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 */
x86_confidential_guest_kvm_type(X86ConfidentialGuest * cg)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 */
x86_confidential_guest_mask_cpuid_features(X86ConfidentialGuest * cg,uint32_t feature,uint32_t index,int reg,uint32_t value)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