/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2011 NetApp, Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include "vmm_util.h" #include "vmm_mem.h" #include "iommu.h" SYSCTL_DECL(_hw_vmm); SYSCTL_NODE(_hw_vmm, OID_AUTO, iommu, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "bhyve iommu parameters"); static int iommu_avail; SYSCTL_INT(_hw_vmm_iommu, OID_AUTO, initialized, CTLFLAG_RD, &iommu_avail, 0, "bhyve iommu initialized?"); static int iommu_enable = 1; SYSCTL_INT(_hw_vmm_iommu, OID_AUTO, enable, CTLFLAG_RDTUN, &iommu_enable, 0, "Enable use of I/O MMU (required for PCI passthrough)."); static const struct iommu_ops *ops; static void *host_domain; static eventhandler_tag add_tag, delete_tag; static __inline int IOMMU_INIT(void) { if (ops != NULL) return ((*ops->init)()); else return (ENXIO); } static __inline void IOMMU_CLEANUP(void) { if (ops != NULL && iommu_avail) (*ops->cleanup)(); } static __inline void * IOMMU_CREATE_DOMAIN(vm_paddr_t maxaddr) { if (ops != NULL && iommu_avail) return ((*ops->create_domain)(maxaddr)); else return (NULL); } static __inline void IOMMU_DESTROY_DOMAIN(void *dom) { if (ops != NULL && iommu_avail) (*ops->destroy_domain)(dom); } static __inline uint64_t IOMMU_CREATE_MAPPING(void *domain, vm_paddr_t gpa, vm_paddr_t hpa, uint64_t len) { if (ops != NULL && iommu_avail) return ((*ops->create_mapping)(domain, gpa, hpa, len)); else return (len); /* XXX */ } static __inline uint64_t IOMMU_REMOVE_MAPPING(void *domain, vm_paddr_t gpa, uint64_t len) { if (ops != NULL && iommu_avail) return ((*ops->remove_mapping)(domain, gpa, len)); else return (len); /* XXX */ } static __inline void IOMMU_ADD_DEVICE(void *domain, uint16_t rid) { if (ops != NULL && iommu_avail) (*ops->add_device)(domain, rid); } static __inline void IOMMU_REMOVE_DEVICE(void *domain, uint16_t rid) { if (ops != NULL && iommu_avail) (*ops->remove_device)(domain, rid); } static __inline void IOMMU_INVALIDATE_TLB(void *domain) { if (ops != NULL && iommu_avail) (*ops->invalidate_tlb)(domain); } static __inline void IOMMU_ENABLE(void) { if (ops != NULL && iommu_avail) (*ops->enable)(); } static __inline void IOMMU_DISABLE(void) { if (ops != NULL && iommu_avail) (*ops->disable)(); } static void iommu_pci_add(void *arg, device_t dev) { /* Add new devices to the host domain. */ iommu_add_device(host_domain, pci_get_rid(dev)); } static void iommu_pci_delete(void *arg, device_t dev) { iommu_remove_device(host_domain, pci_get_rid(dev)); } static void iommu_init(void) { int error, bus, slot, func; vm_paddr_t maxaddr; devclass_t dc; device_t dev; if (!iommu_enable) return; if (vmm_is_intel()) ops = &iommu_ops_intel; else if (vmm_is_svm()) ops = &iommu_ops_amd; else ops = NULL; error = IOMMU_INIT(); if (error) return; iommu_avail = 1; /* * Create a domain for the devices owned by the host */ maxaddr = vmm_mem_maxaddr(); host_domain = IOMMU_CREATE_DOMAIN(maxaddr); if (host_domain == NULL) { printf("iommu_init: unable to create a host domain"); IOMMU_CLEANUP(); ops = NULL; iommu_avail = 0; return; } /* * Create 1:1 mappings from '0' to 'maxaddr' for devices assigned to * the host */ iommu_create_mapping(host_domain, 0, 0, maxaddr); add_tag = EVENTHANDLER_REGISTER(pci_add_device, iommu_pci_add, NULL, 0); delete_tag = EVENTHANDLER_REGISTER(pci_delete_device, iommu_pci_delete, NULL, 0); dc = devclass_find("ppt"); for (bus = 0; bus <= PCI_BUSMAX; bus++) { for (slot = 0; slot <= PCI_SLOTMAX; slot++) { for (func = 0; func <= PCI_FUNCMAX; func++) { dev = pci_find_dbsf(0, bus, slot, func); if (dev == NULL) continue; /* Skip passthrough devices. */ if (dc != NULL && device_get_devclass(dev) == dc) continue; /* * Everything else belongs to the host * domain. */ iommu_add_device(host_domain, pci_get_rid(dev)); } } } IOMMU_ENABLE(); } void iommu_cleanup(void) { if (add_tag != NULL) { EVENTHANDLER_DEREGISTER(pci_add_device, add_tag); add_tag = NULL; } if (delete_tag != NULL) { EVENTHANDLER_DEREGISTER(pci_delete_device, delete_tag); delete_tag = NULL; } IOMMU_DISABLE(); IOMMU_DESTROY_DOMAIN(host_domain); host_domain = NULL; IOMMU_CLEANUP(); } void * iommu_create_domain(vm_paddr_t maxaddr) { static volatile int iommu_initted; if (iommu_initted < 2) { if (atomic_cmpset_int(&iommu_initted, 0, 1)) { iommu_init(); atomic_store_rel_int(&iommu_initted, 2); } else while (iommu_initted == 1) cpu_spinwait(); } return (IOMMU_CREATE_DOMAIN(maxaddr)); } void iommu_destroy_domain(void *dom) { IOMMU_DESTROY_DOMAIN(dom); } void iommu_create_mapping(void *dom, vm_paddr_t gpa, vm_paddr_t hpa, size_t len) { uint64_t mapped, remaining; remaining = len; while (remaining > 0) { mapped = IOMMU_CREATE_MAPPING(dom, gpa, hpa, remaining); gpa += mapped; hpa += mapped; remaining -= mapped; } } void iommu_remove_mapping(void *dom, vm_paddr_t gpa, size_t len) { uint64_t unmapped, remaining; remaining = len; while (remaining > 0) { unmapped = IOMMU_REMOVE_MAPPING(dom, gpa, remaining); gpa += unmapped; remaining -= unmapped; } } void * iommu_host_domain(void) { return (host_domain); } void iommu_add_device(void *dom, uint16_t rid) { IOMMU_ADD_DEVICE(dom, rid); } void iommu_remove_device(void *dom, uint16_t rid) { IOMMU_REMOVE_DEVICE(dom, rid); } void iommu_invalidate_tlb(void *domain) { IOMMU_INVALIDATE_TLB(domain); }