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xen.15297
5d9ee312-AMD-IOMMU-prefill-all-DTEs.patch
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File 5d9ee312-AMD-IOMMU-prefill-all-DTEs.patch of Package xen.15297
# Commit 1b00c16bdfbec98887731a40ea9f377f7dcac405 # Date 2019-10-10 09:51:46 +0200 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> AMD/IOMMU: pre-fill all DTEs right after table allocation Make sure we don't leave any DTEs unexpected requests through which would be passed through untranslated. Set V and IV right away (with all other fields left as zero), relying on the V and/or IV bits getting cleared only by amd_iommu_set_root_page_table() and amd_iommu_set_intremap_table() under special pass-through circumstances. Switch back to initial settings in amd_iommu_disable_domain_device(). Take the liberty and also make the latter function static, constifying its first parameter at the same time, at this occasion. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> # Commit f06d11d5a8339bb5a525069fdffdb45ca811d6f8 # Date 2019-11-15 14:17:26 +0100 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> AMD/IOMMU: restore DTE fields in amd_iommu_setup_domain_device() Commit 1b00c16bdf ("AMD/IOMMU: pre-fill all DTEs right after table allocation") moved ourselves into a more secure default state, but didn't take sufficient care to also undo the effects when handing a previously disabled device back to a(nother) domain. Put the fields that may have been changed elsewhere back to their intended values (some fields amd_iommu_disable_domain_device() touches don't currently get written anywhere else, and hence don't need modifying here). Reported-by: Sander Eikelenboom <linux@eikelenboom.it> Signed-off-by: Jan Beulich <jbeulich@suse.com> Tested-by: Igor Druzhinin <igor.druzhinin@citrix.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> # Commit 195b79a97e6721ba8830036f47d2454545f32e44 # Date 2019-11-27 11:28:24 +0000 # Author Igor Druzhinin <igor.druzhinin@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> AMD/IOMMU: honour IR setting while pre-filling DTEs IV bit shouldn't be set in DTE if interrupt remapping is not enabled. It's a regression in behavior of "iommu=no-intremap" option which otherwise would keep interrupt requests untranslated for all of the devices in the system regardless of wether it's described as valid in IVRS or not. Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> --- a/xen/drivers/passthrough/amd/iommu_init.c +++ b/xen/drivers/passthrough/amd/iommu_init.c @@ -1271,12 +1271,40 @@ static int __init amd_iommu_setup_device if ( !dt ) { + unsigned int size = dt_alloc_size(); + /* allocate 'device table' on a 4K boundary */ dt = IVRS_MAPPINGS_DEVTAB(ivrs_mappings) = - allocate_buffer(dt_alloc_size(), "Device Table", true); + allocate_buffer(size, "Device Table", false); + if ( !dt ) + return -ENOMEM; + + /* + * Prefill every DTE such that all kinds of requests will get aborted. + * Besides the two bits set to true below this builds upon + * IOMMU_DEV_TABLE_SYS_MGT_DMA_ABORTED, + * IOMMU_DEV_TABLE_IO_CONTROL_ABORTED, as well as + * IOMMU_DEV_TABLE_INT_CONTROL_ABORTED all being zero, and us also + * wanting at least TV, GV, I, and EX set to false. + */ + for ( bdf = 0, size /= IOMMU_DEV_TABLE_ENTRY_SIZE; bdf < size; ++bdf ) + { + uint32_t *dte = dt + bdf * IOMMU_DEV_TABLE_ENTRY_SIZE; + + set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, 0, + IOMMU_DEV_TABLE_VALID_MASK, + IOMMU_DEV_TABLE_VALID_SHIFT, &dte[0]); + dte[1] = 0; + dte[2] = 0; + dte[3] = 0; + set_field_in_reg_u32(iommu_intremap, 0, + IOMMU_DEV_TABLE_INT_VALID_MASK, + IOMMU_DEV_TABLE_INT_VALID_SHIFT, &dte[4]); + dte[5] = 0; + dte[6] = 0; + dte[7] = 0; + } } - if ( !dt ) - return -ENOMEM; /* Add device table entries */ for ( bdf = 0; bdf < ivrs_bdf_entries; bdf++ ) --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c @@ -99,11 +99,60 @@ static void disable_translation(u32 *dte { u32 entry; + /* See the comment in amd_iommu_setup_device_table(). */ + entry = dte[5]; + set_field_in_reg_u32(IOMMU_DEV_TABLE_INT_CONTROL_ABORTED, entry, + IOMMU_DEV_TABLE_INT_CONTROL_MASK, + IOMMU_DEV_TABLE_INT_CONTROL_SHIFT, &entry); + dte[5] = entry; + + smp_wmb(); + entry = dte[0]; set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, entry, IOMMU_DEV_TABLE_TRANSLATION_VALID_MASK, IOMMU_DEV_TABLE_TRANSLATION_VALID_SHIFT, &entry); + dte[0] = entry; + + entry = dte[1]; + set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, entry, + IOMMU_DEV_TABLE_GV_MASK, + IOMMU_DEV_TABLE_GV_SHIFT, &entry); + dte[1] = entry; + + iommu_dte_set_iotlb(dte, IOMMU_CONTROL_DISABLED); + + entry = dte[3]; + set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, entry, + IOMMU_DEV_TABLE_SUPRESS_LOGGED_PAGES_MASK, + IOMMU_DEV_TABLE_SUPRESS_LOGGED_PAGES_SHIFT, &entry); + set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, entry, + IOMMU_DEV_TABLE_SUPRESS_ALL_PAGES_MASK, + IOMMU_DEV_TABLE_SUPRESS_ALL_PAGES_SHIFT, &entry); + set_field_in_reg_u32(IOMMU_DEV_TABLE_IO_CONTROL_ABORTED, entry, + IOMMU_DEV_TABLE_IO_CONTROL_MASK, + IOMMU_DEV_TABLE_IO_CONTROL_SHIFT, &entry); + set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, entry, + IOMMU_DEV_TABLE_SNOOP_DISABLE_MASK, + IOMMU_DEV_TABLE_SNOOP_DISABLE_SHIFT, &entry); set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, entry, + IOMMU_DEV_TABLE_ALLOW_EXCLUSION_MASK, + IOMMU_DEV_TABLE_ALLOW_EXCLUSION_SHIFT, &entry); + set_field_in_reg_u32(IOMMU_DEV_TABLE_SYS_MGT_DMA_ABORTED, entry, + IOMMU_DEV_TABLE_SYS_MGT_MSG_ENABLE_MASK, + IOMMU_DEV_TABLE_SYS_MGT_MSG_ENABLE_SHIFT, &entry); + dte[3] = entry; + + entry = dte[4]; + set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, entry, + IOMMU_DEV_TABLE_INT_VALID_MASK, + IOMMU_DEV_TABLE_INT_VALID_SHIFT, &entry); + dte[4] = entry; + + smp_wmb(); + + entry = dte[0]; + set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, entry, IOMMU_DEV_TABLE_VALID_MASK, IOMMU_DEV_TABLE_VALID_SHIFT, &entry); dte[0] = entry; @@ -113,7 +162,7 @@ static void amd_iommu_setup_domain_devic struct domain *domain, struct amd_iommu *iommu, u8 devfn, struct pci_dev *pdev) { - void *dte; + u32 *dte; unsigned long flags; int req_id, valid = 1; int dte_i = 0; @@ -135,16 +184,52 @@ static void amd_iommu_setup_domain_devic spin_lock_irqsave(&iommu->lock, flags); - if ( !is_translation_valid((u32 *)dte) ) + if ( !is_translation_valid(dte) ) { + const struct ivrs_mappings *ivrs_dev; + u32 entry; + /* bind DTE to domain page-tables */ amd_iommu_set_root_page_table( - (u32 *)dte, page_to_maddr(hd->arch.root_table), domain->domain_id, + dte, page_to_maddr(hd->arch.root_table), domain->domain_id, hd->arch.paging_mode, valid); + /* Undo what disable_translation() may have done. */ + + entry = dte[5]; + if ( get_field_from_reg_u32(dte[4], + IOMMU_DEV_TABLE_INT_TABLE_PTR_LOW_MASK, + IOMMU_DEV_TABLE_INT_TABLE_PTR_LOW_SHIFT) | + get_field_from_reg_u32(entry, + IOMMU_DEV_TABLE_INT_TABLE_PTR_HIGH_MASK, + IOMMU_DEV_TABLE_INT_TABLE_PTR_HIGH_SHIFT) ) + { + set_field_in_reg_u32(IOMMU_DEV_TABLE_INT_CONTROL_TRANSLATED, entry, + IOMMU_DEV_TABLE_INT_CONTROL_MASK, + IOMMU_DEV_TABLE_INT_CONTROL_SHIFT, &entry); + dte[5] = entry; + } + + entry = dte[4]; + set_field_in_reg_u32(iommu_intremap, entry, + IOMMU_DEV_TABLE_INT_VALID_MASK, + IOMMU_DEV_TABLE_INT_VALID_SHIFT, &entry); + dte[4] = entry; + + ivrs_dev = &get_ivrs_mappings(iommu->seg)[req_id]; + entry = dte[3]; + set_field_in_reg_u32(ivrs_dev->dte_allow_exclusion, entry, + IOMMU_DEV_TABLE_ALLOW_EXCLUSION_MASK, + IOMMU_DEV_TABLE_ALLOW_EXCLUSION_SHIFT, &entry); + set_field_in_reg_u32(MASK_EXTR(ivrs_dev->device_flags, + ACPI_IVHD_SYSTEM_MGMT), + entry, IOMMU_DEV_TABLE_SYS_MGT_MSG_ENABLE_MASK, + IOMMU_DEV_TABLE_SYS_MGT_MSG_ENABLE_SHIFT, &entry); + dte[3] = entry; + if ( pci_ats_device(iommu->seg, bus, pdev->devfn) && iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) ) - iommu_dte_set_iotlb((u32 *)dte, dte_i); + iommu_dte_set_iotlb(dte, dte_i); amd_iommu_flush_device(iommu, req_id); @@ -287,9 +372,9 @@ static void __hwdom_init amd_iommu_hwdom setup_hwdom_pci_devices(d, amd_iommu_add_device); } -void amd_iommu_disable_domain_device(struct domain *domain, - struct amd_iommu *iommu, - u8 devfn, struct pci_dev *pdev) +static void amd_iommu_disable_domain_device(const struct domain *domain, + struct amd_iommu *iommu, + uint8_t devfn, struct pci_dev *pdev) { void *dte; unsigned long flags; @@ -305,10 +390,6 @@ void amd_iommu_disable_domain_device(str { disable_translation((u32 *)dte); - if ( pci_ats_device(iommu->seg, bus, pdev->devfn) && - iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) ) - iommu_dte_set_iotlb((u32 *)dte, 0); - amd_iommu_flush_device(iommu, req_id); AMD_IOMMU_DEBUG("Disable: device id = %#x, "
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