> + Is the file always available (including old XEN versions)? This file (/sys/hypervisor/properties/features) has been available since Linux 2.6.31 (drivers/xen/sys-hypervisor.c) > + There is also path_read_u64() to avoid path_fopen() & fscanf(). I will change to path_read_u64. I also made a new flow to detect the Xen virtualization type according to the features on this path to maximize the number of versions of existing Xen and Linux to support. Xen versions from Xen 3.3.0 to the current Xen unstable would be able to help detect PV based on XENFEAT_mmu_pt_update_preserve_ad. Xen versions from Xen 4.4.0 to the newest would be able to help detect PVH (which has been introduced since Xen 4.4.0). if cpuid returns XenVMMXenVMM virtype = full if _PATH_SYS_HYP_FEATURES (the file) exists if XENFEAT_mmu_pt_update_preserve_ad is set (supported since Xen 3.3.0) virtype = para else if XENFEAT_supervisor_mode_kernel is set and XENFEAT_hvm_callback_vector is set (supported since Xen 4.4.0) virtype = para end if end if end if Please let me know your feedback and suggestion so that I would send the new patch soon. Dongli Zhang -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
