the size of * s->runstate). However, a malicious stream could overflow * the qapi_enum_parse() call, so we force the last character * to a NUL byte. @@ -110,6 +130,14 @@ static int global_state_post_load(void *opaque, int version_id) } s->state = r; + /* + * global_state is saved on the outgoing side before forcing a stopped + * state, so it may have saved state=suspended and vm_was_suspended=0. + * Now we are in a paused state, and when we later call vm_start, it must + * restore the suspended state, so we must set vm_was_suspended=1 here. + */ + vm_set_suspended(vm_was_suspended || r == RUN_STATE_SUSPENDED); + return 0; } @@ -134,6 +162,9 @@ static const VMStateDescription vmstate_globalstate = { .fields = (VMStateField[]) { VMSTATE_UINT32(size, GlobalState), VMSTATE_BUFFER(runstate, GlobalState), + VMSTATE_UINT8(has_vm_was_suspended, GlobalState), + VMSTATE_UINT8(vm_was_suspended, GlobalState), + VMSTATE_BUFFER(unused, GlobalState), VMSTATE_END_OF_LIST() }, };