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 | _TIF_NOTIFY_SIGNAL)) {
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			resume_user_mode_work(NULL);
21
22		ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
23		if (ret)
24			return ret;
25
26		ti_work = read_thread_flags();
27	} while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched());
28	return 0;
29}
30
31int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu)
32{
33	unsigned long ti_work;
34
35	/*
36	 * This is invoked from the outer guest loop with interrupts and
37	 * preemption enabled.
38	 *
39	 * KVM invokes xfer_to_guest_mode_work_pending() with interrupts
40	 * disabled in the inner loop before going into guest mode. No need
41	 * to disable interrupts here.
42	 */
43	ti_work = read_thread_flags();
44	if (!(ti_work & XFER_TO_GUEST_MODE_WORK))
45		return 0;
46
47	return xfer_to_guest_mode_work(vcpu, ti_work);
48}
49EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work);