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