This captures the guest PASID table entry modifications and propagates the changes to host to attach a hwpt with type determined per guest IOMMU PGTT configuration.
When PGTT=PT, attach PASID_0 to a second stage HWPT(GPA->HPA). When PGTT=FST, attach PASID_0 to nested HWPT with nesting parent HWPT coming from VFIO. Co-Authored-by: Yi Liu <[email protected]> Signed-off-by: Yi Liu <[email protected]> Signed-off-by: Yi Sun <[email protected]> Signed-off-by: Zhenzhong Duan <[email protected]> --- hw/i386/intel_iommu_accel.h | 6 ++ include/hw/i386/intel_iommu.h | 1 + hw/i386/intel_iommu.c | 22 ++++++- hw/i386/intel_iommu_accel.c | 114 ++++++++++++++++++++++++++++++++++ hw/i386/trace-events | 3 + 5 files changed, 143 insertions(+), 3 deletions(-) diff --git a/hw/i386/intel_iommu_accel.h b/hw/i386/intel_iommu_accel.h index dbe6ee6982..1a396c50a0 100644 --- a/hw/i386/intel_iommu_accel.h +++ b/hw/i386/intel_iommu_accel.h @@ -16,6 +16,7 @@ bool vtd_check_hiod_accel(IntelIOMMUState *s, VTDHostIOMMUDevice *vtd_hiod, Error **errp); VTDHostIOMMUDevice *vtd_find_hiod_iommufd(VTDAddressSpace *as); +bool vtd_bind_guest_pasid(VTDAddressSpace *vtd_as, Error **errp); #else static inline bool vtd_check_hiod_accel(IntelIOMMUState *s, VTDHostIOMMUDevice *vtd_hiod, @@ -30,5 +31,10 @@ static inline VTDHostIOMMUDevice *vtd_find_hiod_iommufd(VTDAddressSpace *as) { return NULL; } + +static inline bool vtd_bind_guest_pasid(VTDAddressSpace *vtd_as, Error **errp) +{ + return true; +} #endif #endif diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h index 401322665a..8ce8fe1b75 100644 --- a/include/hw/i386/intel_iommu.h +++ b/include/hw/i386/intel_iommu.h @@ -104,6 +104,7 @@ struct VTDAddressSpace { PCIBus *bus; uint8_t devfn; uint32_t pasid; + uint32_t fs_hwpt; AddressSpace as; IOMMUMemoryRegion iommu; MemoryRegion root; /* The root container of the device */ diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 513b2c85d4..36449bf161 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -88,7 +88,11 @@ static void vtd_pasid_cache_reset_locked(IntelIOMMUState *s) g_hash_table_iter_init(&as_it, s->vtd_address_spaces); while (g_hash_table_iter_next(&as_it, NULL, (void **)&vtd_as)) { VTDPASIDCacheEntry *pc_entry = &vtd_as->pasid_cache_entry; - pc_entry->valid = false; + if (pc_entry->valid) { + pc_entry->valid = false; + /* It's fatal to get failure during reset */ + vtd_bind_guest_pasid(vtd_as, &error_fatal); + } } } @@ -3074,6 +3078,8 @@ static void vtd_pasid_cache_sync_locked(gpointer key, gpointer value, VTDPASIDEntry pe; IOMMUNotifier *n; uint16_t did; + const char *err_prefix = "Attaching to HWPT failed: "; + Error *local_err = NULL; if (vtd_dev_get_pe_from_pasid(vtd_as, &pe)) { if (!pc_entry->valid) { @@ -3094,7 +3100,9 @@ static void vtd_pasid_cache_sync_locked(gpointer key, gpointer