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Thu, 30 Jul 2020 15:38:01 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 06UFc0rN020352; Thu, 30 Jul 2020 15:38:00 GMT Received: from ca-dev63.us.oracle.com (/10.211.8.221) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 30 Jul 2020 08:37:59 -0700 From: Steve Sistare To: qemu-devel@nongnu.org Subject: [PATCH V1 09/32] savevm: prevent cprsave if memory is volatile Date: Thu, 30 Jul 2020 08:14:13 -0700 Message-Id: <1596122076-341293-10-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1596122076-341293-1-git-send-email-steven.sistare@oracle.com> References: <1596122076-341293-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9698 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxlogscore=999 mlxscore=0 suspectscore=1 bulkscore=0 malwarescore=0 spamscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007300111 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9698 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 clxscore=1015 malwarescore=0 spamscore=0 suspectscore=1 bulkscore=0 priorityscore=1501 phishscore=0 mlxlogscore=999 lowpriorityscore=0 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007300111 Received-SPF: pass client-ip=156.151.31.86; envelope-from=steven.sistare@oracle.com; helo=userp2130.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/30 11:37:58 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -63 X-Spam_score: -6.4 X-Spam_bar: ------ X-Spam_report: (-6.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Daniel P. Berrange" , "Michael S. Tsirkin" , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Juan Quintela , "Dr. David Alan Gilbert" , Markus Armbruster , Alex Williamson , Steve Sistare , Stefan Hajnoczi , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" cprsave and cprload require that guest ram be backed by an externally visible shared file. Check that in cprsave. Signed-off-by: Steve Sistare --- exec.c | 32 ++++++++++++++++++++++++++++++++ include/exec/memory.h | 2 ++ migration/savevm.c | 4 ++++ 3 files changed, 38 insertions(+) diff --git a/exec.c b/exec.c index 6f381f9..02160e0 100644 --- a/exec.c +++ b/exec.c @@ -2726,6 +2726,38 @@ ram_addr_t qemu_ram_addr_from_host(void *ptr) return block->offset + offset; } +/* + * Return true if any memory regions are writable and not backed by shared + * memory. Exclude x86 option rom shadow "pc.rom" by name, even though it is + * writable. + */ +bool qemu_ram_volatile(Error **errp) +{ + RAMBlock *block; + MemoryRegion *mr; + bool ret = false; + + rcu_read_lock(); + QLIST_FOREACH_RCU(block, &ram_list.blocks, next) { + mr = block->mr; + if (mr && + memory_region_is_ram(mr) && + !memory_region_is_ram_device(mr) && + !memory_region_is_rom(mr) && + (!mr->name || strcmp(mr->name, "pc.rom")) && + (block->fd == -1 || !qemu_ram_is_shared(block))) { + + error_setg(errp, "Memory region %s is volatile", + memory_region_name(mr)); + ret = true; + break; + } + } + + rcu_read_unlock(); + return ret; +} + /* Generate a debug exception if a watchpoint has been hit. */ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len, MemTxAttrs attrs, int flags, uintptr_t ra) diff --git a/include/exec/memory.h b/include/exec/memory.h index 307e527..6aafbb0 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2519,6 +2519,8 @@ bool ram_block_discard_is_disabled(void); */ bool ram_block_discard_is_required(void); +bool qemu_ram_volatile(Error **errp); + #endif #endif diff --git a/migration/savevm.c b/migration/savevm.c index 1509173..f101039 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2713,6 +2713,10 @@ void save_cpr_snapshot(const char *file, const char *mode, Error **errp) return; } + if (op == VMS_REBOOT && qemu_ram_volatile(errp)) { + return; + } + f = qf_file_open(file, O_CREAT | O_WRONLY | O_TRUNC, 0600, errp); if (!f) { return; -- 1.8.3.1