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935ace2f TG |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __LINUX_ENTRYKVM_H | |
3 | #define __LINUX_ENTRYKVM_H | |
4 | ||
e1c6b9e1 | 5 | #include <linux/static_call_types.h> |
03248add | 6 | #include <linux/resume_user_mode.h> |
e1c6b9e1 OU |
7 | #include <linux/syscalls.h> |
8 | #include <linux/seccomp.h> | |
9 | #include <linux/sched.h> | |
f268c373 | 10 | #include <linux/tick.h> |
935ace2f TG |
11 | |
12 | /* Transfer to guest mode work */ | |
13 | #ifdef CONFIG_KVM_XFER_TO_GUEST_WORK | |
14 | ||
15 | #ifndef ARCH_XFER_TO_GUEST_MODE_WORK | |
16 | # define ARCH_XFER_TO_GUEST_MODE_WORK (0) | |
17 | #endif | |
18 | ||
12db8b69 JA |
19 | #define XFER_TO_GUEST_MODE_WORK \ |
20 | (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \ | |
935ace2f TG |
21 | _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK) |
22 | ||
23 | struct kvm_vcpu; | |
24 | ||
25 | /** | |
26 | * arch_xfer_to_guest_mode_handle_work - Architecture specific xfer to guest | |
27 | * mode work handling function. | |
28 | * @vcpu: Pointer to current's VCPU data | |
29 | * @ti_work: Cached TIF flags gathered in xfer_to_guest_mode_handle_work() | |
30 | * | |
31 | * Invoked from xfer_to_guest_mode_handle_work(). Defaults to NOOP. Can be | |
32 | * replaced by architecture specific code. | |
33 | */ | |
34 | static inline int arch_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu, | |
35 | unsigned long ti_work); | |
36 | ||
37 | #ifndef arch_xfer_to_guest_mode_work | |
38 | static inline int arch_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu, | |
39 | unsigned long ti_work) | |
40 | { | |
41 | return 0; | |
42 | } | |
43 | #endif | |
44 | ||
45 | /** | |
46 | * xfer_to_guest_mode_handle_work - Check and handle pending work which needs | |
47 | * to be handled before going to guest mode | |
48 | * @vcpu: Pointer to current's VCPU data | |
49 | * | |
50 | * Returns: 0 or an error code | |
51 | */ | |
52 | int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu); | |
53 | ||
4ae7dc97 FW |
54 | /** |
55 | * xfer_to_guest_mode_prepare - Perform last minute preparation work that | |
56 | * need to be handled while IRQs are disabled | |
57 | * upon entering to guest. | |
58 | * | |
59 | * Has to be invoked with interrupts disabled before the last call | |
60 | * to xfer_to_guest_mode_work_pending(). | |
61 | */ | |
62 | static inline void xfer_to_guest_mode_prepare(void) | |
63 | { | |
64 | lockdep_assert_irqs_disabled(); | |
f268c373 | 65 | tick_nohz_user_enter_prepare(); |
4ae7dc97 FW |
66 | } |
67 | ||
935ace2f TG |
68 | /** |
69 | * __xfer_to_guest_mode_work_pending - Check if work is pending | |
70 | * | |
71 | * Returns: True if work pending, False otherwise. | |
72 | * | |
73 | * Bare variant of xfer_to_guest_mode_work_pending(). Can be called from | |
74 | * interrupt enabled code for racy quick checks with care. | |
75 | */ | |
76 | static inline bool __xfer_to_guest_mode_work_pending(void) | |
77 | { | |
6ce89512 | 78 | unsigned long ti_work = read_thread_flags(); |
935ace2f TG |
79 | |
80 | return !!(ti_work & XFER_TO_GUEST_MODE_WORK); | |
81 | } | |
82 | ||
83 | /** | |
84 | * xfer_to_guest_mode_work_pending - Check if work is pending which needs to be | |
85 | * handled before returning to guest mode | |
86 | * | |
87 | * Returns: True if work pending, False otherwise. | |
88 | * | |
89 | * Has to be invoked with interrupts disabled before the transition to | |
90 | * guest mode. | |
91 | */ | |
92 | static inline bool xfer_to_guest_mode_work_pending(void) | |
93 | { | |
94 | lockdep_assert_irqs_disabled(); | |
95 | return __xfer_to_guest_mode_work_pending(); | |
96 | } | |
97 | #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ | |
98 | ||
99 | #endif |