1 /*
2  * x86-specific confidential guest methods.
3  *
4  * Copyright (c) 2024 Red Hat Inc.
5  *
6  * Authors:
7  *  Paolo Bonzini <pbonzini@redhat.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
10  * See the COPYING file in the top-level directory.
11  */
12 #ifndef TARGET_I386_CG_H
13 #define TARGET_I386_CG_H
14 
15 #include "qom/object.h"
16 
17 #include "exec/confidential-guest-support.h"
18 
19 #define TYPE_X86_CONFIDENTIAL_GUEST "x86-confidential-guest"
20 
21 OBJECT_DECLARE_TYPE(X86ConfidentialGuest,
22                     X86ConfidentialGuestClass,
23                     X86_CONFIDENTIAL_GUEST)
24 
25 struct X86ConfidentialGuest {
26     /* <private> */
27     ConfidentialGuestSupport parent_obj;
28 };
29 
30 /**
31  * X86ConfidentialGuestClass:
32  *
33  * Class to be implemented by confidential-guest-support concrete objects
34  * for the x86 target.
35  */
36 struct X86ConfidentialGuestClass {
37     /* <private> */
38     ConfidentialGuestSupportClass parent;
39 
40     /* <public> */
41     int (*kvm_type)(X86ConfidentialGuest *cg);
42     uint32_t (*mask_cpuid_features)(X86ConfidentialGuest *cg, uint32_t feature, uint32_t index,
43                                     int reg, uint32_t value);
44 };
45 
46 /**
47  * x86_confidential_guest_kvm_type:
48  *
49  * Calls #X86ConfidentialGuestClass.unplug callback of @plug_handler.
50  */
51 static inline int x86_confidential_guest_kvm_type(X86ConfidentialGuest *cg)
52 {
53     X86ConfidentialGuestClass *klass = X86_CONFIDENTIAL_GUEST_GET_CLASS(cg);
54 
55     if (klass->kvm_type) {
56         return klass->kvm_type(cg);
57     } else {
58         return 0;
59     }
60 }
61 
62 /**
63  * x86_confidential_guest_mask_cpuid_features:
64  *
65  * Removes unsupported features from a confidential guest's CPUID values, returns
66  * the value with the bits removed.  The bits removed should be those that KVM
67  * provides independent of host-supported CPUID features, but are not supported by
68  * the confidential computing firmware.
69  */
70 static inline int x86_confidential_guest_mask_cpuid_features(X86ConfidentialGuest *cg,
71                                                              uint32_t feature, uint32_t index,
72                                                              int reg, uint32_t value)
73 {
74     X86ConfidentialGuestClass *klass = X86_CONFIDENTIAL_GUEST_GET_CLASS(cg);
75 
76     if (klass->mask_cpuid_features) {
77         return klass->mask_cpuid_features(cg, feature, index, reg, value);
78     } else {
79         return value;
80     }
81 }
82 
83 #endif
84