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SUSE:SLE-15-SP1:GA
xen.25148
xsa400-06.patch
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File xsa400-06.patch of Package xen.25148
VT-d: prepare for per-device quarantine page tables (part I) Arrange for domain ID and page table root to be passed around, the latter in particular to domain_pgd_maddr() such that taking it from the per-domain fields can be overridden. No functional change intended. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Paul Durrant <paul@xen.org> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> --- a/xen/drivers/passthrough/vtd/extern.h +++ b/xen/drivers/passthrough/vtd/extern.h @@ -71,9 +71,10 @@ void *map_vtd_domain_page(u64 maddr); void unmap_vtd_domain_page(void *va); int domain_context_mapping_one(struct domain *domain, struct iommu *iommu, uint8_t bus, uint8_t devfn, - const struct pci_dev *pdev, unsigned int mode); + const struct pci_dev *pdev, domid_t domid, + paddr_t pgd_maddr, unsigned int mode); int domain_context_unmap_one(struct domain *domain, struct iommu *iommu, - u8 bus, u8 devfn); + uint8_t bus, uint8_t devfn, domid_t domid); int intel_iommu_get_reserved_device_memory(iommu_grdm_t *func, void *ctxt); unsigned int io_apic_read_remap_rte(unsigned int apic, unsigned int reg); @@ -92,7 +93,8 @@ void platform_quirks_init(void); void vtd_ops_preamble_quirk(struct iommu* iommu); void vtd_ops_postamble_quirk(struct iommu* iommu); int __must_check me_wifi_quirk(struct domain *domain, uint8_t bus, - uint8_t devfn, unsigned int mode); + uint8_t devfn, domid_t domid, paddr_t pgd_maddr, + unsigned int mode); void pci_vtd_quirk(const struct pci_dev *); void quirk_iommu_caps(struct iommu *iommu); --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -1399,12 +1399,12 @@ int domain_context_mapping_one( struct domain *domain, struct iommu *iommu, uint8_t bus, uint8_t devfn, const struct pci_dev *pdev, - unsigned int mode) + domid_t domid, paddr_t pgd_maddr, unsigned int mode) { struct domain_iommu *hd = dom_iommu(domain); struct context_entry *context, *context_entries, lctxt; __uint128_t old; - u64 maddr, pgd_maddr; + uint64_t maddr; uint16_t seg = iommu->intel->drhd->segment, prev_did = 0; struct domain *prev_dom = NULL; int agaw, rc, ret; @@ -1445,10 +1445,12 @@ int domain_context_mapping_one( } else { + paddr_t root = pgd_maddr; + spin_lock(&hd->arch.mapping_lock); /* Ensure we have pagetables allocated down to leaf PTE. */ - if ( hd->arch.pgd_maddr == 0 ) + if ( !root ) { addr_to_dma_page_maddr(domain, 0, 1); if ( hd->arch.pgd_maddr == 0 ) @@ -1461,22 +1463,24 @@ int domain_context_mapping_one( rcu_unlock_domain(prev_dom); return -ENOMEM; } + + root = hd->arch.pgd_maddr; } /* Skip top levels of page tables for 2- and 3-level DRHDs. */ - pgd_maddr = hd->arch.pgd_maddr; for ( agaw = level_to_agaw(4); agaw != level_to_agaw(iommu->nr_pt_levels); agaw-- ) { - struct dma_pte *p = map_vtd_domain_page(pgd_maddr); - pgd_maddr = dma_pte_addr(*p); + struct dma_pte *p = map_vtd_domain_page(root); + + root = dma_pte_addr(*p); unmap_vtd_domain_page(p); - if ( pgd_maddr == 0 ) + if ( !root ) goto nomem; } - context_set_address_root(lctxt, pgd_maddr); + context_set_address_root(lctxt, root); if ( ats_enabled && ecap_dev_iotlb(iommu->ecap) ) context_set_translation_type(lctxt, CONTEXT_TT_DEV_IOTLB); else @@ -1592,15 +1596,21 @@ int domain_context_mapping_one( unmap_vtd_domain_page(context_entries); if ( !seg && !rc ) - rc = me_wifi_quirk(domain, bus, devfn, mode); + rc = me_wifi_quirk(domain, bus, devfn, domid, pgd_maddr, mode); if ( rc ) { if ( !prev_dom ) - domain_context_unmap_one(domain, iommu, bus, devfn); + domain_context_unmap_one(domain, iommu, bus, devfn, + domain->domain_id); else if ( prev_dom != domain ) /* Avoid infinite recursion. */ + { + hd = dom_iommu(prev_dom); domain_context_mapping_one(prev_dom, iommu, bus, devfn, pdev, + domain->domain_id, + hd->arch.pgd_maddr, mode & MAP_WITH_RMRR); + } } if ( prev_dom ) @@ -1617,6 +1627,7 @@ static int domain_context_mapping(struct { struct acpi_drhd_unit *drhd; const struct acpi_rmrr_unit *rmrr; + paddr_t pgd_maddr = dom_iommu(domain)->arch.pgd_maddr; int ret = 0; unsigned int i, mode = 0; uint16_t seg = pdev->seg, bdf; @@ -1672,7 +1683,8 @@ static int domain_context_mapping(struct domain->domain_id, seg, bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); ret = domain_context_mapping_one(domain, drhd->iommu, bus, devfn, - pdev, mode); + pdev, domain->domain_id, pgd_maddr, + mode); if ( ret > 0 ) ret = 0; if ( !ret && devfn == pdev->devfn && ats_device(pdev, drhd) > 0 ) @@ -1687,7 +1699,8 @@ static int domain_context_mapping(struct PCI_SLOT(devfn), PCI_FUNC(devfn)); ret = domain_context_mapping_one(domain, drhd->iommu, bus, devfn, - pdev, mode); + pdev, domain->domain_id, pgd_maddr, + mode); if ( ret < 0 ) break; prev_present = ret; @@ -1713,7 +1726,8 @@ static int domain_context_mapping(struct */ if ( ret >= 0 ) ret = domain_context_mapping_one(domain, drhd->iommu, bus, devfn, - NULL, mode); + NULL, domain->domain_id, pgd_maddr, + mode); /* * Devices behind PCIe-to-PCI/PCIx bridge may generate different @@ -1728,7 +1742,8 @@ static int domain_context_mapping(struct if ( !ret && pdev_type(seg, bus, devfn) == DEV_TYPE_PCIe2PCI_BRIDGE && (secbus != pdev->bus || pdev->devfn != 0) ) ret = domain_context_mapping_one(domain, drhd->iommu, secbus, 0, - NULL, mode); + NULL, domain->domain_id, pgd_maddr, + mode); if ( ret ) { @@ -1757,7 +1772,7 @@ static int domain_context_mapping(struct int domain_context_unmap_one( struct domain *domain, struct iommu *iommu, - u8 bus, u8 devfn) + uint8_t bus, uint8_t devfn, domid_t domid) { struct context_entry *context, *context_entries; u64 maddr; @@ -1815,7 +1830,7 @@ int domain_context_unmap_one( unmap_vtd_domain_page(context_entries); if ( !iommu->intel->drhd->segment && !rc ) - rc = me_wifi_quirk(domain, bus, devfn, UNMAP_ME_PHANTOM_FUNC); + rc = me_wifi_quirk(domain, bus, devfn, domid, 0, UNMAP_ME_PHANTOM_FUNC); return rc; } @@ -1854,7 +1869,8 @@ static int domain_context_unmap(struct d printk(VTDPREFIX "d%d:PCIe: unmap %04x:%02x:%02x.%u\n", domain->domain_id, seg, bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); - ret = domain_context_unmap_one(domain, iommu, bus, devfn); + ret = domain_context_unmap_one(domain, iommu, bus, devfn, + domain->domain_id); if ( !ret && devfn == pdev->devfn && ats_device(pdev, drhd) > 0 ) disable_ats_device(pdev); @@ -1864,7 +1880,8 @@ static int domain_context_unmap(struct d if ( iommu_debug ) printk(VTDPREFIX "d%d:PCI: unmap %04x:%02x:%02x.%u\n", domain->domain_id, seg, bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); - ret = domain_context_unmap_one(domain, iommu, bus, devfn); + ret = domain_context_unmap_one(domain, iommu, bus, devfn, + domain->domain_id); if ( ret ) break; @@ -1876,14 +1893,17 @@ static int domain_context_unmap(struct d /* PCIe to PCI/PCIx bridge */ if ( pdev_type(seg, tmp_bus, tmp_devfn) == DEV_TYPE_PCIe2PCI_BRIDGE ) { - ret = domain_context_unmap_one(domain, iommu, tmp_bus, tmp_devfn); + ret = domain_context_unmap_one(domain, iommu, tmp_bus, tmp_devfn, + domain->domain_id); if ( ret ) return ret; - ret = domain_context_unmap_one(domain, iommu, secbus, 0); + ret = domain_context_unmap_one(domain, iommu, secbus, 0, + domain->domain_id); } else /* Legacy PCI bridge */ - ret = domain_context_unmap_one(domain, iommu, tmp_bus, tmp_devfn); + ret = domain_context_unmap_one(domain, iommu, tmp_bus, tmp_devfn, + domain->domain_id); break; --- a/xen/drivers/passthrough/vtd/quirks.c +++ b/xen/drivers/passthrough/vtd/quirks.c @@ -331,6 +331,8 @@ void __init platform_quirks_init(void) static int __must_check map_me_phantom_function(struct domain *domain, unsigned int dev, + domid_t domid, + paddr_t pgd_maddr, unsigned int mode) { struct acpi_drhd_unit *drhd; @@ -344,16 +346,17 @@ static int __must_check map_me_phantom_f /* map or unmap ME phantom function */ if ( !(mode & UNMAP_ME_PHANTOM_FUNC) ) rc = domain_context_mapping_one(domain, drhd->iommu, 0, - PCI_DEVFN(dev, 7), NULL, mode); + PCI_DEVFN(dev, 7), NULL, + domid, pgd_maddr, mode); else rc = domain_context_unmap_one(domain, drhd->iommu, 0, - PCI_DEVFN(dev, 7)); + PCI_DEVFN(dev, 7), domid); return rc; } int me_wifi_quirk(struct domain *domain, uint8_t bus, uint8_t devfn, - unsigned int mode) + domid_t domid, paddr_t pgd_maddr, unsigned int mode) { u32 id; int rc = 0; @@ -377,7 +380,7 @@ int me_wifi_quirk(struct domain *domain, case 0x423b8086: case 0x423c8086: case 0x423d8086: - rc = map_me_phantom_function(domain, 3, mode); + rc = map_me_phantom_function(domain, 3, domid, pgd_maddr, mode); break; default: break; @@ -403,7 +406,7 @@ int me_wifi_quirk(struct domain *domain, case 0x42388086: /* Puma Peak */ case 0x422b8086: case 0x422c8086: - rc = map_me_phantom_function(domain, 22, mode); + rc = map_me_phantom_function(domain, 22, domid, pgd_maddr, mode); break; default: break;
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