KVM: let the error pfn not depend on error code

#define KVM_MAX_MMIO_FRAGMENTS \

	(KVM_MMIO_SIZE / KVM_USER_MMIO_SIZE + KVM_EXTRA_MMIO_FRAGMENTS)

#define KVM_PFN_ERR_FAULT	(-EFAULT)

#define KVM_PFN_ERR_HWPOISON	(-EHWPOISON)

#define KVM_PFN_ERR_BAD		(-ENOENT)

/*

 * For the normal pfn, the highest 12 bits should be zero,

 * so we can mask these bits to indicate the error.

 */

#define KVM_PFN_ERR_MASK	(0xfffULL << 52)

#define KVM_PFN_ERR_FAULT	(KVM_PFN_ERR_MASK)

#define KVM_PFN_ERR_HWPOISON	(KVM_PFN_ERR_MASK + 1)

#define KVM_PFN_ERR_BAD		(KVM_PFN_ERR_MASK + 2)

static inline int is_error_pfn(pfn_t pfn)

static inline bool is_error_pfn(pfn_t pfn)

{

	return IS_ERR_VALUE(pfn);

	return !!(pfn & KVM_PFN_ERR_MASK);

}

static inline int is_noslot_pfn(pfn_t pfn)

static inline bool is_noslot_pfn(pfn_t pfn)

{

	return pfn == -ENOENT;

	return pfn == KVM_PFN_ERR_BAD;

}

static inline int is_invalid_pfn(pfn_t pfn)

static inline bool is_invalid_pfn(pfn_t pfn)

{

	return !is_noslot_pfn(pfn) && is_error_pfn(pfn);

}

#define KVM_ERR_PTR_BAD_PAGE	(ERR_PTR(-ENOENT))

static inline int is_error_page(struct page *page)

static inline bool is_error_page(struct page *page)

{

	return IS_ERR(page);

}