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[Xen-devel] [PATCH v10 3/3] vt-d: fix vt-d Device-TLB flush timeout issue



If Device-TLB flush timed out, we hide the target ATS device
immediately and crash the domain owning this ATS device. If
impacted domain is hardware domain, just throw out a warning.

By hiding the device, we make sure it can't be assigned to any
domain any longer (see device_assigned).

Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
---
 xen/drivers/passthrough/pci.c         |  6 +--
 xen/drivers/passthrough/vtd/extern.h  |  5 ++-
 xen/drivers/passthrough/vtd/qinval.c  | 71 ++++++++++++++++++++++++++++++++---
 xen/drivers/passthrough/vtd/x86/ats.c | 11 +++---
 xen/include/xen/pci.h                 |  1 +
 5 files changed, 79 insertions(+), 15 deletions(-)

diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index 9f1716a..9a214c6 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -420,7 +420,7 @@ static void free_pdev(struct pci_seg *pseg, struct pci_dev 
*pdev)
     xfree(pdev);
 }
 
-static void _pci_hide_device(struct pci_dev *pdev)
+void pci_hide_existing_device(struct pci_dev *pdev)
 {
     if ( pdev->domain )
         return;
@@ -437,7 +437,7 @@ int __init pci_hide_device(int bus, int devfn)
     pdev = alloc_pdev(get_pseg(0), bus, devfn);
     if ( pdev )
     {
-        _pci_hide_device(pdev);
+        pci_hide_existing_device(pdev);
         rc = 0;
     }
     pcidevs_unlock();
@@ -467,7 +467,7 @@ int __init pci_ro_device(int seg, int bus, int devfn)
     }
 
     __set_bit(PCI_BDF2(bus, devfn), pseg->ro_map);
-    _pci_hide_device(pdev);
+    pci_hide_existing_device(pdev);
 
     return 0;
 }
diff --git a/xen/drivers/passthrough/vtd/extern.h 
b/xen/drivers/passthrough/vtd/extern.h
index ab7ecad..b54a15c 100644
--- a/xen/drivers/passthrough/vtd/extern.h
+++ b/xen/drivers/passthrough/vtd/extern.h
@@ -60,8 +60,9 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
                          u64 addr, unsigned int size_order, u64 type);
 
 int __must_check qinval_device_iotlb_sync(struct iommu *iommu,
-                                          u32 max_invs_pend,
-                                          u16 sid, u16 size, u64 addr);
+                                          u32 max_invs_pend, u16 did,
+                                          u16 seg, u8 bus, u8 devfn,
+                                          u16 size, u64 addr);
 
 unsigned int get_cache_line_size(void);
 void cacheline_flush(char *);
diff --git a/xen/drivers/passthrough/vtd/qinval.c 
b/xen/drivers/passthrough/vtd/qinval.c
index 69cc6bf..c795e6b 100644
--- a/xen/drivers/passthrough/vtd/qinval.c
+++ b/xen/drivers/passthrough/vtd/qinval.c
@@ -206,10 +206,71 @@ static int invalidate_sync(struct iommu *iommu)
     return 0;
 }
 
