1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_ENTRYKVM_H
3 #define __LINUX_ENTRYKVM_H
5 #include <linux/entry-common.h>
6 #include <linux/tick.h>
8 /* Transfer to guest mode work */
9 #ifdef CONFIG_KVM_XFER_TO_GUEST_WORK
11 #ifndef ARCH_XFER_TO_GUEST_MODE_WORK
12 # define ARCH_XFER_TO_GUEST_MODE_WORK (0)
15 #define XFER_TO_GUEST_MODE_WORK \
16 (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \
17 _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK)
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()
27 * Invoked from xfer_to_guest_mode_handle_work(). Defaults to NOOP. Can be
28 * replaced by architecture specific code.
30 static inline int arch_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu,
31 unsigned long ti_work);
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)
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
46 * Returns: 0 or an error code
48 int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu);
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.
55 * Has to be invoked with interrupts disabled before the last call
56 * to xfer_to_guest_mode_work_pending().
58 static inline void xfer_to_guest_mode_prepare(void)
60 lockdep_assert_irqs_disabled();
61 tick_nohz_user_enter_prepare();
65 * __xfer_to_guest_mode_work_pending - Check if work is pending
67 * Returns: True if work pending, False otherwise.
69 * Bare variant of xfer_to_guest_mode_work_pending(). Can be called from
70 * interrupt enabled code for racy quick checks with care.
72 static inline bool __xfer_to_guest_mode_work_pending(void)
74 unsigned long ti_work = READ_ONCE(current_thread_info()->flags);
76 return !!(ti_work & XFER_TO_GUEST_MODE_WORK);
80 * xfer_to_guest_mode_work_pending - Check if work is pending which needs to be
81 * handled before returning to guest mode
83 * Returns: True if work pending, False otherwise.
85 * Has to be invoked with interrupts disabled before the transition to
88 static inline bool xfer_to_guest_mode_work_pending(void)
90 lockdep_assert_irqs_disabled();
91 return __xfer_to_guest_mode_work_pending();
93 #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */