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