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KVM: introduce kvm_read_guest_cached

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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 <[email protected]>
Signed-off-by: Glauber Costa <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Tested-by: Eric Munson <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
This commit is contained in:
Gleb Natapov 2011-07-11 15:28:11 -04:00 • committed by Avi Kivity
commit e03b644fe6
2 changed files with 22 additions and 0 deletions
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20
virt/kvm/kvm_main.c
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@ -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,