LXR linux/include/linux/entry-kvm.h

   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
  18struct 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 */
  29static 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
  33static 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 */
  47int 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 */
  57static 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 */
  73static 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
  81