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authorVitaly Kuznetsov <vkuznets@redhat.com>2020-05-25 16:41:19 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2020-06-01 04:26:07 -0400
commit0958f0cefede403037653e44de0e3332d10b0e1a (patch)
tree466df4d6eff1380ac760270f53b3ccf4f62fb281 /virt/kvm
parent7c0ade6c9023b2b90b757e2927b306bec1cc4ca6 (diff)
KVM: introduce kvm_read_guest_offset_cached()
We already have kvm_write_guest_offset_cached(), introduce read analogue. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20200525144125.143875-5-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/kvm_main.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c9c6db5f77c2..e2af6ffce9c9 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2510,13 +2510,15 @@ 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)
+int kvm_read_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
+ void *data, unsigned int offset,
+ unsigned long len)
{
struct kvm_memslots *slots = kvm_memslots(kvm);
int r;
+ gpa_t gpa = ghc->gpa + offset;
- BUG_ON(len > ghc->len);
+ BUG_ON(len + offset > ghc->len);
if (slots->generation != ghc->generation) {
if (__kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len))
@@ -2527,14 +2529,21 @@ int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
return -EFAULT;
if (unlikely(!ghc->memslot))
- return kvm_read_guest(kvm, ghc->gpa, data, len);
+ return kvm_read_guest(kvm, gpa, data, len);
- r = __copy_from_user(data, (void __user *)ghc->hva, len);
+ r = __copy_from_user(data, (void __user *)ghc->hva + offset, len);
if (r)
return -EFAULT;
return 0;
}
+EXPORT_SYMBOL_GPL(kvm_read_guest_offset_cached);
+
+int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
+ void *data, unsigned long len)
+{
+ return kvm_read_guest_offset_cached(kvm, ghc, data, 0, len);
+}
EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)