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