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Thu, 13 May 2021 20:21:06 +0000 Subject: Re: [PATCH V3 07/22] cpr To: Stefan Hajnoczi References: <1620390320-301716-1-git-send-email-steven.sistare@oracle.com> <1620390320-301716-8-git-send-email-steven.sistare@oracle.com> From: Steven Sistare Organization: Oracle Corporation Message-ID: <008ac3a4-a187-3e9f-d82d-8279e82805b1@oracle.com> Date: Thu, 13 May 2021 16:21:02 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [24.62.106.7] X-ClientProxiedBy: SN7PR04CA0091.namprd04.prod.outlook.com (2603:10b6:806:122::6) To BYAPR10MB3240.namprd10.prod.outlook.com (2603:10b6:a03:155::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.92] (24.62.106.7) by SN7PR04CA0091.namprd04.prod.outlook.com (2603:10b6:806:122::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4129.25 via Frontend Transport; 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envelope-from=steven.sistare@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Daniel P. Berrange" , "Michael S. Tsirkin" , Jason Zeng , =?UTF-8?Q?Alex_Benn=c3=a9e?= , Juan Quintela , qemu-devel@nongnu.org, "Dr. David Alan Gilbert" , Alex Williamson , =?UTF-8?Q?Marc-Andr=c3=a9_Lureau?= , Paolo Bonzini , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Markus Armbruster Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 5/12/2021 12:19 PM, Stefan Hajnoczi wrote: > On Fri, May 07, 2021 at 05:25:05AM -0700, Steve Sistare wrote: >> To use the restart mode, qemu must be started with the memfd-alloc machine >> option. The memfd's are saved to the environment and kept open across exec, >> after which they are found from the environment and re-mmap'd. Hence guest >> ram is preserved in place, albeit with new virtual addresses in the qemu >> process. The caller resumes the guest by calling cprload, which loads >> state from the file. If the VM was running at cprsave time, then VM >> execution resumes. cprsave supports any type of guest image and block >> device, but the caller must not modify guest block devices between cprsave >> and cprload. > > Does QEMU's existing -object memory-backend-file on tmpfs or hugetlbfs > achieve the same thing? Not quite. Various secondary anonymous memory objects are allocated via ram_block_add and must be preserved, such as these on x86_64. vga.vram pc.ram pc.bios pc.rom vga.rom rom@etc/acpi/tables rom@etc/table-loader rom@etc/acpi/rsdp Even the read-only areas must be preserved rather than recreated from files in the updated qemu, as their contents may have changed. - Steve