+static void dev_invalidate_iotlb_timeout(struct iommu *iommu, u16 did,
+                                         u16 seg, u8 bus, u8 devfn)
+{
+    struct domain *d = NULL;
+    struct pci_dev *pdev;
+
+    if ( test_bit(did, iommu->domid_bitmap) )
+        d = rcu_lock_domain_by_id(iommu->domid_map[did]);
+
+    /*
+     * In case the domain has been freed or the IOMMU domid bitmap is
+     * not valid, the device no longer belongs to this domain.
+     */
+    if ( d == NULL )
+        return;
+
+    pcidevs_lock();
+
+    for_each_pdev(d, pdev)
+    {
+        if ( (pdev->seg == seg) &&
+             (pdev->bus == bus) &&
+             (pdev->devfn == devfn) )
+        {
+            ASSERT(pdev->domain);
+            list_del(&pdev->domain_list);
+            pdev->domain = NULL;
+            pci_hide_existing_device(pdev);
+            break;
+        }
+    }
+
+    pcidevs_unlock();
+
+    if ( !is_hardware_domain(d) )
+        domain_crash(d);
+    else
+        printk(XENLOG_WARNING VTDPREFIX
+               " dom%d: ATS device %04x:%02x:%02x.%u flush failed.\n",
+               d->domain_id,
+               seg, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+    rcu_unlock_domain(d);
+}
+
+int dev_invalidate_sync(struct iommu *iommu, u16 did,
+                        u16 seg, u8 bus, u8 devfn)
+{
+    struct qi_ctrl *qi_ctrl = iommu_qi_ctrl(iommu);
+    int rc = 0;
+
+    if ( qi_ctrl->qinval_maddr )
+    {
+        rc = queue_invalidate_wait(iommu, 0, 1, 1);
+        if ( rc == -ETIMEDOUT )
+            dev_invalidate_iotlb_timeout(iommu, did, seg, bus, devfn);
+    }
+
+    return rc;
+}
+
 int __must_check qinval_device_iotlb_sync(struct iommu *iommu,
-                                          u32 max_invs_pend,
-                                          u16 sid, u16 size,
-                                          u64 addr)
+                                          u32 max_invs_pend, u16 did,
+                                          u16 seg, u8 bus, u8 devfn,
+                                          u16 size, u64 addr)
 {
     unsigned long flags;
     unsigned int index;
@@ -227,7 +288,7 @@ int __must_check qinval_device_iotlb_sync(struct iommu 
*iommu,
     qinval_entry->q.dev_iotlb_inv_dsc.lo.res_1 = 0;
     qinval_entry->q.dev_iotlb_inv_dsc.lo.max_invs_pend = max_invs_pend;
     qinval_entry->q.dev_iotlb_inv_dsc.lo.res_2 = 0;
-    qinval_entry->q.dev_iotlb_inv_dsc.lo.sid = sid;
+    qinval_entry->q.dev_iotlb_inv_dsc.lo.sid = PCI_BDF2(bus, devfn);
     qinval_entry->q.dev_iotlb_inv_dsc.lo.res_3 = 0;
 
     qinval_entry->q.dev_iotlb_inv_dsc.hi.size = size;
@@ -238,7 +299,7 @@ int __must_check qinval_device_iotlb_sync(struct iommu 
*iommu,
     qinval_update_qtail(iommu, index);
     spin_unlock_irqrestore(&iommu->register_lock, flags);
 
-    return invalidate_sync(iommu);
+    return dev_invalidate_sync(iommu, did, seg, bus, devfn);
 }
 
 static int __must_check queue_invalidate_iec_sync(struct iommu *iommu,
diff --git a/xen/drivers/passthrough/vtd/x86/ats.c 
b/xen/drivers/passthrough/vtd/x86/ats.c
index dfa4d30..50190f2 100644
--- a/xen/drivers/passthrough/vtd/x86/ats.c
+++ b/xen/drivers/passthrough/vtd/x86/ats.c
@@ -116,7 +116,6 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
 
     list_for_each_entry( pdev, &ats_devices, list )
     {
-        u16 sid = PCI_BDF2(pdev->bus, pdev->devfn);
         bool_t sbit;
         int rc = 0;
 
@@ -134,8 +133,9 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
             /* invalidate all translations: sbit=1,bit_63=0,bit[62:12]=1 */
             sbit = 1;
             addr = (~0UL << PAGE_SHIFT_4K) & 0x7FFFFFFFFFFFFFFF;
-            rc = qinval_device_iotlb_sync(iommu, pdev->ats_queue_depth,
-                                          sid, sbit, addr);
+            rc = qinval_device_iotlb_sync(iommu, pdev->ats_queue_depth, did,
+                                          pdev->seg, pdev->bus, pdev->devfn,
+                                          sbit, addr);
             break;
         case DMA_TLB_PSI_FLUSH:
             if ( !device_in_domain(iommu, pdev, did) )
@@ -154,8 +154,9 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
                 addr |= (((u64)1 << (size_order - 1)) - 1) << PAGE_SHIFT_4K;
             }
 
-            rc = qinval_device_iotlb_sync(iommu, pdev->ats_queue_depth,
-                                          sid, sbit, addr);
+            rc = qinval_device_iotlb_sync(iommu, pdev->ats_queue_depth, did,
+                                          pdev->seg, pdev->bus, pdev->devfn,
+                                          sbit, addr);
             break;
         default:
             dprintk(XENLOG_WARNING VTDPREFIX, "invalid vt-d flush type\n");
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 6ed29dd..e4940cd 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -118,6 +118,7 @@ int pci_add_device(u16 seg, u8 bus, u8 devfn,
 int pci_remove_device(u16 seg, u8 bus, u8 devfn);
 int pci_ro_device(int seg, int bus, int devfn);
 int pci_hide_device(int bus, int devfn);
+void pci_hide_existing_device(struct pci_dev *pdev);
 struct pci_dev *pci_get_pdev(int seg, int bus, int devfn);
 struct pci_dev *pci_get_real_pdev(int seg, int bus, int devfn);
 struct pci_dev *pci_get_pdev_by_domain(
-- 
1.9.1


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