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pr=C Message-ID: <309bdbda-a720-4891-a082-ee749f4c9440@amd.com> Date: Wed, 22 May 2024 15:16:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/7] xen/p2m: put reference for level 2 superpage To: Luca Fancellu , CC: Penny Zheng , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk References: <20240522075151.3373899-1-luca.fancellu@arm.com> <20240522075151.3373899-4-luca.fancellu@arm.com> Content-Language: en-US From: Michal Orzel In-Reply-To: <20240522075151.3373899-4-luca.fancellu@arm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Received-SPF: None (SATLEXMB03.amd.com: michal.orzel@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000971E8:EE_|BL3PR12MB6449:EE_ X-MS-Office365-Filtering-Correlation-Id: d64b647f-d9aa-401a-e767-08dc7a616b90 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|376005|36860700004|1800799015|82310400017; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 May 2024 13:16:41.3123 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d64b647f-d9aa-401a-e767-08dc7a616b90 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000971E8.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6449 Hi Luca, On 22/05/2024 09:51, Luca Fancellu wrote: > > > From: Penny Zheng > > We are doing foreign memory mapping for static shared memory, and > there is a great possibility that it could be super mapped. > But today, p2m_put_l3_page could not handle superpages. > > This commits implements a new function p2m_put_l2_superpage to handle > 2MB superpages, specifically for helping put extra references for > foreign superpages. > > Modify relinquish_p2m_mapping as well to take into account preemption > when type is foreign memory and order is above 9 (2MB). > > Currently 1GB superpages are not handled because Xen is not preemptible > and therefore some work is needed to handle such superpages, for which > at some point Xen might end up freeing memory and therefore for such a > big mapping it could end up in a very long operation. > > Signed-off-by: Penny Zheng > Signed-off-by: Luca Fancellu Reviewed-by: Michal Orzel ~Michal