| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_ENTRYKVM_H |
| #define __LINUX_ENTRYKVM_H |
| |
| #include <linux/static_call_types.h> |
| #include <linux/tracehook.h> |
| #include <linux/syscalls.h> |
| #include <linux/seccomp.h> |
| #include <linux/sched.h> |
| #include <linux/tick.h> |
| |
| /* Transfer to guest mode work */ |
| #ifdef CONFIG_KVM_XFER_TO_GUEST_WORK |
| |
| #ifndef ARCH_XFER_TO_GUEST_MODE_WORK |
| # define ARCH_XFER_TO_GUEST_MODE_WORK (0) |
| #endif |
| |
| #define XFER_TO_GUEST_MODE_WORK \ |
| (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \ |
| _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK) |
| |
| struct kvm_vcpu; |
| |
| /** |
| * arch_xfer_to_guest_mode_handle_work - Architecture specific xfer to guest |
| * mode work handling function. |
| * @vcpu: Pointer to current's VCPU data |
| * @ti_work: Cached TIF flags gathered in xfer_to_guest_mode_handle_work() |
| * |
| * Invoked from xfer_to_guest_mode_handle_work(). Defaults to NOOP. Can be |
| * replaced by architecture specific code. |
| */ |
| static inline int arch_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu, |
| unsigned long ti_work); |
| |
| #ifndef arch_xfer_to_guest_mode_work |
| static inline int arch_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu, |
| unsigned long ti_work) |
| { |
| return 0; |
| } |
| #endif |
| |
| /** |
| * xfer_to_guest_mode_handle_work - Check and handle pending work which needs |
| * to be handled before going to guest mode |
| * @vcpu: Pointer to current's VCPU data |
| * |
| * Returns: 0 or an error code |
| */ |
| int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu); |
| |
| /** |
| * xfer_to_guest_mode_prepare - Perform last minute preparation work that |
| * need to be handled while IRQs are disabled |
| * upon entering to guest. |
| * |
| * Has to be invoked with interrupts disabled before the last call |
| * to xfer_to_guest_mode_work_pending(). |
| */ |
| static inline void xfer_to_guest_mode_prepare(void) |
| { |
| lockdep_assert_irqs_disabled(); |
| tick_nohz_user_enter_prepare(); |
| } |
| |
| /** |
| * __xfer_to_guest_mode_work_pending - Check if work is pending |
| * |
| * Returns: True if work pending, False otherwise. |
| * |
| * Bare variant of xfer_to_guest_mode_work_pending(). Can be called from |
| * interrupt enabled code for racy quick checks with care. |
| */ |
| static inline bool __xfer_to_guest_mode_work_pending(void) |
| { |
| unsigned long ti_work = READ_ONCE(current_thread_info()->flags); |
| |
| return !!(ti_work & XFER_TO_GUEST_MODE_WORK); |
| } |
| |
| /** |
| * xfer_to_guest_mode_work_pending - Check if work is pending which needs to be |
| * handled before returning to guest mode |
| * |
| * Returns: True if work pending, False otherwise. |
| * |
| * Has to be invoked with interrupts disabled before the transition to |
| * guest mode. |
| */ |
| static inline bool xfer_to_guest_mode_work_pending(void) |
| { |
| lockdep_assert_irqs_disabled(); |
| return __xfer_to_guest_mode_work_pending(); |
| } |
| #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ |
| |
| #endif |