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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Jan 2023 13:53:46.6901 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6624ff04-e8f3-49ca-81f9-08daf56d976c X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DBAEUR03FT029.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB5928 Hi Julien, > -----Original Message----- > Subject: [PATCH v4 04/14] xen/arm: flushtlb: Reduce scope of barrier for = the > TLB range flush >=20 > From: Julien Grall >=20 > At the moment, flush_xen_tlb_range_va{,_local}() are using system > wide memory barrier. This is quite expensive and unnecessary. >=20 > For the local version, a non-shareable barrier is sufficient. > For the SMP version, an inner-shareable barrier is sufficient. >=20 > Furthermore, the initial barrier only needs to a store barrier. >=20 > For the full explanation of the sequence see asm/arm{32,64}/flushtlb.h. >=20 > Signed-off-by: Julien Grall > Reviewed-by: Michal Orzel Reviewed-by: Henry Wang Kind regards, Henry