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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?YAqsebLx9kVBgZVP9WUx4cYEFc4GsOn9+cnJzpHPMEV9tmAwmeYj71/7Os5l?= =?us-ascii?Q?zGvRoARcJeZY5NqDbvOJI+5aVI/ggi/jv/ZLyhTGm3iTnaWAcdYIkYEDBwNh?= =?us-ascii?Q?b45B/jxX+AriLzn3hBGOFuVe3IFPfOrIgX3y4J+a54UAODnTM7ewsFY7hflK?= =?us-ascii?Q?tTRAJQOQrxLpbegHdfY9DoTSmXz7milLfLAOGTPPrwH7mNa7fMyZoImqjb+h?= =?us-ascii?Q?KkN7Z0eovKyyX/N6LAg9RaYp5gi7DaQ0UFlXrpjZHccp4GXPdpCvluKUj4RC?= =?us-ascii?Q?xcNoLbn2/6zHKcuCf4VyXrWcknk61bSSF1RORcKgvWUpdWVj7YousXdrP44A?= =?us-ascii?Q?MVoAhovnHERs/agdGkKaI2nln7Ib52eiySHpEwYV8upkHLMaV4IRZyXz5p1c?= =?us-ascii?Q?G9JnEb+N7hnY5rgVxWmAXqfKw0ezHcbauhbWBsxf8vl4pjFE1Jaux1CqI+NM?= =?us-ascii?Q?prXiFEMCrIoc80feB4/VBdCLJeBzRU9X4mAlisHYU5aPi3OaNdQsKlWydlzI?= =?us-ascii?Q?Vto4LnUxPrvtLRQ/XsUyeOqehJVBYpy12VGElV9nyYEE96BIJO8zomSDoayM?= =?us-ascii?Q?eSBGTSUc0a4FK15Er4y2pgjJfGXEhjxXtQkw8dgwIRN/LTf6k3RESX1VL00n?= =?us-ascii?Q?gdx/8PptaSDxVkYolG8uS49lj3zVPOmN1nBGq3KLAipo/rQP+oRLijg0HwK3?= =?us-ascii?Q?xyfYnd/4vrZ3FLo62uNMjHtz/sVrmSScHus+lJ9PdV00UKhaBnakJQQMisfd?= =?us-ascii?Q?jxBZNYnvLv2XcRzpywcj1ufwZnY6phznlutLW59J8ehkmVd+XTIzgAeTJ9Bq?= =?us-ascii?Q?Z6h9+Qe8PvazG4lgVLL0F3cHVl/TAiC/01+EQUztVtiGfov2i+Xu2hK2RAZw?= =?us-ascii?Q?Lyk7d79msAMZW6UBSdvbQ5fkkCYk1RyglgQ38P/g1qfKq4feTRGLQSmJLCoO?= =?us-ascii?Q?p9UzjM6k7NPFalyHRsgKkQbcfkXO5eDwc/xlEbDSjGWee2VhEKtRDyOQvvSo?= =?us-ascii?Q?8sFqoox71N40T80XyUCF9UI1nDHdIG8ZePl0DeUhAWiA5DyuyUryjUNTC2Rk?= =?us-ascii?Q?3EAzO65UK5/pjIin/FOL2yCtqRhSMRZ38gylZiTWL8N64dNqz1+g9JtzUXoy?= =?us-ascii?Q?wc/Wbd+qI7mz/siT2BT72irpFUSzeYgKZPvmcQrBjrY3QkYDOq2HU/ASjN8X?= =?us-ascii?Q?/FJYSQRUHK5DOyG4Ms3VUVnT8qk9cE4tKKcQAKwyPd8pqYfyN1162UKVJoG4?= =?us-ascii?Q?i+NYrblrUyRLgzuCeozhxqzuHjBGiL9tEiT7MySb1tvQzx1d8YwXaN3SXnpi?= =?us-ascii?Q?PFSOLnSb67HU+QIBrmGF9mgOP+yTK+vFIbVQr4mDP4cyQfSzdPSqCyiOqLUo?= =?us-ascii?Q?/IQe4A3KAXsmdVbDGCeoLSU3AJtREyYXJnOgBNHDrKRMnklhvnQApc0/A7Pv?= =?us-ascii?Q?M0D/ZGAwYsh1niNK4Z7JD3dSW3MeTPcrcKBwoCgV56qxZES/PXrqawt7Ok8y?= =?us-ascii?Q?VHN1LM+RuO9IK5tMX6NXA3bzVVEU0edJvSuZZuwl6OYrDaZqzFchojF+Q/8Q?= =?us-ascii?Q?xH9/6n1vyyq3Lg5sg2XsayinTGj81YPjGrWnf6aR?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7cef3af9-0c38-498c-132c-08db2a408c8b X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Mar 2023 19:14:52.9630 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: WVCLEHcTQgTLYmOpWiMVAvO/ciDkMgCSBHTUkoetjylOS6RC2SroJNnFnbvzijDh X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6604 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Nicolin Chen qemu has a need to replace the translations associated with a domain when the guest does large-scale operations like switching between an IDENTITY domain and, say, dma-iommu.c. Currently, it does this by replacing all the mappings in a single domain, but this is very inefficient and means that domains have to be per-device rather than per-translation. Provide a high-level API to allow replacements of one domain with another. This