KVM: try __get_user_pages_fast even if not in atomic context

}

/*

 * The atomic path to get the writable pfn which will be stored in @pfn,

 * true indicates success, otherwise false is returned.

 * The fast path to get the writable pfn which will be stored in @pfn,

 * true indicates success, otherwise false is returned.  It's also the

 * only part that runs if we can are in atomic context.

 */

static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,

			    bool write_fault, bool *writable, kvm_pfn_t *pfn)

static bool hva_to_pfn_fast(unsigned long addr, bool write_fault,

			    bool *writable, kvm_pfn_t *pfn)

{

	struct page *page[1];

	int npages;

	if (!(async || atomic))

		return false;

	/*

	 * Fast pin a writable pfn only if it is a write fault request

	 * or the caller allows to map a writable pfn for a read fault

	/* we can do it either atomically or asynchronously, not both */

	BUG_ON(atomic && async);

	if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))

	if (hva_to_pfn_fast(addr, write_fault, writable, &pfn))

		return pfn;

	if (atomic)