1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_ENTRYVIRT_H 3 #define __LINUX_ENTRYVIRT_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_VIRT_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 24 /** 25 * arch_xfer_to_guest_mode_handle_work - Architecture specific xfer to guest 26 * mode work handling function. 27 * @vcpu: Pointer to current's VCPU data 28 * @ti_work: Cached TIF flags gathered in xfer_to_guest_mode_handle_work() 29 * 30 * Invoked from xfer_to_guest_mode_handle_work(). Defaults to NOOP. Can be 31 * replaced by architecture specific code. 32 */ 33 static inline int arch_xfer_to_guest_mode_handle_work(unsigned long ti_work); 34 35 #ifndef arch_xfer_to_guest_mode_work arch_xfer_to_guest_mode_handle_work(unsigned long ti_work)36static inline int arch_xfer_to_guest_mode_handle_work(unsigned long ti_work) 37 { 38 return 0; 39 } 40 #endif 41 42 /** 43 * xfer_to_guest_mode_handle_work - Check and handle pending work which needs 44 * to be handled before going to guest mode 45 * 46 * Returns: 0 or an error code 47 */ 48 int xfer_to_guest_mode_handle_work(void); 49 50 /** 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. 54 * 55 * Has to be invoked with interrupts disabled before the last call 56 * to xfer_to_guest_mode_work_pending(). 57 */ xfer_to_guest_mode_prepare(void)58static inline void xfer_to_guest_mode_prepare(void) 59 { 60 lockdep_assert_irqs_disabled(); 61 tick_nohz_user_enter_prepare(); 62 } 63 64 /** 65 * __xfer_to_guest_mode_work_pending - Check if work is pending 66 * 67 * Returns: True if work pending, False otherwise. 68 * 69 * Bare variant of xfer_to_guest_mode_work_pending(). Can be called from 70 * interrupt enabled code for racy quick checks with care. 71 */ __xfer_to_guest_mode_work_pending(void)72static inline bool __xfer_to_guest_mode_work_pending(void) 73 { 74 unsigned long ti_work = read_thread_flags(); 75 76 return !!(ti_work & XFER_TO_GUEST_MODE_WORK); 77 } 78 79 /** 80 * xfer_to_guest_mode_work_pending - Check if work is pending which needs to be 81 * handled before returning to guest mode 82 * 83 * Returns: True if work pending, False otherwise. 84 * 85 * Has to be invoked with interrupts disabled before the transition to 86 * guest mode. 87 */ xfer_to_guest_mode_work_pending(void)88static inline bool xfer_to_guest_mode_work_pending(void) 89 { 90 lockdep_assert_irqs_disabled(); 91 return __xfer_to_guest_mode_work_pending(); 92 } 93 #endif /* CONFIG_VIRT_XFER_TO_GUEST_WORK */ 94 95 #endif 96