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VT-d: prepare for per-device quarantine page tables (part I)

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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>
This commit is contained in:
Jan Beulich committed 2022-04-05 14:18:26 +02:00
1 parent 1fa6e9aa36
commit eb19326a32
3 files changed
+62 -35
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xen/drivers/passthrough/vtd/extern.h
+5 -3
View File
@@ -82,9 +82,10 @@ void *map_vtd_domain_page(u64 maddr);
void unmap_vtd_domain_page(const void *va);
int domain_context_mapping_one(struct domain *domain, struct vtd_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 vtd_iommu *iommu,
u8 bus, u8 devfn);
uint8_t bus, uint8_t devfn, domid_t domid);
int cf_check intel_iommu_get_reserved_device_memory(
iommu_grdm_t *func, void *ctxt);
@@ -105,7 +106,8 @@ void platform_quirks_init(void);
void vtd_ops_preamble_quirk(struct vtd_iommu *iommu);
void vtd_ops_postamble_quirk(struct vtd_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 vtd_iommu *iommu);
xen/drivers/passthrough/vtd/iommu.c
+49 -27
View File
@@ -43,7 +43,7 @@
#include "../ats.h"
/* dom_io is used as a sentinel for quarantined devices */
#define QUARANTINE_SKIP(d) ((d) == dom_io && !dom_iommu(d)->arch.vtd.pgd_maddr)
#define QUARANTINE_SKIP(d, pgd_maddr) ((d) == dom_io && !(pgd_maddr))
/* Possible unfiltered LAPIC/MSI messages from untrusted sources? */
bool __read_mostly untrusted_msi;
@@ -346,15 +346,17 @@ static u64 addr_to_dma_page_maddr(struct domain *domain, u64 addr, int alloc)
return pte_maddr;
}
static uint64_t domain_pgd_maddr(struct domain *d, unsigned int nr_pt_levels)
static paddr_t domain_pgd_maddr(struct domain *d, paddr_t pgd_maddr,
unsigned int nr_pt_levels)
{
struct domain_iommu *hd = dom_iommu(d);
uint64_t pgd_maddr;
unsigned int agaw;
ASSERT(spin_is_locked(&hd->arch.mapping_lock));
if ( iommu_use_hap_pt(d) )
if ( pgd_maddr )
/* nothing */;
else if ( iommu_use_hap_pt(d) )
{
pagetable_t pgt = p2m_get_pagetable(p2m_get_hostp2m(d));
@@ -1379,18 +1381,18 @@ int domain_context_mapping_one(
struct domain *domain,
struct vtd_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->drhd->segment, prev_did = 0;
struct domain *prev_dom = NULL;
int rc, ret;
bool_t flush_dev_iotlb;
if ( QUARANTINE_SKIP(domain) )
if ( QUARANTINE_SKIP(domain, pgd_maddr) )
return 0;
ASSERT(pcidevs_locked());
@@ -1427,10 +1429,12 @@ int domain_context_mapping_one(
}
else
{
paddr_t root;
spin_lock(&hd->arch.mapping_lock);
pgd_maddr = domain_pgd_maddr(domain, iommu->nr_pt_levels);
if ( !pgd_maddr )
root = domain_pgd_maddr(domain, pgd_maddr, iommu->nr_pt_levels);
if ( !root )
{
spin_unlock(&hd->arch.mapping_lock);
spin_unlock(&iommu->lock);
@@ -1440,7 +1444,7 @@ int domain_context_mapping_one(
return -ENOMEM;
}
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
@@ -1557,15 +1561,21 @@ 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 )
ret = domain_context_unmap_one(domain, iommu, bus, devfn);
ret = domain_context_unmap_one(domain, iommu, bus, devfn,
domain->domain_id);
else if ( prev_dom != domain ) /* Avoid infinite recursion. */
{
hd = dom_iommu(prev_dom);
ret = domain_context_mapping_one(prev_dom, iommu, bus, devfn, pdev,
domain->domain_id,
hd->arch.vtd.pgd_maddr,
mode & MAP_WITH_RMRR) < 0;
}
else
ret = 1;
@@ -1587,6 +1597,7 @@ static int domain_context_mapping(struct domain *domain, u8 devfn,
{
const struct acpi_drhd_unit *drhd = acpi_find_matched_drhd_unit(pdev);
const struct acpi_rmrr_unit *rmrr;
paddr_t pgd_maddr = dom_iommu(domain)->arch.vtd.pgd_maddr;
int ret = 0;
unsigned int i, mode = 0;