is similar to a detach/attach cycle except it doesn't force the group to go to the blocking domain in-between. By removing this forced blocking domain the iommu driver has the opportunity to implement a non-disruptive replacement of the domain to the greatest extent its hardware allows. This allows the qemu emulation of the vIOMMU to be more complete, as real hardware often has a non-distruptive replacement capability. It could be possible to address this by simply removing the protection from the iommu_attach_group(), but it is not so clear if that is safe for the few users. Thus, add a new API to serve this new purpose. All drivers are already required to support changing between active UNMANAGED domains when using their attach_dev ops. This API is expected to be used only by IOMMUFD, so add to the iommu-priv header and mark it as IOMMUFD_INTERNAL. Suggested-by: Jason Gunthorpe Reviewed-by: Kevin Tian Reviewed-by: Lu Baolu Signed-off-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommu-priv.h | 10 ++++++++++ drivers/iommu/iommu.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) create mode 100644 drivers/iommu/iommu-priv.h diff --git a/drivers/iommu/iommu-priv.h b/drivers/iommu/iommu-priv.h new file mode 100644 index 00000000000000..7c8011bfd15374 --- /dev/null +++ b/drivers/iommu/iommu-priv.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __LINUX_IOMMU_PRIV_H +#define __LINUX_IOMMU_PRIV_H + +#include + +int iommu_group_replace_domain(struct iommu_group *group, + struct iommu_domain *new_domain); + +#endif /* __LINUX_IOMMU_PRIV_H */ diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 76969904b93af4..91a948a76db5ee 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -33,6 +33,7 @@ #include #include "dma-iommu.h" +#include "iommu-priv.h" #include "iommu-sva.h" @@ -2191,6 +2192,35 @@ int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) } EXPORT_SYMBOL_GPL(iommu_attach_group); +/** + * iommu_group_replace_domain - replace the domain that a group is attached to + * @new_domain: new IOMMU domain to replace with + * @group: IOMMU group that will be attached to the new domain + * + * This API allows the group to switch domains without being forced to go to + * the blocking domain in-between. + * + * If the currently attached domain is a core domain (e.g. a default_domain), + * it will act just like the iommu_attach_group(). + */ +int iommu_group_replace_domain(struct iommu_group *group, + struct iommu_domain *new_domain) +{ + int ret; + + if (!new_domain) + return -EINVAL; + + mutex_lock(&group->mutex); + ret = __iommu_group_set_domain(group, new_domain); + if (ret) + __iommu_group_for_each_dev(group, group->domain, + iommu_group_do_attach_device); + mutex_unlock(&group->mutex); + return ret; +} +EXPORT_SYMBOL_NS_GPL(iommu_group_replace_domain, IOMMUFD_INTERNAL); + static int iommu_group_do_set_platform_dma(struct device *dev, void *data) { const struct iommu_ops *ops = dev_iommu_ops(dev); -- 2.40.0