1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/entry-kvm.h>
4 #include <linux/kvm_host.h>
5
6 static 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
31 int 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 }
49 EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work);
50
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