We have tested the latest xen on VT platform with Intel 915/E8500
chipset. 
Guest OSes are SMP for linux and UP for Windows.
Here is the test summary:
1) Windows Vista can''t boot up normally in PAE SMP Xen and IA32E SMP
xen.
2) IA32E RHEL4u3 guest complains: "warning: many lost ticks..."
3) Qemu window disappears if creating IA32e FC3 HVM with >4G memory
4) Win2003 VMX domain will crash with more than 4G memory.
Details;
IA32:
+ Build&Boot SMP xen0 without problem
+ Can bootup unmodified IA32 SMP 2.6 linux Guest OS in VMX 
+ Can bootup IA32 SMP Guest OS in VMX & XenU with different memory size
  (VMX:64MB,128MB,196MB,256MB,512MB.XenU:256MB)
+ A selected subset of xm-test runs well
+ A selected subset of LTP runs well in IA32 SMP Guest OS in VMX 
+ Can build base kernel 2.6.16 in IA32 SMP Guest OS in VMX
+ Can startX in Dom0
+ Can bootup IA32 SMP 2.6 linux Guest OS in VMX with acpi enable
+ Can startX in IA32 SMP Guest OS in VMX
+ Network is OK in IA32 SMP Guest OS in VMX
+ Can bootup unmodified IA32 UP Windows2000 Guest OS in VMX 
+ Can bootup unmodified IA32 UP ACPI WindowsXP SP2 Guest OS in VMX 
+ Can bootup unmodified IA32 UP ACPI Windows2003 Guest OS in VMX 
PAE:
+ Build&Boot PAE SMP xen0 without problem
+ Can bootup unmodified IA32 nonpae SMP 2.6 linux guest OS in VMX
+ Can bootup unmodified PAE SMP 2.6 linux guest OS in VMX
+ Can bootup PAE SMP 2.6 linux guest OS in VMX & XenU with different
memory size
  (VMX:64MB,128MB,196MB,256MB,512MB,1500MB.XenU:256MB)
+ A selected subset of xm-test runs well
+ A selected subset of LTP runs well in PAE SMP 2.6 linux guest OS in
VMX.
+ Can build base kenerl 2.6.16 in PAE SMP guest OS in VMX.
+ Can startX in Dom0
+ Can bootup PAE SMP 2.6 linux in VMX with acpi enable
+ Can startX in PAE SMP guest OS in VMX
+ Network is OK in PAE SMP guest OS in VMX
+ Can bootup unmodified IA32 UP Windows2000 Guest OS in VMX 
+ Can bootup unmodified IA32 UP ACPI WindowXP SP2 in VMX
+ Can bootup unmodified PAE UP ACPI Windows2003 Guest OS in VMX 
+ Can''t bootup unmodified PAE UP ACPI Windows Vista Guest OS in VMX 
IA32E: 
+ Build&Boot IA32E SMP xen0 without problem
+ Can bootup unmodified IA32 nonpae SMP 2.6 linux guest OS in VMX
+ Can bootup unmodified PAE SMP 2.6 linux guest OS in VMX
+ Can bootup unmodified IA32E SMP 2.6 linux in VMX
+ Can bootup IA32E SMP Guest OS in VMX & xenU with different memory
size.
  (VMX:128MB,256MB,384MB,512MB,1024M,4096MB.XenU:256MB)
+ A selected subset of xm-test runs well
+ A selected subset of LTP runs well in IA32E SMP 2.6 linux Guest OS in
VMX 
+ Can build base kenerl 2.6.16 in IA32E SMP guest OS in VMX.
