kvm: Faults which trigger IO release the mmap_sem

[pandora-kernel.git] / include / linux / kvm_host.h

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index d44a2d6..45aaeb3 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -198,6 +198,17 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
 int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 #endif
 
+/*
+ * Carry out a gup that requires IO. Allow the mm to relinquish the mmap
+ * semaphore if the filemap/swap has to wait on a page lock. pagep == NULL
+ * controls whether we retry the gup one more time to completion in that case.
+ * Typically this is called after a FAULT_FLAG_RETRY_NOWAIT in the main tdp
+ * handler.
+ */
+int kvm_get_user_page_io(struct task_struct *tsk, struct mm_struct *mm,
+                        unsigned long addr, bool write_fault,
+                        struct page **pagep);
+
 enum {
        OUTSIDE_GUEST_MODE,
        IN_GUEST_MODE,