ARM architecture does not implement I/O ports. Ignore this call on ARM to avoid the overhead of making a hypercall just for Xen to return -ENOSYS.
Signed-off-by: Rahul Singh <rahul.si...@arm.com> Reviewed-by: Stefano Stabellini <sstabell...@kernel.org> Reviewed-by: Bertrand Marquis <bertrand.marq...@arm.com> --- Change in v5: none Change in v4: - Added Reviewed-by: Bertrand Marquis <bertrand.marq...@arm.com> Change in v3: Added Reviewed-by: Stefano Stabellini <sstabell...@kernel.org> Change in v2: - Instead of returning success in XEN, ignored the call in xl. --- --- tools/libs/ctrl/xc_domain.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/libs/ctrl/xc_domain.c b/tools/libs/ctrl/xc_domain.c index 23322b70b5..25c95f6596 100644 --- a/tools/libs/ctrl/xc_domain.c +++ b/tools/libs/ctrl/xc_domain.c @@ -1348,6 +1348,14 @@ int xc_domain_ioport_permission(xc_interface *xch, uint32_t nr_ports, uint32_t allow_access) { +#if defined(__arm__) || defined(__aarch64__) + /* + * The ARM architecture does not implement I/O ports. + * Avoid the overhead of making a hypercall just for Xen to return -ENOSYS. + * It is safe to ignore this call on ARM so we just return 0. + */ + return 0; +#else DECLARE_DOMCTL; domctl.cmd = XEN_DOMCTL_ioport_permission; @@ -1357,6 +1365,7 @@ int xc_domain_ioport_permission(xc_interface *xch, domctl.u.ioport_permission.allow_access = allow_access; return do_domctl(xch, &domctl); +#endif } int xc_availheap(xc_interface *xch, -- 2.25.1