uint16_t seg = pdev->seg, bdf;
@@ -1649,7 +1660,8 @@ static int domain_context_mapping(struct domain *domain, u8 devfn,
printk(VTDPREFIX "%pd:PCIe: map %pp\n",
domain, &PCI_SBDF3(seg, bus, 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 )
@@ -1666,7 +1678,8 @@ static int domain_context_mapping(struct domain *domain, u8 devfn,
domain, &PCI_SBDF3(seg, bus, 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;
@@ -1694,7 +1707,8 @@ static int domain_context_mapping(struct domain *domain, u8 devfn,
*/
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
@@ -1709,7 +1723,8 @@ static int domain_context_mapping(struct domain *domain, u8 devfn,
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 )
{
@@ -1737,14 +1752,14 @@ static int domain_context_mapping(struct domain *domain, u8 devfn,
int domain_context_unmap_one(
struct domain *domain,
struct vtd_iommu *iommu,
u8 bus, u8 devfn)
uint8_t bus, uint8_t devfn, domid_t domid)
{
struct context_entry *context, *context_entries;
u64 maddr;
int iommu_domid, rc, ret;
bool_t flush_dev_iotlb;
if ( QUARANTINE_SKIP(domain) )
if ( QUARANTINE_SKIP(domain, dom_iommu(domain)->arch.vtd.pgd_maddr) )
return 0;
ASSERT(pcidevs_locked());
@@ -1798,7 +1813,7 @@ int domain_context_unmap_one(
unmap_vtd_domain_page(context_entries);
if ( !iommu->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);
if ( rc && !is_hardware_domain(domain) && domain != dom_io )
{
@@ -1845,7 +1860,8 @@ static int domain_context_unmap(struct domain *domain, u8 devfn,
if ( iommu_debug )
printk(VTDPREFIX "%pd:PCIe: unmap %pp\n",
domain, &PCI_SBDF3(seg, bus, 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);
@@ -1858,7 +1874,8 @@ static int domain_context_unmap(struct domain *domain, u8 devfn,
if ( iommu_debug )
printk(VTDPREFIX "%pd:PCI: unmap %pp\n",
domain, &PCI_SBDF3(seg, bus, 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;
@@ -1884,12 +1901,15 @@ static int domain_context_unmap(struct domain *domain, u8 devfn,
/* 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 )
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;
@@ -1899,7 +1919,8 @@ static int domain_context_unmap(struct domain *domain, u8 devfn,
return -EINVAL;
}
if ( !ret && !QUARANTINE_SKIP(domain) && pdev->devfn == devfn )
if ( !ret && pdev->devfn == devfn &&
!QUARANTINE_SKIP(domain, dom_iommu(domain)->arch.vtd.pgd_maddr) )
check_cleanup_domid_map(domain, pdev, iommu);
return ret;
@@ -2501,7 +2522,7 @@ static int cf_check reassign_device_ownership(
{
int ret;
if ( !QUARANTINE_SKIP(target) )
if ( !QUARANTINE_SKIP(target, dom_iommu(target)->arch.vtd.pgd_maddr) )
{
if ( !has_arch_pdevs(target) )
vmx_pi_hooks_assign(target);
@@ -2517,7 +2538,8 @@ static int cf_check reassign_device_ownership(
ret = domain_context_mapping(target, devfn, pdev);
if ( !ret && !QUARANTINE_SKIP(source) && pdev->devfn == devfn )
if ( !ret && pdev->devfn == devfn &&
!QUARANTINE_SKIP(source, dom_iommu(source)->arch.vtd.pgd_maddr) )
{
const struct acpi_drhd_unit *drhd = acpi_find_matched_drhd_unit(pdev);
xen/drivers/passthrough/vtd/quirks.c
+8 -5
View File
@@ -408,6 +408,8 @@ 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;
@@ -421,16 +423,17 @@ static int __must_check map_me_phantom_function(struct domain *domain,
/* 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;
@@ -454,7 +457,7 @@ int me_wifi_quirk(struct domain *domain, uint8_t bus, uint8_t devfn,
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;
@@ -480,7 +483,7 @@ int me_wifi_quirk(struct domain *domain, uint8_t bus, uint8_t devfn,
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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