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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?q?pwUVeuxI21xRho862YtBvLcPM1X8?= =?utf-8?q?O82fSEW9lmqmT1iCiKYkdAJFhW++dXGXzQQ9CjIeieBKD+zEsPqojLAfV1cPdfY4s?= =?utf-8?q?qFgT09LyH0G+lHvdyIbvPFCrjuFRzfpvKs71gRl0tEL51B/gsNSj/gxuPdCYSpMqR?= =?utf-8?q?gaA2nsLtoeyLLmAU5oaNgpLdZSjZ/wdcSa56rNl3nDSCSVEV5ipCfw1J55CisyeGe?= =?utf-8?q?nB9vkzX5Ij4Ih6kXjh5ngpoRyFBEI96ZimV2bwZ4jBa8jm9XN6azL+xYIrAgEDorl?= =?utf-8?q?5UmRoSmt07/IjS7mN4SEjJYd33pyAG7Y4XRhAaBlNnQ97y5flddY+vIOpw6sQbwky?= =?utf-8?q?TLL+dMJW2f35frE6M34Fhn8zWseofe+6OxdOyr9lxnX8Bh4+WpVOYV1VWGelT9z0o?= =?utf-8?q?fEdHAZS8m+w8YuS+YCeO/ftq2P9NtxzrsP7P7/8guMM2NlHexsI3kL7MJ697sZlgh?= =?utf-8?q?gvSYdt5oTVR77b0voxWTT+aFnHxYJRsdh2V/3qZa3zF9W4/b9IiWkgyREOI4P2mKe?= =?utf-8?q?sIaOrbirO6RCUsTOSzIem/H8xOAc4lFBEHL7CT2a7KHKGiE1T5UVcbj0vxmgaMMa2?= =?utf-8?q?5a+Z/GbrD6HDTSFGE3XUPt+EVE/iPs5V766A3gf/cQZ6SGm/j+6vme1071H9Lf9V9?= =?utf-8?q?xRDeCoOQQmO6/Mo7+USeae21R58Vf8DUOdtlteM4YjuMrCXjbhMcr3SxnTuwYWNJ/?= =?utf-8?q?YA8e5ZtHd2j30nnI0U9utffCSLiVmFeMVlueHBqGAR2u/16jpsVQ11Iv8BrM+oYBB?= =?utf-8?q?wabZERS8an5bRjUlm2n/Thp8apppiCmYj0ePEia68vyTqrcfNLTYxe5mg0utEM6Yu?= =?utf-8?q?qkS5rW/ykuYgaUukFxnVa7biLQ/a6L6al1FalI44cd3jJPOiFPL5LDXQ5Z+yYogfc?= =?utf-8?q?NjLXQuQuZhEe28bJU2COtTBxBvcVcuq1Q7310h8g5dMCqBNOk444Tvp1UZY9NhJbq?= =?utf-8?q?V32HbFRmkqxT5qBw/lfZfKFzA8lDfPgHQjmx8NUygvvORjXYh9kmJQ9fJ6KC/o2mN?= =?utf-8?q?bk2BPVPB6kchhj3QqwsjMBrZDF0uBv2eIoswdT5QiF0k53t9t3xVDaFbkXHUNQj9W?= =?utf-8?q?b8DW6rw592My/BKHc3iPc9bqJLnn+SfPKwvdf6nESPkgPVlorPftF8hnEPL/K1Mtx?= =?utf-8?q?RePxeZYDTyqt99RpO+4IDYGbse/WK2CqFNfzVnCg0cY0AXqwED1kLOPXPqDwaKbXJ?= =?utf-8?q?AlRMNm6MUoaYO9WerrzasIFucMOJUzauk7+KJw/aoStih0CFR0npETo5qnDc30dBz?= =?utf-8?q?RAUEpesQB9WEq+ogl6/aR8B2cVcpVQMLSOci6DBrWeN4i5N0ZXePtSg4C0bYQyfS3?= =?utf-8?q?c996d3qLEnKxqHmlcM0Dcn1BrxVPxK1srVVo5F7WE4tnxwnT9UTCSHepyTJnYly5m?= =?utf-8?q?QWeUmgJYnjO3OLVmptdwcYlY8VcApfvpaSl5xgG7sm2I7/19q3fRkC4hw9GUurXz5?= =?utf-8?q?WfMOR0AEMA91I+njB+skpKQ+1PZUoFchh9rynEm+4RJTixrApQcfrZsZy1zLZkZZy?= =?utf-8?q?AcyDBf2TIm9LfBlpbvnhwwt9xmkkMYUsktixdKHK9Y6hAWSh8voM1G8=3D?= X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: 76fa2955-1683-4df7-8fef-08d9d4561efc X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5600.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2022 16:27:40.2619 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: niSfhnqbCFklJOUP9DIxn+G055ylzYnAqBQm5Su01XOvqnDsEvxx1cfD4tj2qj7WIQ1pOw2Uc9j4+PwzeNuzAA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0402MB3392 Introduce a helper function to determine the largest possible mapping that allows covering a request (or the next part of it that is left to be processed). In order to not add yet more recurring dfn_add() / mfn_add() to the two callers of the new helper, also introduce local variables holding the values presently operated on. Signed-off-by: Jan Beulich --- v3: Re-base over new earlier patch. --- a/xen/drivers/passthrough/iommu.c +++ b/xen/drivers/passthrough/iommu.c @@ -260,12 +260,38 @@ void iommu_domain_destroy(struct