hi,1. domain U Windows is installed from cn_windows_7_ultimate_x64_dvd_x15-66043.iso 2. To be passthroughed Display adapter is HD 6450, detail can be found in lspci.vv, the adapter is secondary adapter for domain 0. 3. From xlexample.hvm, gfx_passthrough is set to 0, so HD 6450 is secondary display adapter for domain U. 4. domain 0 kernel is "Linux localhost.localdomain 3.1.2 #1 SMP Fri Oct 25 19:24:29 EDT 2013 x86_64 x86_64 x86_64 GNU/Linux". 5. On line 68 of xl.dmesg: "(XEN) Interrupt remapping disabled". If interrupt remapping disabled, the passthroughed adapter should not work. right ? I am not sure if this line really reflects the fact. 6. I am trying to verify if cn_windows_7_ultimate_x64_dvd_x15-66043.iso will crash if installed on bare machine with HD6450 with secondary adapter. But ScreenShot.png(attached) is the result after domain U startup. Any comments are appreciated. thankshuiming _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel