1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 * features.c 4 * 5 * Xen feature flags. 6 * 7 * Copyright (c) 2006, Ian Campbell, XenSource Inc. 8 */ 9 #include <linux/types.h> 10 #include <linux/cache.h> 11 #include <linux/export.h> 12 13 #include <asm/xen/hypercall.h> 14 15 #include <xen/interface/xen.h> 16 #include <xen/interface/version.h> 17 #include <xen/features.h> 18 19 u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly; 20 EXPORT_SYMBOL_GPL(xen_features); 21 22 void xen_setup_features(void) 23 { 24 struct xen_feature_info fi; 25 int i, j; 26 27 for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) { 28 fi.submap_idx = i; 29 if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0) 30 break; 31 for (j = 0; j < 32; j++) 32 xen_features[i * 32 + j] = !!(fi.submap & 1<<j); 33 } 34 } 35