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