1 | /****************************************************************************** |
2 | * hypervisor.h |
3 | * |
4 | * Linux-specific hypervisor handling. |
5 | * |
6 | * Copyright (c) 2002-2004, K A Fraser |
7 | * |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License version 2 |
10 | * as published by the Free Software Foundation; or, when distributed |
11 | * separately from the Linux kernel or incorporated into other |
12 | * software packages, subject to the following license: |
13 | * |
14 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
15 | * of this source file (the "Software"), to deal in the Software without |
16 | * restriction, including without limitation the rights to use, copy, modify, |
17 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
18 | * and to permit persons to whom the Software is furnished to do so, subject to |
19 | * the following conditions: |
20 | * |
21 | * The above copyright notice and this permission notice shall be included in |
22 | * all copies or substantial portions of the Software. |
23 | * |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
25 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
26 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
27 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
28 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
29 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
30 | * IN THE SOFTWARE. |
31 | */ |
32 | |
33 | #ifndef _ASM_X86_XEN_HYPERVISOR_H |
34 | #define _ASM_X86_XEN_HYPERVISOR_H |
35 | |
36 | extern struct shared_info *HYPERVISOR_shared_info; |
37 | extern struct start_info *xen_start_info; |
38 | |
39 | #include <asm/bug.h> |
40 | #include <asm/processor.h> |
41 | |
42 | #define XEN_SIGNATURE "XenVMMXenVMM" |
43 | |
44 | static inline uint32_t xen_cpuid_base(void) |
45 | { |
46 | return hypervisor_cpuid_base(XEN_SIGNATURE, leaves: 2); |
47 | } |
48 | |
49 | struct pci_dev; |
50 | |
51 | #ifdef CONFIG_XEN_PV_DOM0 |
52 | bool xen_initdom_restore_msi(struct pci_dev *dev); |
53 | #else |
54 | static inline bool xen_initdom_restore_msi(struct pci_dev *dev) { return true; } |
55 | #endif |
56 | |
57 | #ifdef CONFIG_HOTPLUG_CPU |
58 | void xen_arch_register_cpu(int num); |
59 | void xen_arch_unregister_cpu(int num); |
60 | #endif |
61 | |
62 | #ifdef CONFIG_PVH |
63 | void __init xen_pvh_init(struct boot_params *boot_params); |
64 | void __init mem_map_via_hcall(struct boot_params *boot_params_p); |
65 | #endif |
66 | |
67 | /* Lazy mode for batching updates / context switch */ |
68 | enum xen_lazy_mode { |
69 | XEN_LAZY_NONE, |
70 | XEN_LAZY_MMU, |
71 | XEN_LAZY_CPU, |
72 | }; |
73 | |
74 | DECLARE_PER_CPU(enum xen_lazy_mode, xen_lazy_mode); |
75 | DECLARE_PER_CPU(unsigned int, xen_lazy_nesting); |
76 | |
77 | static inline void enter_lazy(enum xen_lazy_mode mode) |
78 | { |
79 | enum xen_lazy_mode old_mode = this_cpu_read(xen_lazy_mode); |
80 | |
81 | if (mode == old_mode) { |
82 | this_cpu_inc(xen_lazy_nesting); |
83 | return; |
84 | } |
85 | |
86 | BUG_ON(old_mode != XEN_LAZY_NONE); |
87 | |
88 | this_cpu_write(xen_lazy_mode, mode); |
89 | } |
90 | |
91 | static inline void leave_lazy(enum xen_lazy_mode mode) |
92 | { |
93 | BUG_ON(this_cpu_read(xen_lazy_mode) != mode); |
94 | |
95 | if (this_cpu_read(xen_lazy_nesting) == 0) |
96 | this_cpu_write(xen_lazy_mode, XEN_LAZY_NONE); |
97 | else |
98 | this_cpu_dec(xen_lazy_nesting); |
99 | } |
100 | |
101 | enum xen_lazy_mode xen_get_lazy_mode(void); |
102 | |
103 | #endif /* _ASM_X86_XEN_HYPERVISOR_H */ |
104 | |