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 14 #define XFER_TO_GUEST_MODE_WORK \ 15 (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \ 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_prepare - Perform last minute preparation work that 51 * need to be handled while IRQs are disabled 52 * upon entering to guest. 53 * 54 * Has to be invoked with interrupts disabled before the last call 55 * to xfer_to_guest_mode_work_pending(). 56 */ 57 static inline void xfer_to_guest_mode_prepare(void) 58 { 59 lockdep_assert_irqs_disabled(); 60 rcu_nocb_flush_deferred_wakeup(); 61 } 62 63 /** 64 * __xfer_to_guest_mode_work_pending - Check if work is pending 65 * 66 * Returns: True if work pending, False otherwise. 67 * 68 * Bare variant of xfer_to_guest_mode_work_pending(). Can be called from 69 * interrupt enabled code for racy quick checks with care. 70 */ 71 static inline bool __xfer_to_guest_mode_work_pending(void) 72 { 73 unsigned long ti_work = READ_ONCE(current_thread_info()->flags); 74 75 return !!(ti_work & XFER_TO_GUEST_MODE_WORK); 76 } 77 78 /** 79 * xfer_to_guest_mode_work_pending - Check if work is pending which needs to be 80 * handled before returning to guest mode 81 * 82 * Returns: True if work pending, False otherwise. 83 * 84 * Has to be invoked with interrupts disabled before the transition to 85 * guest mode. 86 */ 87 static inline bool xfer_to_guest_mode_work_pending(void) 88 { 89 lockdep_assert_irqs_disabled(); 90 return __xfer_to_guest_mode_work_pending(); 91 } 92 #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ 93 94 #endif 95