value, vtd_address_space_unmap(vtd_as, n); } vtd_switch_address_space(vtd_as); - return; + + err_prefix = "Detaching from HWPT failed: "; + goto do_bind_unbind; } /* @@ -3122,12 +3130,20 @@ static void vtd_pasid_cache_sync_locked(gpointer key, gpointer value, if (!pc_entry->valid) { pc_entry->pasid_entry = pe; pc_entry->valid = true; - } else if (!vtd_pasid_entry_compare(&pe, &pc_entry->pasid_entry)) { + } else if (vtd_pasid_entry_compare(&pe, &pc_entry->pasid_entry)) { + err_prefix = "Replacing HWPT attachment failed: "; + } else { return; } vtd_switch_address_space(vtd_as); vtd_address_space_sync(vtd_as); + +do_bind_unbind: + /* TODO: Fault event injection into guest, report error to QEMU for now */ + if (!vtd_bind_guest_pasid(vtd_as, &local_err)) { + error_reportf_err(local_err, "%s", err_prefix); + } } static void vtd_pasid_cache_sync(IntelIOMMUState *s, VTDPASIDCacheInfo *pc_info) diff --git a/hw/i386/intel_iommu_accel.c b/hw/i386/intel_iommu_accel.c index ebfc503d64..66570ea919 100644 --- a/hw/i386/intel_iommu_accel.c +++ b/hw/i386/intel_iommu_accel.c @@ -13,6 +13,7 @@ #include "intel_iommu_internal.h" #include "intel_iommu_accel.h" #include "hw/pci/pci_bus.h" +#include "trace.h" bool vtd_check_hiod_accel(IntelIOMMUState *s, VTDHostIOMMUDevice *vtd_hiod, Error **errp) @@ -68,3 +69,116 @@ VTDHostIOMMUDevice *vtd_find_hiod_iommufd(VTDAddressSpace *as) } return NULL; } + +static bool vtd_create_fs_hwpt(HostIOMMUDeviceIOMMUFD *idev, + VTDPASIDEntry *pe, uint32_t *fs_hwpt, + Error **errp) +{ + struct iommu_hwpt_vtd_s1 vtd = {}; + + vtd.flags = (VTD_SM_PASID_ENTRY_SRE(pe) ? IOMMU_VTD_S1_SRE : 0) | + (VTD_SM_PASID_ENTRY_WPE(pe) ? IOMMU_VTD_S1_WPE : 0) | + (VTD_SM_PASID_ENTRY_EAFE(pe) ? IOMMU_VTD_S1_EAFE : 0); + vtd.addr_width = vtd_pe_get_fs_aw(pe); + vtd.pgtbl_addr = (uint64_t)vtd_pe_get_fspt_base(pe); + + return iommufd_backend_alloc_hwpt(idev->iommufd, idev->devid, idev->hwpt_id, + 0, IOMMU_HWPT_DATA_VTD_S1, sizeof(vtd), + &vtd, fs_hwpt, errp); +} + +static void vtd_destroy_old_fs_hwpt(HostIOMMUDeviceIOMMUFD *idev, + VTDAddressSpace *vtd_as) +{ + if (!vtd_as->fs_hwpt) { + return; + } + iommufd_backend_free_id(idev->iommufd, vtd_as->fs_hwpt); + vtd_as->fs_hwpt = 0; +} + +static bool vtd_device_attach_iommufd(VTDHostIOMMUDevice *vtd_hiod, + VTDAddressSpace *vtd_as, Error **errp) +{ + HostIOMMUDeviceIOMMUFD *idev = HOST_IOMMU_DEVICE_IOMMUFD(vtd_hiod->hiod); + VTDPASIDEntry *pe = &vtd_as->pasid_cache_entry.pasid_entry; + uint32_t hwpt_id; + bool ret; + + /* + * We can get here only if flts=on, the supported PGTT is FST or PT. + * Catch invalid PGTT when processing invalidation request to avoid + * attaching to wrong hwpt. + */ + if (!vtd_pe_pgtt_is_fst(pe) && !vtd_pe_pgtt_is_pt(pe)) { + error_setg(errp, "Invalid PGTT type %d", + (uint8_t)VTD_SM_PASID_ENTRY_PGTT(pe)); + return false; + } + + if (vtd_pe_pgtt_is_pt(pe)) { + hwpt_id = idev->hwpt_id; + } else if (!vtd_create_fs_hwpt(idev, pe, &hwpt_id, errp)) { + return false; + } + + ret = host_iommu_device_iommufd_attach_hwpt(idev, hwpt_id, errp); + trace_vtd_device_attach_hwpt(idev->devid, vtd_as->pasid, hwpt_id, ret); + if (ret) { + /* Destroy old fs_hwpt if it's a replacement */ + vtd_destroy_old_fs_hwpt(idev, vtd_as); + if (vtd_pe_pgtt_is_fst(pe)) { + vtd_as->fs_hwpt = hwpt_id; + } + } else if (vtd_pe_pgtt_is_fst(pe)) { + iommufd_backend_free_id(idev->iommufd, hwpt_id); + } + + return ret; +} + +static bool vtd_device_detach_iommufd(VTDHostIOMMUDevice *vtd_hiod, + VTDAddressSpace *vtd_as, Error **errp) +{ + HostIOMMUDeviceIOMMUFD *idev = HOST_IOMMU_DEVICE_IOMMUFD(vtd_hiod->hiod); + IntelIOMMUState *s = vtd_as->iommu_state; + uint32_t pasid = vtd_as->pasid; + bool ret; + + if (s->dmar_enabled && s->root_scalable) { + ret = host_iommu_device_iommufd_detach_hwpt(idev, errp); + trace_vtd_device_detach_hwpt(idev->devid, pasid, ret); + } else { + /* + * If DMAR remapping is disabled or guest switches to legacy mode, + * we fallback to the default HWPT which contains shadow page table. + * So guest DMA could still work. + */ + ret = host_iommu_device_iommufd_attach_hwpt(idev, idev->hwpt_id, errp); + trace_vtd_device_reattach_def_hwpt(idev->devid, pasid, idev->hwpt_id, + ret); + } + + if (ret) { + vtd_destroy_old_fs_hwpt(idev, vtd_as); + } + + return ret; +} + +bool vtd_bind_guest_pasid(VTDAddressSpace *vtd_as, Error **errp) +{ + VTDPASIDCacheEntry *pc_entry = &vtd_as->pasid_cache_entry; + VTDHostIOMMUDevice *vtd_hiod = vtd_find_hiod_iommufd(vtd_as); + + /* Ignore emulated device or legacy VFIO backed device */ + if (!vtd_as->iommu_state->fsts || !vtd_hiod) { + return true; + } + + if (pc_entry->valid) { + return vtd_device_attach_iommufd(vtd_hiod, vtd_as, errp); + } + + return vtd_device_detach_iommufd(vtd_hiod, vtd_as, errp); +} diff --git a/hw/i386/trace-events b/hw/i386/trace-events index b704f4f90c..5a3ee1cf64 100644 --- a/hw/i386/trace-events +++ b/hw/i386/trace-events @@ -73,6 +73,9 @@ vtd_warn_invalid_qi_tail(uint16_t tail) "tail 0x%"PRIx16 vtd_warn_ir_vector(uint16_t sid, int index, int vec, int target) "sid 0x%"PRIx16" index %d vec %d (should be: %d)" vtd_warn_ir_trigger(uint16_t sid, int index, int trig, int target) "sid 0x%"PRIx16" index %d trigger %d (should be: %d)" vtd_reset_exit(void) "" +vtd_device_attach_hwpt(uint32_t dev_id, uint32_t pasid, uint32_t hwpt_id, int ret) "dev_id %d pasid %d hwpt_id %d, ret: %d" +vtd_device_detach_hwpt(uint32_t dev_id, uint32_t pasid, int ret) "dev_id %d pasid %d ret: %d" +vtd_device_reattach_def_hwpt(uint32_t dev_id, uint32_t pasid, uint32_t hwpt_id, int ret) "dev_id %d pasid %d hwpt_id %d, ret: %d" # amd_iommu.c amdvi_evntlog_fail(uint64_t addr, uint32_t head) "error: fail to write at addr 0x%"PRIx64" + offset 0x%"PRIx32 -- 2.47.1
