| 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 |