[Xen-changelog] [xen stable-4.6] x86/vMSI-X: fix qword write covering vector control field

[patchbot@xxxxxxx]

commit 440fafe5f4c8473ab5020762f9f71ffdb29921bf
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon May 9 12:53:53 2016 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon May 9 12:53:53 2016 +0200

    x86/vMSI-X: fix qword write covering vector control field
    
    Along with using the upper 32 bits of the written value, the address
    also needs advancing, so that msix_write_completion() will use the
    correct address for re-invocation of msixtbl_write().
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 7d8519f63ab703e519efe1e8a6d8ccd65b8a803b
    master date: 2016-04-08 22:33:17 +0200
---
 xen/arch/x86/hvm/vmsi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c
index ac838a9..4372c50 100644
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -295,6 +295,7 @@ static int msixtbl_write(struct vcpu *v, unsigned long 
address,
         if ( len != 8 || !index )
             goto out;
         val >>= 32;
+        address += 4;
     }
 
     /* Exit to device model when unmasking and address/data got modified. */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.6

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