On 07/06/2010 01:48 PM, Xiao Guangrong wrote:
This function not only return the gfn's page but also the page number
after @gfn in the slot
@@ -923,15 +923,25 @@ static unsigned long gfn_to_hva_memslot(struct
kvm_memory_slot *slot, gfn_t gfn)
return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
}
-unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
+static unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn, int *entry)
{
'entry' better be gfn_t. We limit gfns in a slot, but that's
artificial, let's use the correct type.
Also suggest nr_pages as the name.
@@ -1011,6 +1021,23 @@ pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
return hva_to_pfn(kvm, addr, false);
}
+int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn,
+ struct page **pages, int nr_pages, bool *enough)
+{
+ unsigned long addr;
+ int entry, ret;
+
+ addr = gfn_to_hva_many(kvm, gfn,&entry);
+ if (kvm_is_error_hva(addr))
+ return -1;
+
+ entry = min(entry, nr_pages);
+ *enough = (entry == nr_pages) ? true : false;
s/ ? true : false//; :)
Why not return 0 if !enough?
+ ret = __get_user_pages_fast(addr, entry, 1, pages);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
+
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
pfn_t pfn;
--
error compiling committee.c: too many arguments to function
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