KVM: introduce gfn_to_hva_read/kvm_read_hva/kvm_read_hva_atomic

This set of functions is only used to read data from host space, in the
later patch, we will only get a readonly hva in gfn_to_hva_read, and
the function name is a good hint to let gfn_to_hva_read to pair with
kvm_read_hva()/kvm_read_hva_atomic()

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 543f9b7e5aa282016bb753d5f36d10aa40bd72e0..6e3ea15397d41c66557b880ae86e1593a0cdf3ce 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1002,6 +1002,25 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 }
 EXPORT_SYMBOL_GPL(gfn_to_hva);
 
+/*
+ * The hva returned by this function is only allowed to be read.
+ * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
+ */
+static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn)
+{
+       return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
+}
+
+static int kvm_read_hva(void *data, void __user *hva, int len)
+{
+       return __copy_from_user(data, hva, len);
+}
+
+static int kvm_read_hva_atomic(void *data, void __user *hva, int len)
+{
+       return __copy_from_user_inatomic(data, hva, len);
+}
+
 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
        unsigned long start, int write, struct page **page)
 {
@@ -1274,10 +1293,10 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
        int r;
        unsigned long addr;
 
-       addr = gfn_to_hva(kvm, gfn);
+       addr = gfn_to_hva_read(kvm, gfn);
        if (kvm_is_error_hva(addr))
                return -EFAULT;
-       r = __copy_from_user(data, (void __user *)addr + offset, len);
+       r = kvm_read_hva(data, (void __user *)addr + offset, len);
        if (r)
                return -EFAULT;
        return 0;
@@ -1312,11 +1331,11 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
        gfn_t gfn = gpa >> PAGE_SHIFT;
        int offset = offset_in_page(gpa);
 
-       addr = gfn_to_hva(kvm, gfn);
+       addr = gfn_to_hva_read(kvm, gfn);
        if (kvm_is_error_hva(addr))
                return -EFAULT;
        pagefault_disable();
-       r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
+       r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len);
        pagefault_enable();
        if (r)
                return -EFAULT;