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charset="utf-8" Some sub-functions, XENMEM_maximum_gpfn in particular, can return values requiring more than 31 bits to represent. Hence we cannot issue the hypercall directly when the return value of ioctl() is used to propagate this value (note that this is not the case for the BSDs, and MiniOS already wraps all hypercalls in a multicall). Suggested-by: J=C3=BCrgen Gro=C3=9F Signed-off-by: Jan Beulich --- a/tools/libs/ctrl/xc_private.c +++ b/tools/libs/ctrl/xc_private.c @@ -337,8 +337,47 @@ long do_memory_op(xc_interface *xch, int goto out1; } =20 - ret =3D xencall2(xch->xcall, __HYPERVISOR_memory_op, - cmd, HYPERCALL_BUFFER_AS_ARG(arg)); +#if defined(__linux__) || defined(__sun__) + /* + * Some sub-ops return values which don't fit in "int". On platforms + * without a specific hypercall return value field in the privcmd + * interface structure, issue the request as a single-element multical= l, + * to be able to capture the full return value. + */ + if ( sizeof(long) > sizeof(int) ) + { + multicall_entry_t multicall =3D { + .op =3D __HYPERVISOR_memory_op, + .args[0] =3D cmd, + .args[1] =3D HYPERCALL_BUFFER_AS_ARG(arg), + }, *call =3D &multicall; + DECLARE_HYPERCALL_BOUNCE(call, sizeof(*call), + XC_HYPERCALL_BUFFER_BOUNCE_BOTH); + + if ( xc_hypercall_bounce_pre(xch, call) ) + { + PERROR("Could not bounce buffer for memory_op hypercall"); + goto out1; + } + + ret =3D do_multicall_op(xch, HYPERCALL_BUFFER(call), 1); + + xc_hypercall_bounce_post(xch, call); + + if ( !ret ) + { + ret =3D multicall.result; + if ( multicall.result > ~0xfffUL ) + { + errno =3D -ret; + ret =3D -1; + } + } + } + else +#endif + ret =3D xencall2L(xch->xcall, __HYPERVISOR_memory_op, + cmd, HYPERCALL_BUFFER_AS_ARG(arg)); =20 xc_hypercall_bounce_post(xch, arg); out1: