xref: /openbmc/qemu/include/sysemu/kvm_xen.h (revision 18e83f28)
1 /*
2  * Xen HVM emulation support in KVM
3  *
4  * Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
5  * Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
6  *
7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
8  * See the COPYING file in the top-level directory.
9  *
10  */
11 
12 #ifndef QEMU_SYSEMU_KVM_XEN_H
13 #define QEMU_SYSEMU_KVM_XEN_H
14 
15 /* The KVM API uses these to indicate "no GPA" or "no GFN" */
16 #define INVALID_GPA UINT64_MAX
17 #define INVALID_GFN UINT64_MAX
18 
19 /* QEMU plays the rôle of dom0 for "interdomain" communication. */
20 #define DOMID_QEMU  0
21 
22 int kvm_xen_soft_reset(void);
23 uint32_t kvm_xen_get_caps(void);
24 void *kvm_xen_get_vcpu_info_hva(uint32_t vcpu_id);
25 bool kvm_xen_has_vcpu_callback_vector(void);
26 void kvm_xen_inject_vcpu_callback_vector(uint32_t vcpu_id, int type);
27 void kvm_xen_set_callback_asserted(void);
28 int kvm_xen_set_vcpu_virq(uint32_t vcpu_id, uint16_t virq, uint16_t port);
29 uint16_t kvm_xen_get_gnttab_max_frames(void);
30 uint16_t kvm_xen_get_evtchn_max_pirq(void);
31 
32 #define kvm_xen_has_cap(cap) (!!(kvm_xen_get_caps() &           \
33                                  KVM_XEN_HVM_CONFIG_ ## cap))
34 
35 #define XEN_SPECIAL_AREA_ADDR 0xfeff8000UL
36 #define XEN_SPECIAL_AREA_SIZE 0x4000UL
37 
38 #define XEN_SPECIALPAGE_CONSOLE     0
39 #define XEN_SPECIALPAGE_XENSTORE    1
40 
41 #define XEN_SPECIAL_PFN(x) ((XEN_SPECIAL_AREA_ADDR >> TARGET_PAGE_BITS) + \
42                             XEN_SPECIALPAGE_##x)
43 
44 #endif /* QEMU_SYSEMU_KVM_XEN_H */
45