virt.c

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