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features.h
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1 /******************************************************************************
2  * features.h
3  *
4  * Feature flags, reported by XENVER_get_features.
5  *
6  * Copyright (c) 2006, Keir Fraser <[email protected]>
7  */
8 
9 #ifndef __XEN_PUBLIC_FEATURES_H__
10 #define __XEN_PUBLIC_FEATURES_H__
11 
12 /*
13  * If set, the guest does not need to write-protect its pagetables, and can
14  * update them via direct writes.
15  */
16 #define XENFEAT_writable_page_tables 0
17 
18 /*
19  * If set, the guest does not need to write-protect its segment descriptor
20  * tables, and can update them via direct writes.
21  */
22 #define XENFEAT_writable_descriptor_tables 1
23 
24 /*
25  * If set, translation between the guest's 'pseudo-physical' address space
26  * and the host's machine address space are handled by the hypervisor. In this
27  * mode the guest does not need to perform phys-to/from-machine translations
28  * when performing page table operations.
29  */
30 #define XENFEAT_auto_translated_physmap 2
31 
32 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
33 #define XENFEAT_supervisor_mode_kernel 3
34 
35 /*
36  * If set, the guest does not need to allocate x86 PAE page directories
37  * below 4GB. This flag is usually implied by auto_translated_physmap.
38  */
39 #define XENFEAT_pae_pgdir_above_4gb 4
40 
41 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
42 #define XENFEAT_mmu_pt_update_preserve_ad 5
43 
44 /* x86: Does this Xen host support the HVM callback vector type? */
45 #define XENFEAT_hvm_callback_vector 8
46 
47 /* x86: pvclock algorithm is safe to use on HVM */
48 #define XENFEAT_hvm_safe_pvclock 9
49 
50 /* x86: pirq can be used by HVM guests */
51 #define XENFEAT_hvm_pirqs 10
52 
53 /* operation as Dom0 is supported */
54 #define XENFEAT_dom0 11
55 
56 #define XENFEAT_NR_SUBMAPS 1
57 
58 #endif /* __XEN_PUBLIC_FEATURES_H__ */