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#ifndef _XEN_P2M_H
#define _XEN_P2M_H
#include <xen/mm.h>
struct domain;
/* Per-p2m-table state */
struct p2m_domain {
/* Lock that protects updates to the p2m */
spinlock_t lock;
/* Pages used to construct the p2m */
struct page_list_head pages;
/* Root of p2m page tables, 2 contiguous pages */
struct page_info *first_level;
/* Current VMID in use */
uint8_t vmid;
};
/* Initialise vmid allocator */
void p2m_vmid_allocator_init(void);
/* Init the datastructures for later use by the p2m code */
int p2m_init(struct domain *d);
/* Return all the p2m resources to Xen. */
void p2m_teardown(struct domain *d);
/* Allocate a new p2m table for a domain.
*
* Returns 0 for success or -errno.
*/
int p2m_alloc_table(struct domain *d);
/* */
void p2m_load_VTTBR(struct domain *d);
/* Look up the MFN corresponding to a domain's PFN. */
paddr_t p2m_lookup(struct domain *d, paddr_t gpfn);
/* Setup p2m RAM mapping for domain d from start-end. */
int p2m_populate_ram(struct domain *d, paddr_t start, paddr_t end);
/* Map MMIO regions in the p2m: start_gaddr and end_gaddr is the range
* in the guest physical address space to map, starting from the machine
* address maddr. */
int map_mmio_regions(struct domain *d, paddr_t start_gaddr,
paddr_t end_gaddr, paddr_t maddr);
/* Untyped version for RAM only, for compatibility */
int guest_physmap_add_page(struct domain *d,
unsigned long gfn,
unsigned long mfn,
unsigned int page_order);
void guest_physmap_remove_page(struct domain *d,
unsigned long gpfn,
unsigned long mfn, unsigned int page_order);
unsigned long gmfn_to_mfn(struct domain *d, unsigned long gpfn);
/*
* Populate-on-demand
*/
/* Call when decreasing memory reservation to handle PoD entries properly.
* Will return '1' if all entries were handled and nothing more need be done.*/
int
p2m_pod_decrease_reservation(struct domain *d,
xen_pfn_t gpfn,
unsigned int order);
/* Look up a GFN and take a reference count on the backing page. */
typedef int p2m_type_t;
typedef unsigned int p2m_query_t;
#define P2M_ALLOC (1u<<0) /* Populate PoD and paged-out entries */
#define P2M_UNSHARE (1u<<1) /* Break CoW sharing */
static inline struct page_info *get_page_from_gfn(
struct domain *d, unsigned long gfn, p2m_type_t *t, p2m_query_t q)
{
struct page_info *page;
unsigned long mfn = gmfn_to_mfn(d, gfn);
ASSERT(t == NULL);
if (!mfn_valid(mfn))
return NULL;
page = mfn_to_page(mfn);
if ( !get_page(page, d) )
return NULL;
return page;
}
int get_page_type(struct page_info *page, unsigned long type);
int is_iomem_page(unsigned long mfn);
static inline int get_page_and_type(struct page_info *page,
struct domain *domain,
unsigned long type)
{
int rc = get_page(page, domain);
if ( likely(rc) && unlikely(!get_page_type(page, type)) )
{
put_page(page);
rc = 0;
}
return rc;
}
#endif /* _XEN_P2M_H */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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