On Sat, Mar 19, 2016 at 05:03:41AM -0700, Dongli Zhang wrote:
>
> > + 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.
Looks good, go ahead ;-)
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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