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Tue, 14 Jan 2025 01:38:17 +0000 Message-ID: Date: Tue, 14 Jan 2025 09:38:09 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6/7] RAMBlock: make guest_memfd require coordinate discard To: David Hildenbrand , Paolo Bonzini , Peter Xu , =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= , Michael Roth CC: , , Williams Dan J , Peng Chao P , Gao Chao , Xu Yilun References: <20241213070852.106092-1-chenyi.qiang@intel.com> <20241213070852.106092-7-chenyi.qiang@intel.com> <3e23b5b0-963c-4ca1-a26b-dd5f247a3a60@redhat.com> From: Chenyi Qiang Content-Language: en-US In-Reply-To: <3e23b5b0-963c-4ca1-a26b-dd5f247a3a60@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SGBP274CA0014.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::26) To DM3PR11MB8735.namprd11.prod.outlook.com (2603:10b6:0:4b::20) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM3PR11MB8735:EE_|DM4PR11MB7397:EE_ X-MS-Office365-Filtering-Correlation-Id: e656b5c0-d372-45e1-9729-08dd343c1e94 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; 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>>           assert(new_block->guest_memfd < 0); >>   -        ret = ram_block_discard_require(true); >> +        ret = ram_block_coordinated_discard_require(true); >>           if (ret < 0) { >>               error_setg_errno(errp, -ret, >>                                "cannot set up private guest memory: >> discard currently blocked"); > > Would that also unlock virtio-mem by accident? Hum, that's true. At present, the rdm in MR can only point to one instance, thus if we unlock virtio-mem and try to use it with guest_memfd, it would trigger assert in memory_region_set_ram_discard_manager(). Maybe we need to add some explicit check in virtio-mem to exclude it with guest_memfd at present? >