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-rw-r--r--kernel/entry/kvm.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/kernel/entry/kvm.c b/kernel/entry/kvm.c
new file mode 100644
index 000000000..2e0f75bcb
--- /dev/null
+++ b/kernel/entry/kvm.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/entry-kvm.h>
+#include <linux/kvm_host.h>
+
+static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work)
+{
+ do {
+ int ret;
+
+ if (ti_work & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) {
+ kvm_handle_signal_exit(vcpu);
+ return -EINTR;
+ }
+
+ if (ti_work & _TIF_NEED_RESCHED)
+ schedule();
+
+ if (ti_work & _TIF_NOTIFY_RESUME)
+ resume_user_mode_work(NULL);
+
+ ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
+ if (ret)
+ return ret;
+
+ ti_work = read_thread_flags();
+ } while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched());
+ return 0;
+}
+
+int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu)
+{
+ unsigned long ti_work;
+
+ /*
+ * This is invoked from the outer guest loop with interrupts and
+ * preemption enabled.
+ *
+ * KVM invokes xfer_to_guest_mode_work_pending() with interrupts
+ * disabled in the inner loop before going into guest mode. No need
+ * to disable interrupts here.
+ */
+ ti_work = read_thread_flags();
+ if (!(ti_work & XFER_TO_GUEST_MODE_WORK))
+ return 0;
+
+ return xfer_to_guest_mode_work(vcpu, ti_work);
+}
+EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work);