From: Jan Beulich <jbeulich@suse.com>
Date: Fri, 8 Apr 2016 20:33:17 +0000 (+0200)
Subject: x86/vMSI-X: fix qword write covering vector control field
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~1311
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=7d8519f63ab703e519efe1e8a6d8ccd65b8a803b;p=xen.git

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@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c
index 58b16c3bfc..d450a3c6bb 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. */