KVM: introduce kvm_read_guest_cached

Introduce kvm_read_guest_cached() function in addition to write one we
already have.

[ by glauber: export function signature in kvm header ]

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Glauber Costa <glommer@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Tested-by: Eric Munson <emunson@mgebm.net>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 11d2783eb9df..d5ef9ebcaff7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1418,6 +1418,26 @@ int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 }
 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
 
+int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
+                           void *data, unsigned long len)
+{
+        struct kvm_memslots *slots = kvm_memslots(kvm);
+        int r;
+
+        if (slots->generation != ghc->generation)
+                kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
+
+        if (kvm_is_error_hva(ghc->hva))
+                return -EFAULT;
+
+        r = __copy_from_user(data, (void __user *)ghc->hva, len);
+        if (r)
+                return -EFAULT;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
+
 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
 {
         return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,