1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2/*
 3 * Copyright IBM Corp. 2008
 4 *
 5 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 6 */
 7
 8#ifndef __POWERPC_KVM_PARA_H__
 9#define __POWERPC_KVM_PARA_H__
10
11#include <linux/types.h>
12
13/*
14 * Additions to this struct must only occur at the end, and should be
15 * accompanied by a KVM_MAGIC_FEAT flag to advertise that they are present
16 * (albeit not necessarily relevant to the current target hardware platform).
17 *
18 * Struct fields are always 32 or 64 bit aligned, depending on them being 32
19 * or 64 bit wide respectively.
20 *
21 * See Documentation/virt/kvm/ppc-pv.rst
22 */
23struct kvm_vcpu_arch_shared {
24	__u64 scratch1;
25	__u64 scratch2;
26	__u64 scratch3;
27	__u64 critical;		/* Guest may not get interrupts if == r1 */
28	__u64 sprg0;
29	__u64 sprg1;
30	__u64 sprg2;
31	__u64 sprg3;
32	__u64 srr0;
33	__u64 srr1;
34	__u64 dar;		/* dear on BookE */
35	__u64 msr;
36	__u32 dsisr;
37	__u32 int_pending;	/* Tells the guest if we have an interrupt */
38	__u32 sr[16];
39	__u32 mas0;
40	__u32 mas1;
41	__u64 mas7_3;
42	__u64 mas2;
43	__u32 mas4;
44	__u32 mas6;
45	__u32 esr;
46	__u32 pir;
47
48	/*
49	 * SPRG4-7 are user-readable, so we can only keep these consistent
50	 * between the shared area and the real registers when there's an
51	 * intervening exit to KVM.  This also applies to SPRG3 on some
52	 * chips.
53	 *
54	 * This suffices for access by guest userspace, since in PR-mode
55	 * KVM, an exit must occur when changing the guest's MSR[PR].
56	 * If the guest kernel writes to SPRG3-7 via the shared area, it
57	 * must also use the shared area for reading while in kernel space.
58	 */
59	__u64 sprg4;
60	__u64 sprg5;
61	__u64 sprg6;
62	__u64 sprg7;
63};
64
65#define KVM_SC_MAGIC_R0		0x4b564d21 /* "KVM!" */
66
67#define KVM_HCALL_TOKEN(num)     _EV_HCALL_TOKEN(EV_KVM_VENDOR_ID, num)
68
69#include <asm/epapr_hcalls.h>
70
71#define KVM_FEATURE_MAGIC_PAGE	1
72
73/* Magic page flags from host to guest */
74
75#define KVM_MAGIC_FEAT_SR		(1 << 0)
76
77/* MASn, ESR, PIR, and high SPRGs */
78#define KVM_MAGIC_FEAT_MAS0_TO_SPRG7	(1 << 1)
79
80/* Magic page flags from guest to host */
81
82#define MAGIC_PAGE_FLAG_NOT_MAPPED_NX	(1 << 0)
83
84
85#endif /* __POWERPC_KVM_PARA_H__ */