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authorGleb Natapov <gleb@redhat.com>2011-07-11 15:28:11 -0400
committerAvi Kivity <avi@redhat.com>2011-07-12 13:17:01 +0300
commite03b644fe68b1c6401465b02724d261538dba10f (patch)
tree9bb12d9ca9a74865618919e10922b2483a8cacdb /virt
parent29d03158f9d400450c17bb25ee0533b52f651d04 (diff)
downloadlinux-e03b644fe68b1c6401465b02724d261538dba10f.tar.gz
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>
Diffstat (limited to 'virt')
-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 11d2783eb9d..d5ef9ebcaff 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,