domain arch_iommu_domain_destroy(d); } -int iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn, +static unsigned int mapping_order(const struct domain_iommu *hd, + dfn_t dfn, mfn_t mfn, unsigned long nr) +{ + unsigned long res = dfn_x(dfn) | mfn_x(mfn); + unsigned long sizes = hd->platform_ops->page_sizes; + unsigned int bit = find_first_set_bit(sizes), order = 0; + + ASSERT(bit == PAGE_SHIFT); + + while ( (sizes = (sizes >> bit) & ~1) ) + { + unsigned long mask; + + bit = find_first_set_bit(sizes); + mask = (1UL << bit) - 1; + if ( nr <= mask || (res & mask) ) + break; + order += bit; + nr >>= bit; + res >>= bit; + } + + return order; +} + +int iommu_map(struct domain *d, dfn_t dfn0, mfn_t mfn0, unsigned long page_count, unsigned int flags, unsigned int *flush_flags) { const struct domain_iommu *hd = dom_iommu(d); unsigned long i; + unsigned int order; int rc = 0; if ( !is_iommu_enabled(d) ) @@ -273,10 +299,15 @@ int iommu_map(struct domain *d, dfn_t df ASSERT(!IOMMUF_order(flags)); - for ( i = 0; i < page_count; i++ ) + for ( i = 0; i < page_count; i += 1UL << order ) { - rc = iommu_call(hd->platform_ops, map_page, d, dfn_add(dfn, i), - mfn_add(mfn, i), flags, flush_flags); + dfn_t dfn = dfn_add(dfn0, i); + mfn_t mfn = mfn_add(mfn0, i); + + order = mapping_order(hd, dfn, mfn, page_count - i); + + rc = iommu_call(hd->platform_ops, map_page, d, dfn, mfn, + flags | IOMMUF_order(order), flush_flags); if ( likely(!rc) ) continue; @@ -284,11 +315,10 @@ int iommu_map(struct domain *d, dfn_t df if ( !d->is_shutting_down && printk_ratelimit() ) printk(XENLOG_ERR "d%d: IOMMU mapping dfn %"PRI_dfn" to mfn %"PRI_mfn" failed: %d\n", - d->domain_id, dfn_x(dfn_add(dfn, i)), - mfn_x(mfn_add(mfn, i)), rc); + d->domain_id, dfn_x(dfn), mfn_x(mfn), rc); /* while statement to satisfy __must_check */ - while ( iommu_unmap(d, dfn, i, flush_flags) ) + while ( iommu_unmap(d, dfn0, i, flush_flags) ) break; if ( !is_hardware_domain(d) ) @@ -320,20 +350,25 @@ int iommu_legacy_map(struct domain *d, d return rc; } -int iommu_unmap(struct domain *d, dfn_t dfn, unsigned long page_count, +int iommu_unmap(struct domain *d, dfn_t dfn0, unsigned long page_count, unsigned int *flush_flags) { const struct domain_iommu *hd = dom_iommu(d); unsigned long i; + unsigned int order; int rc = 0; if ( !is_iommu_enabled(d) ) return 0; - for ( i = 0; i < page_count; i++ ) + for ( i = 0; i < page_count; i += 1UL << order ) { - int err = iommu_call(hd->platform_ops, unmap_page, d, dfn_add(dfn, i), - 0, flush_flags); + dfn_t dfn = dfn_add(dfn0, i); + int err; + + order = mapping_order(hd, dfn, _mfn(0), page_count - i); + err = iommu_call(hd->platform_ops, unmap_page, d, dfn, + order, flush_flags); if ( likely(!err) ) continue; @@ -341,7 +376,7 @@ int iommu_unmap(struct domain *d, dfn_t if ( !d->is_shutting_down && printk_ratelimit() ) printk(XENLOG_ERR "d%d: IOMMU unmapping dfn %"PRI_dfn" failed: %d\n", - d->domain_id, dfn_x(dfn_add(dfn, i)), err); + d->domain_id, dfn_x(dfn), err); if ( !rc ) rc = err;