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Sat, 22 Aug 2026 13:21:25 -0700 Date: Sat, 22 Aug 2026 13:21:25 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , Subject: Re: [PATCH v9 07/12] iommu/arm-smmu-v3-kexec: Add ASID/VMID reservation helpers Message-ID: References: <9f9d227c0adf472e93293008e7083973688d015e.1784663184.git.nicolinc@nvidia.com> <178735412602.18212.13622444378152698190.b4-review@b4> <20260822195954.GN244917@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260822195954.GN244917@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF00000147:EE_|PH7PR12MB7329:EE_ X-MS-Office365-Filtering-Correlation-Id: 8d5232b3-0f8c-45ef-dbc9-08df008af9de X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|1800799024|82310400026|23010399003|10067099003|4143699003|11063799006|56012099006|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: fGH/DjybdHjiLEcG0NBWO9+cjIZiV3U6NySgYjDcVyteNZIDCDeRj6NX0fMDdJNpAURh11+eJd/INfkOCGGzKy4hPZW9DeDQAksaORKldgS0CVLUbnqL/PSRwpuFmfk5W+FPM/LmB4yE3ED/X7u8+/HYCXU7xEa4Vbr1MIhendlbV82bLvLbgO7SOnJGXTg+2YkNsr3LqxiIlZasLO37s8YktwHkM+QEEkcW1tKB4TPtwJgKJy40aMeulq4Tp/n9GWSBpKrc7WEIGjpSA//uNagka0xrpdaddjnP0D0utrd3V41K0fkpVylHCx7ZtOv/sE6C4R8j8cwKGWKEbwE/EDHfzBnR5keTVV4A7cEh9bx/fBhl4WMl86pUHp6mNvZelr5xE2Pd1TEuFtngxEKo2VdQ2cIepvDhv3k1FI+/mILEo68XOZYxYyST2pyCRYBo X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2026 20:21:40.5793 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8d5232b3-0f8c-45ef-dbc9-08df008af9de X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000147.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7329 On Sat, Aug 22, 2026 at 04:59:54PM -0300, Jason Gunthorpe wrote: > On Sat, Aug 22, 2026 at 11:51:58AM -0700, Nicolin Chen wrote: > > On Fri, Aug 21, 2026 at 08:15:26PM -0300, Jason Gunthorpe wrote: > > > > +/** > > > > + * arm_smmu_kexec_unresv_ids() - Roll back a failing reservation scan > > > > + * @smmu: SMMU device of this kernel that failed its reservation scan > > > > > > And wouldn't need this either. > > > > > > Actually I think this is overkill regardless, just leave the xarray with ASIDs > > > reserved. Who cares? > > > > ASID might be 8-bit that would have limited ASID slots. And it's > > a quite small step, so I think it might be worth keeping it. > > Once you have it per smmu just clear the entire xarray on some > failure Yes, there are only two destroy() in the function now. Nicolin