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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> | |
6 | ||
7 | /* Transfer to guest mode work */ | |
8 | #ifdef CONFIG_KVM_XFER_TO_GUEST_WORK | |
9 | ||
10 | #ifndef ARCH_XFER_TO_GUEST_MODE_WORK | |
11 | # define ARCH_XFER_TO_GUEST_MODE_WORK (0) | |
12 | #endif | |
13 | ||
12db8b69 JA |
14 | #define XFER_TO_GUEST_MODE_WORK \ |
15 | (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \ | |
935ace2f TG |
16 | _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK) |
17 | ||
18 | struct kvm_vcpu; | |
19 | ||
20 | /** | |
21 | * arch_xfer_to_guest_mode_handle_work - Architecture specific xfer to guest | |
22 | * mode work handling function. | |
23 | * @vcpu: Pointer to current's VCPU data | |
24 | * @ti_work: Cached TIF flags gathered in xfer_to_guest_mode_handle_work() | |
25 | * | |
26 | * Invoked from xfer_to_guest_mode_handle_work(). Defaults to NOOP. Can be | |
27 | * replaced by architecture specific code. | |
28 | */ | |
29 | static inline int arch_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu, | |
30 | unsigned long ti_work); | |
31 | ||
32 | #ifndef arch_xfer_to_guest_mode_work | |
33 | static inline int arch_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu, | |
34 | unsigned long ti_work) | |
35 | { | |
36 | return 0; | |
37 | } | |
38 | #endif | |
39 | ||
40 | /** | |
41 | * xfer_to_guest_mode_handle_work - Check and handle pending work which needs | |
42 | * to be handled before going to guest mode | |
43 | * @vcpu: Pointer to current's VCPU data | |
44 | * | |
45 | * Returns: 0 or an error code | |
46 | */ | |
47 | int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu); | |
48 | ||
49 | /** | |
50 | * __xfer_to_guest_mode_work_pending - Check if work is pending | |
51 | * | |
52 | * Returns: True if work pending, False otherwise. | |
53 | * | |
54 | * Bare variant of xfer_to_guest_mode_work_pending(). Can be called from | |
55 | * interrupt enabled code for racy quick checks with care. | |
56 | */ | |
57 | static inline bool __xfer_to_guest_mode_work_pending(void) | |
58 | { | |
59 | unsigned long ti_work = READ_ONCE(current_thread_info()->flags); | |
60 | ||
61 | return !!(ti_work & XFER_TO_GUEST_MODE_WORK); | |
62 | } | |
63 | ||
64 | /** | |
65 | * xfer_to_guest_mode_work_pending - Check if work is pending which needs to be | |
66 | * handled before returning to guest mode | |
67 | * | |
68 | * Returns: True if work pending, False otherwise. | |
69 | * | |
70 | * Has to be invoked with interrupts disabled before the transition to | |
71 | * guest mode. | |
72 | */ | |
73 | static inline bool xfer_to_guest_mode_work_pending(void) | |
74 | { | |
75 | lockdep_assert_irqs_disabled(); | |
76 | return __xfer_to_guest_mode_work_pending(); | |
77 | } | |
78 | #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ | |
79 | ||
80 | #endif |