1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/entry-kvm.h>
 4#include <linux/kvm_host.h>
 5
 6static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work)
 7{
 8	do {
 9		int ret;
10
11		if (ti_work & _TIF_SIGPENDING) {
12			kvm_handle_signal_exit(vcpu);
13			return -EINTR;
14		}
15
16		if (ti_work & _TIF_NEED_RESCHED)
17			schedule();
18
19		if (ti_work & _TIF_NOTIFY_RESUME) {
20			clear_thread_flag(TIF_NOTIFY_RESUME);
21			tracehook_notify_resume(NULL);
22		}
23
24		ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
25		if (ret)
26			return ret;
27
28		ti_work = READ_ONCE(current_thread_info()->flags);
29	} while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched());
30	return 0;
31}
32
33int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu)
34{
35	unsigned long ti_work;
36
37	/*
38	 * This is invoked from the outer guest loop with interrupts and
39	 * preemption enabled.
40	 *
41	 * KVM invokes xfer_to_guest_mode_work_pending() with interrupts
42	 * disabled in the inner loop before going into guest mode. No need
43	 * to disable interrupts here.
44	 */
45	ti_work = READ_ONCE(current_thread_info()->flags);
46	if (!(ti_work & XFER_TO_GUEST_MODE_WORK))
47		return 0;
48
49	return xfer_to_guest_mode_work(vcpu, ti_work);
50}
51EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work);