]>
Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5ead97c8 JF |
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> | |
59aa56bf | 11 | #include <linux/export.h> |
ac4c403c | 12 | #include <linux/printk.h> |
ecbf29cd JF |
13 | |
14 | #include <asm/xen/hypercall.h> | |
15 | ||
ac4c403c | 16 | #include <xen/xen.h> |
ecbf29cd JF |
17 | #include <xen/interface/xen.h> |
18 | #include <xen/interface/version.h> | |
5ead97c8 JF |
19 | #include <xen/features.h> |
20 | ||
ac4c403c JG |
21 | /* |
22 | * Linux kernel expects at least Xen 4.0. | |
23 | * | |
24 | * Assume some features to be available for that reason (depending on guest | |
25 | * mode, of course). | |
26 | */ | |
27 | #define chk_required_feature(f) { \ | |
28 | if (!xen_feature(f)) \ | |
29 | panic("Xen: feature %s not available!\n", #f); \ | |
30 | } | |
31 | ||
5ead97c8 JF |
32 | u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly; |
33 | EXPORT_SYMBOL_GPL(xen_features); | |
34 | ||
35 | void xen_setup_features(void) | |
36 | { | |
37 | struct xen_feature_info fi; | |
38 | int i, j; | |
39 | ||
40 | for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) { | |
41 | fi.submap_idx = i; | |
42 | if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0) | |
43 | break; | |
44 | for (j = 0; j < 32; j++) | |
45 | xen_features[i * 32 + j] = !!(fi.submap & 1<<j); | |
46 | } | |
ac4c403c JG |
47 | |
48 | if (xen_pv_domain()) { | |
49 | chk_required_feature(XENFEAT_mmu_pt_update_preserve_ad); | |
50 | chk_required_feature(XENFEAT_gnttab_map_avail_bits); | |
51 | } | |
5ead97c8 | 52 | } |