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-rw-r--r--virt/kvm/kvm_main.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 678e80561b74..8d0b7c16c2f7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -541,6 +541,26 @@ int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
}
EXPORT_SYMBOL_GPL(kvm_read_guest);
+int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
+ unsigned long len)
+{
+ int r;
+ unsigned long addr;
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+ int offset = offset_in_page(gpa);
+
+ addr = gfn_to_hva(kvm, gfn);
+ if (kvm_is_error_hva(addr))
+ return -EFAULT;
+ pagefault_disable();
+ r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
+ pagefault_enable();
+ if (r)
+ return -EFAULT;
+ return 0;
+}
+EXPORT_SYMBOL(kvm_read_guest_atomic);
+
int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
int offset, int len)
{