+ Can startX in Dom0
+ Can bootup IA32E 2.6 linux Guest OS in VMX with acpi enable
+ Can startX in Ia32E SMP guest OS in VMX
+ Network is OK in IA32E SMP Guest OS in VMX
+ Can bootup unmodified IA32 UP ACPI WindowXP SP2 in VMX 
+ Can bootup unmodified PAE UP ACPI Windows 2003 in VMX    
+ Can''t bootup unmodified PAE UP ACPI Windows Vista in VMX    
For details
------------------------------------------------------------
Platform: IA32
Service OS: FC5, IA32, SMP
Hardware: Grandstale
Default guest OS: IA32,SMP, 2.6 kernel
1, one IA32 nonpae SMP VMX domain with memory 512M		PASS
2, one xenU domain with memory 256M				PASS
3, Two IA32 nonpae SMP VMX domains and 2 xenU domains coexist	PASS
4, four IA32 nonpae SMP VMX domains coexist(64M,128M,196M,256M)	PASS
5, network in IA32 nonpae SMP VMX domain			PASS
6, network in XenU domain					PASS
7,subset LTP test in IA32 nonpae SMP VMX domain			PASS
8,one VMX boot with IA32 nonpae SMP base kernel(2.6.16)		PASS
9,xm-test							PASS
10,StartX in Dom0						PASS
11,one IA32 nonpae SMP VMX domain with acpi enable		PASS
12,Build base kernel in IA32 nonpae SMP VMX domain		PASS
13, one IA32 UP Windows 2000 in VMX domain			PASS
14, one IA32 UP ACPI Windows xp sp2 in VMX domain		PASS
15, one IA32 UP ACPI Windows 2003 in VMX domain			PASS
16, 1 IA32 UP 2000 and 1 IA32 UP xpsp2 Windows VMX domains coexist PASS
Xm test on IA32:
==============================Xm-test execution summary:
  PASS:  44
  FAIL:  3
  XPASS: 0
  XFAIL: 3
Details:
XFAIL: 02_network_local_ping_pos 
	 ping loopback failed for size 65507. ping eth0 failed for size
1 48 64 512 1440 1500 1505 4096 4192 32767 65507.
XFAIL: 05_network_dom0_ping_pos 
	 Ping to dom0 failed for size 1 48 64 512 1440 1500 1505 4096
4192 32767 65507.
XFAIL: 11_network_domU_ping_pos 
	 Ping failed for size 1 48 64 512 1440 1500 1505 4096 4192 32767
65507.
LTP test on IA32:
===========================               Summary Test Report of Last Session
==================================================================              
Total     Pass      Fail     NoResult     Crash
==================================================================ltp           
194       194        0          0          0
==================================================================ltp           
194       194        0          0          0
mm                21        21        0          0          0
dio               28        28        0          0          0
nptl              1         1         0          0          0
math              10        10        0          0          0
ipc               8         8         0          0          0
pty               3         3         0          0          0
quickhit         120       120        0          0          0
sched             3         3         0          0          0
==================================================================Total         
194       194        0          0          0
Platform: PAE 
Service OS: RHEL4U1, PAE, SMP
Hardware: Grandstal
Default guest OS: PAE,SMP, 2.6 kernel
 
0, one IA32 nonpae SMP 2.6 VMX domain with memory 256M		PASS
1, one PAE SMP VMX domain with memory 512M			PASS
2, one PAE SMP VMX domain with memory 1500M			PASS
3, one xenU domain with memory 256M				PASS
4, 2 PAE SMP VMX domains and 2 xenU domains coexist		PASS
5, 2 IA32 nonpae SMP VMX domains and 2 PAE SMP VMX domains
coexist(64m,128m,196m,256m)	PASS
6, network in PAE SMP vmx domain				PASS
7, network in xenu domain					PASS
8, subset LTP test in PAE SMP VMX domain			PASS
9, xm-test							PASS
10, one vmx boot with PAE SMP base kernel(2.6.16)		PASS
11, startx in dom0						PASS
12, one PAE SMP vmx domain with acpi enable			PASS
13, build linux 2.6.16 base kernel in PAE SMP vmx domain	PASS	
14, one IA32 UP Windows 2000 in VMX domain			PASS
15, one IA32 UP ACPI Windows xp sp2 in VMX domain		PASS
16, one PAE UP ACPI Windows 2003 in VMX domain			PASS
17, one PAE UP ACPI Windows Vista in VMX domain                	FAIL
18, 1 IA32 UP 2000 and 1 IA32 UP xpsp2 Windows VMX domains coexist PASS
Xm test on PAE:
=======================Xm-test execution summary:
  PASS:  44
  FAIL:  3
  XPASS: 0
  XFAIL: 3
Details:
XFAIL: 02_network_local_ping_pos 
	 ping loopback failed for size 65507. ping eth0 failed for size
1 48 64 512 1440 1500 1505 4096 4192 32767 65507.
