RE: [Xen-ia64-devel] Xen/IPF Unstable CS#18694, Linux#706, ioemu#b4d410a1.. Status --- 1 new

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

Isaku Yamahata wrote:
> On Wed, Oct 29, 2008 at 04:10:50PM +0800, Zhang, Jingke wrote:
>> Hi all,
>>     There is one new regression in Cset#18691. With latest
>> Cset#18694, all the case can pass! 
>> 
>>     One regression between Cset#18688 and Cset#18691:    
>> ============== 
>>     1. Qemu graphic mode display abnormally while booting
>>         VTI_Windows and Linux-Xwin. This issue existed in either
>> sdl=1 or vnc=1 mode. And this issue does not exist with Cset#18688. 
> 
> Hmm, I suspect the change set 18689:7ad8c47f5c4b. But I'm not sure.
Hi, Isaku
        We found the cause,maybe rootcause.  18669 may has a poetentail issue, 
but doesn't lead to the issue.  We found valid_mfn() doesn't work in its way, 
and seems it is buggy.  I have no enough time to debug it, but the following 
patch should fix the current issue. 

diff -r a6b1be5a83de xen/arch/ia64/vmx/vtlb.c
--- a/xen/arch/ia64/vmx/vtlb.c  Wed Oct 29 11:02:23 2008 +0900
+++ b/xen/arch/ia64/vmx/vtlb.c  Thu Oct 30 13:47:08 2008 +0800
@@ -522,7 +522,7 @@
      * which is required by vga acceleration since qemu maps shared
      * vram buffer with WB.
      */
-    if (mfn_valid(maddr >> PAGE_SHIFT) && phy_pte.ma == VA_MATTR_NATPAGE)
+    if (!(maddr >> 61) && phy_pte.ma == VA_MATTR_NATPAGE)
         phy_pte.ma = VA_MATTR_WB;

     maddr = ((maddr & _PAGE_PPN_MASK) & PAGE_MASK) | (paddr & ~PAGE_MASK);

Xiantao
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