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>
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@ -381,6 +381,8 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
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int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
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int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
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unsigned long len);
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unsigned long len);
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int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
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int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
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int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
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void *data, unsigned long len);
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int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
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int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
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int offset, int len);
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int offset, int len);
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int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
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int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
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@ -1418,6 +1418,26 @@ int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
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}
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}
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EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
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EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
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int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
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void *data, unsigned long len)
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{
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struct kvm_memslots *slots = kvm_memslots(kvm);
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int r;
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if (slots->generation != ghc->generation)
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kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
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if (kvm_is_error_hva(ghc->hva))
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return -EFAULT;
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r = __copy_from_user(data, (void __user *)ghc->hva, len);
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if (r)
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return -EFAULT;
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return 0;
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}
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EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
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int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
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int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
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{
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{
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return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
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return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
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