We have test latest xen on VT platforms with Intel 915/E8500 chipset.
VMX domain has some issues recently, we are resolving these problem. 
IA-32: 
    Build&Boot SMP xen0 without problem ( builder is gcc 3.4.2/Fedora Core
3)
    Can bootup unmodified 2.4/2.6 linux on VMX domain 
    Can NOT bootup unmodified Window XP on VMX domain
    Can bootup VMX & XenU with different configuration
    Part of LTP runs well in VMX domain(2.6)
 
IA-32e: 
    Build&Boot SMP xen0 without problem (builder is gcc 3.4.3/RHEL4u1)
    Can bootup unmodified 2.4/2.6 IA-32 mode linux on VMX domain 
    Can NOT bootup unmodified 2.6 IA-32e mode linux on VMX domain 
    Can  NOT bootup unmodified Window XP on VMX domain
    Can bootup IA-32 mode VMX & xenU with different configuration
    
issues:
    - VMX guest hang in booting up on IA-32 service OS, if XEN was builded in
gcc 3.4.3/RHEL4u1 system.
    - IA-32e mode VMX guest make service OS hang on IA-32e mode service OS.
    - vcpu-pin on VMX guest will hang service OS.
 
For details:
--------------------------------
Platform: IA-32
Default guest OS: IA-32, 2.4 kernel
 
1, one vmx with memory 128        PASS
2, one vmx with memory 256        PASS
3, one vmx with memory 512        PASS
4, one xenU create                PASS
5, 2 vmx and 2 xenU coexist       PASS
6, four vmx coexist               PASS
7, network in VMX domain          PASS
8, network in XenU domain         PASS
9, one window domain              FAIL
10, IDE test in VMX domain        PASS
11,part LTP test in VMX domain    PASS
 
                 Detail Test Report of Last Session
====================================================================The
following testcases do Not pass:
Suite : Scenario      TC No. TP No.
ltp:syscalls           0     221  FAIL              09:17:33
        Starting LTP syscalls Test Case gettimeofday02
               Summary Test Report of Last Session
==============================================================================  
Total     Pass      Fail     NoResult     Crash
==============================================================================ltp
815       814        1          0          0
==============================================================================ltp
815       814        1          0          0
syscalls         687       686        1          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
sched             3         3         0          0          0
fs                54        54        0          0          0
==============================================================================Total
815       814        1          0          0
 
Platform: IA-32e
Default guest OS: IA-32e, 2.6 kernel
 
1, one vmx with memory 128        FAIL
2, one vmx with memory 256        FAIL
3, one vmx with memory 512        FAIL
4, one xenU create                PASS
5, 2 vmx and 2 xenU coexist       FAIL
6, four vmx coexist               FAIL
7, network in VMX domain          FAIL
8, network in XenU domain         PASS
9, one 2.4 IA32 VMX domain        PASS
10, one 2.6 IA32 VMX domain       PASS
11, IA-32 2.4 and 2.6 VMX coexist FAIL
12, IA-32 and IA-32e VMX coexist  FAIL
13,Part LTP test in VMX domain    FAIL
14, one window domain             FAIL
Thanks and best regards
Alex shi
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