[Xen-changelog] [xen stable-4.4] VT-d: suppress UR signaling for desktop chipsets

[patchbot@xxxxxxx]

commit d2f4bcbb105b4a91ffbc1df9d6726dd5876d7840
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon May 12 17:13:32 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon May 12 17:13:32 2014 +0200

    VT-d: suppress UR signaling for desktop chipsets
    
    Unsupported Requests can be signaled for malformed writes to the MSI
    address region, e.g. due to buggy or malicious DMA set up to that
    region. These should normally result in IOMMU faults, but don't on
    the desktop chipsets dealt with here.
    
    This is CVE-2013-3495 / XSA-59.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Don Dugger <donald.d.dugger@xxxxxxxxx>
    Acked-by: Tim Deegan <tim@xxxxxxx>
    Acked-by: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
    master commit: d6cb14b34ffc2a830022d059f1aa22bf19dcf55f
    master date: 2014-04-25 12:12:38 +0200
---
 xen/drivers/passthrough/vtd/quirks.c |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/quirks.c 
b/xen/drivers/passthrough/vtd/quirks.c
index 67a5140..2bbcc21 100644
--- a/xen/drivers/passthrough/vtd/quirks.c
+++ b/xen/drivers/passthrough/vtd/quirks.c
@@ -393,6 +393,8 @@ void __init pci_vtd_quirk(struct pci_dev *pdev)
     int func = PCI_FUNC(pdev->devfn);
     int pos;
     u32 val;
+    u64 bar;
+    paddr_t pa;
 
     if ( pci_conf_read16(seg, bus, dev, func, PCI_VENDOR_ID) !=
          PCI_VENDOR_ID_INTEL )
@@ -454,5 +456,33 @@ void __init pci_vtd_quirk(struct pci_dev *pdev)
         printk(XENLOG_INFO "Masked UR signaling on %04x:%02x:%02x.%u\n",
                seg, bus, dev, func);
         break;
+
+    case 0x100: case 0x104: case 0x108: /* Sandybridge */
+    case 0x150: case 0x154: case 0x158: /* Ivybridge */
+    case 0xa04: /* Haswell ULT */
+    case 0xc00: case 0xc04: case 0xc08: /* Haswell */
+        bar = pci_conf_read32(seg, bus, dev, func, 0x6c);
+        bar = (bar << 32) | pci_conf_read32(seg, bus, dev, func, 0x68);
+        pa = bar & 0x7fffff000; /* bits 12...38 */
+        if ( (bar & 1) && pa &&
+             page_is_ram_type(paddr_to_pfn(pa), RAM_TYPE_RESERVED) )
+        {
+            u32 __iomem *va = ioremap(pa, PAGE_SIZE);
+
+            if ( va )
+            {
+                __set_bit(0x1c8 * 8 + 20, va);
+                iounmap(va);
+                printk(XENLOG_INFO "Masked UR signaling on 
%04x:%02x:%02x.%u\n",
+                       seg, bus, dev, func);
+            }
+            else
+                printk(XENLOG_ERR "Could not map %"PRIpaddr" for 
%04x:%02x:%02x.%u\n",
+                       pa, seg, bus, dev, func);
+        }
+        else
+            printk(XENLOG_WARNING "Bogus DMIBAR %#"PRIx64" on 
%04x:%02x:%02x.%u\n",
+                   bar, seg, bus, dev, func);
+        break;
     }
 }
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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