XFAIL: 05_network_dom0_ping_pos 
	 Ping to dom0 failed for size 1 48 64 512 1440 1500 1505 4096
4192 32767 65507.
XFAIL: 11_network_domU_ping_pos 
	 Ping failed for size 1 48 64 512 1440 1500 1505 4096 4192 32767
65507.
LTP test on PAE:
===============================               Summary Test Report of Last
Session
==================================================================              
Total     Pass      Fail     NoResult     Crash
==================================================================ltp           
194       194        0          0          0
===================================================================ltp          
194       194        0          0          0
mm                21        21        0          0          0
dio               28        28        0          0          0
nptl              1         1         0          0          0
math              10        10        0          0          0
ipc               8         8         0          0          0
pty               3         3         0          0          0
quickhit         120       120        0          0          0
sched             3         3         0          0          0
===================================================================Total        
194       194        0          0          0
platform: IA32E
service os: rhel4u2, IA32E, SMP
hardware: paxville
default guest os: IA32E,SMP, 2.6 kernel
0, one IA32 nonpae SMP 2.6 VMX domain with memory 256M		PASS
1, one IA32E SMP VMX domain with memory 512M			PASS
2, one xenU domain with memory 256M				PASS
3, 2 IA32E SMP VMX domains and 2 xenU VMX domains coexist	PASS
4, 2 IA32E SMP VMX domains and 2 PAE SMP VMX domains
coexist(64m,128m,196m,256m)	PASS
5, network in IA32E SMP VMX domain				PASS
6, network in XenU domain					PASS
7, one PAE SMP VMX domain with 1500M				PASS
8, subset LTP in IA32E guest OS in VMX				PASS
9, xm-test							PASS
10,one VMX boot with IA32E SMP base kernel(2.6.16)		PASS
11,Build base kernel in IA32E VMX domain			PASS
12,StartX in Dom0						PASS
13,one IA32E SMP VMX domain with acpi enable			PASS
15, one IA32 UP ACPI Windows xp sp2 in VMX domain		PASS
16, one PAE UP ACPI Windows 2003 in VMX domain			PASS
17,one PAE UP ACPI Windows Vista in VMX domain                	FAIL
18, 1 IA32 UP 2003 and 1 IA32 UP xpsp2 Windows VMX domains coexist PASS
Xm test on IA32E:
====================Xm-test execution summary:
  PASS:  44
  FAIL:  3
  XPASS: 0
  XFAIL: 3
Details:
XFAIL: 02_network_local_ping_pos 
	 ping loopback failed for size 65507. ping eth0 failed for size
1 48 64 512 1440 1500 1505 4096 4192 32767 65507.
XFAIL: 05_network_dom0_ping_pos 
	 Ping to dom0 failed for size 1 48 64 512 1440 1500 1505 4096
4192 32767 65507.
XFAIL: 11_network_domU_ping_pos 
	 Ping failed for size 1 48 64 512 1440 1500 1505 4096 4192 32767
65507.
LTP test on IA32E:
========================               Summary Test Report of Last Session
==================================================================              
Total     Pass      Fail     NoResult     Crash
==================================================================ltp           
194       194        0          0          0
==================================================================ltp           
194       194        0          0          0
mm                21        21        0          0          0
dio               28        28        0          0          0
nptl              1         1         0          0          0
math              10        10        0          0          0
ipc               8         8         0          0          0
pty               3         3         0          0          0
quickhit         120       120        0          0          0
sched             3         3         0          0          0
==================================================================Total         
194       194        0          0          0
Bests
Jeff
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