[Xen-changelog] [xen stable-4.4] VT-d: fix mask applied to DMIBAR in desktop chipset XSA-59 workaround

[patchbot@xxxxxxx]

commit c5a50b46b1c7e2c112cd97854abf8b9e6538bc46
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jun 3 12:10:36 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jun 3 12:10:36 2014 +0200

    VT-d: fix mask applied to DMIBAR in desktop chipset XSA-59 workaround
    
    In commit  ("VT-d: suppress UR signaling for desktop chipsets")
    the mask applied to the value read from DMIBAR is to narrow, only the
    comment accompanying it was correct. Fix that and tag the literal
    number as "long" at once to avoid eventual compiler warnings.
    
    The widest possible value so far is 39 bits; all chipsets covered here
    but having less than this number of bits have the remaining bits marked
    reserved (zero), and hence there's no need for making the mask chipset
    specific.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
    master commit: f8ecf31c31906552522c2a1b0d1cada07d78876e
    master date: 2014-05-26 12:28:46 +0200
---
 xen/drivers/passthrough/vtd/quirks.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/quirks.c 
b/xen/drivers/passthrough/vtd/quirks.c
index d917b2f..33f3942 100644
--- a/xen/drivers/passthrough/vtd/quirks.c
+++ b/xen/drivers/passthrough/vtd/quirks.c
@@ -467,7 +467,7 @@ void pci_vtd_quirk(const struct pci_dev *pdev)
     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 */
+        pa = bar & 0x7ffffff000UL; /* bits 12...38 */
         if ( (bar & 1) && pa &&
              page_is_ram_type(paddr_to_pfn(pa), RAM_TYPE_RESERVED) )
         {
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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