On 17.06.21 10:00, Jan Beulich wrote:
On 17.06.2021 06:55, Juergen Gross wrote:On 16.06.21 18:04, Jan Beulich wrote:Since hypercalls from the tool stack are based on ioctl(), and since ioctl() has a return type of "int", I'm afraid there's no way we can deal with this by adjusting function return types in the libraries. Instead we appear to need either a new privcmd ioctl or new XENMEM_* subops (for those cases where potentially large values get returned).I think we can just use a multicall in libxc to wrap the affected operations.Hmm, we might, if we're happy for these to then not work in HVM domains (PVH Dom0, which still is experimental only, or PVH/HVM DomU-s using the libraries for some purpose), or if we finally wire up multicalls in the HVM case (there ought to be a reason why they aren't, but I have no idea what that is).
Me neither, especially as on Arm they are supported. And TBH: PVH Dom0 without multicalls might be hard anyway. Juergen
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