projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 935ace2f TG |
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 | \ | |
| 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_work_pending - Check if work is pending | |
| 51 | * | |
| 52 | * Returns: True if work pending, False otherwise. | |
| 53 | * | |
| 54 | * Bare variant of xfer_to_guest_mode_work_pending(). Can be called from | |
| 55 | * interrupt enabled code for racy quick checks with care. | |
| 56 | */ | |
| 57 | static inline bool __xfer_to_guest_mode_work_pending(void) | |
| 58 | { | |
| 59 | unsigned long ti_work = READ_ONCE(current_thread_info()->flags); | |
| 60 | ||
| 61 | return !!(ti_work & XFER_TO_GUEST_MODE_WORK); | |
| 62 | } | |
| 63 | ||
| 64 | /** | |
| 65 | * xfer_to_guest_mode_work_pending - Check if work is pending which needs to be | |
| 66 | * handled before returning to guest mode | |
| 67 | * | |
| 68 | * Returns: True if work pending, False otherwise. | |
| 69 | * | |
| 70 | * Has to be invoked with interrupts disabled before the transition to | |
| 71 | * guest mode. | |
| 72 | */ | |
| 73 | static inline bool xfer_to_guest_mode_work_pending(void) | |
| 74 | { | |
| 75 | lockdep_assert_irqs_disabled(); | |
| 76 | return __xfer_to_guest_mode_work_pending(); | |
| 77 | } | |
| 78 | #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ | |
| 79 | ||
| 80 | #endif |