[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2] kexec: implement STATUS hypercall to check if image is loaded
>>> On 13.01.17 at 13:49, <daniel.kiper@xxxxxxxxxx> wrote: > On Fri, Jan 13, 2017 at 05:35:35AM -0700, Jan Beulich wrote: >> >>> On 13.01.17 at 13:14, <daniel.kiper@xxxxxxxxxx> wrote: >> > Jan, so, __XEN_LATEST_INTERFACE_VERSION__ is used only for Xen internal >> > purposes >> > (eg. for xl build, etc.) and should not be used as a reference point >> > externally, >> > e.g. in kexec-tools? >> >> It's certainly meant for external consumption (see my original reply >> to Eric), but if at all possible you should not use it for (build time, >> obviously) feature detection. > > So, AIUI, __XEN_LATEST_INTERFACE_VERSION__ should be used when e.g. structure > layout passed to a given hypercall changes and it is not possible to detect > such change in other way. Right? No, structure _layout_ must not change (other than in tools only interfaces). But structure field naming occasionally changes. While that retains binary compatibility, source code requires changes in such a case, and that's what the symbol is meant to help with. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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