214 lines
6.2 KiB
C++
214 lines
6.2 KiB
C++
#ifndef _ASM_X86_XEN_PAGE_H
|
|
#define _ASM_X86_XEN_PAGE_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include <xen/interface/xen.h>
|
|
#include <xen/grant_table.h>
|
|
#include <xen/features.h>
|
|
|
|
/* Xen machine address */
|
|
typedef struct xmaddr {
|
|
phys_addr_t maddr;
|
|
} xmaddr_t;
|
|
|
|
/* Xen pseudo-physical address */
|
|
typedef struct xpaddr {
|
|
phys_addr_t paddr;
|
|
} xpaddr_t;
|
|
|
|
#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
|
|
#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
|
|
|
|
/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
|
|
#define INVALID_P2M_ENTRY (~0UL)
|
|
#define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1))
|
|
#define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2))
|
|
#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
|
|
#define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT)
|
|
|
|
/* Maximum amount of memory we can handle in a domain in pages */
|
|
#define MAX_DOMAIN_PAGES \
|
|
((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE))
|
|
|
|
extern unsigned long *machine_to_phys_mapping;
|
|
extern unsigned long machine_to_phys_nr;
|
|
|
|
extern unsigned long get_phys_to_machine(unsigned long pfn);
|
|
extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
|
|
extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
|
|
extern unsigned long set_phys_range_identity(unsigned long pfn_s,
|
|
unsigned long pfn_e);
|
|
|
|
extern int m2p_add_override(unsigned long mfn, struct page *page,
|
|
struct gnttab_map_grant_ref *kmap_op);
|
|
extern int m2p_remove_override(struct page *page, bool clear_pte);
|
|
extern struct page *m2p_find_override(unsigned long mfn);
|
|
extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn);
|
|
|
|
static inline unsigned long pfn_to_mfn(unsigned long pfn)
|
|
{
|
|
unsigned long mfn;
|
|
|
|
if (xen_feature(XENFEAT_auto_translated_physmap))
|
|
return pfn;
|
|
|
|
mfn = get_phys_to_machine(pfn);
|
|
|
|
if (mfn != INVALID_P2M_ENTRY)
|
|
mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
|
|
|
|
return mfn;
|
|
}
|
|
|
|
static inline int phys_to_machine_mapping_valid(unsigned long pfn)
|
|
{
|
|
if (xen_feature(XENFEAT_auto_translated_physmap))
|
|
return 1;
|
|
|
|
return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY;
|
|
}
|
|
|
|
static inline unsigned long mfn_to_pfn(unsigned long mfn)
|
|
{
|
|
unsigned long pfn;
|
|
int ret = 0;
|
|
|
|
if (xen_feature(XENFEAT_auto_translated_physmap))
|
|
return mfn;
|
|
|
|
if (unlikely(mfn >= machine_to_phys_nr)) {
|
|
pfn = ~0;
|
|
goto try_override;
|
|
}
|
|
pfn = 0;
|
|
/*
|
|
* The array access can fail (e.g., device space beyond end of RAM).
|
|
* In such cases it doesn't matter what we return (we return garbage),
|
|
* but we must handle the fault without crashing!
|
|
*/
|
|
ret = __get_user(pfn, &machine_to_phys_mapping[mfn]);
|
|
try_override:
|
|
/* ret might be < 0 if there are no entries in the m2p for mfn */
|
|
if (ret < 0)
|
|
pfn = ~0;
|
|
else if (get_phys_to_machine(pfn) != mfn)
|
|
/*
|
|
* If this appears to be a foreign mfn (because the pfn
|
|
* doesn't map back to the mfn), then check the local override
|
|
* table to see if there's a better pfn to use.
|
|
*
|
|
* m2p_find_override_pfn returns ~0 if it doesn't find anything.
|
|
*/
|
|
pfn = m2p_find_override_pfn(mfn, ~0);
|
|
|
|
/*
|
|
* pfn is ~0 if there are no entries in the m2p for mfn or if the
|
|
* entry doesn't map back to the mfn and m2p_override doesn't have a
|
|
* valid entry for it.
|
|
*/
|
|
if (pfn == ~0 &&
|
|
get_phys_to_machine(mfn) == IDENTITY_FRAME(mfn))
|
|
pfn = mfn;
|
|
|
|
return pfn;
|
|
}
|
|
|
|
static inline xmaddr_t phys_to_machine(xpaddr_t phys)
|
|
{
|
|
unsigned offset = phys.paddr & ~PAGE_MASK;
|
|
return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
|
|
}
|
|
|
|
static inline xpaddr_t machine_to_phys(xmaddr_t machine)
|
|
{
|
|
unsigned offset = machine.maddr & ~PAGE_MASK;
|
|
return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
|
|
}
|
|
|
|
/*
|
|
* We detect special mappings in one of two ways:
|
|
* 1. If the MFN is an I/O page then Xen will set the m2p entry
|
|
* to be outside our maximum possible pseudophys range.
|
|
* 2. If the MFN belongs to a different domain then we will certainly
|
|
* not have MFN in our p2m table. Conversely, if the page is ours,
|
|
* then we'll have p2m(m2p(MFN))==MFN.
|
|
* If we detect a special mapping then it doesn't have a 'struct page'.
|
|
* We force !pfn_valid() by returning an out-of-range pointer.
|
|
*
|
|
* NB. These checks require that, for any MFN that is not in our reservation,
|
|
* there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
|
|
* we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
|
|
* Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
|
|
*
|
|
* NB2. When deliberately mapping foreign pages into the p2m table, you *must*
|
|
* use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
|
|
* require. In all the cases we care about, the FOREIGN_FRAME bit is
|
|
* masked (e.g., pfn_to_mfn()) so behaviour there is correct.
|
|
*/
|
|
static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
|
|
{
|
|
unsigned long pfn = mfn_to_pfn(mfn);
|
|
if (get_phys_to_machine(pfn) != mfn)
|
|
return -1; /* force !pfn_valid() */
|
|
return pfn;
|
|
}
|
|
|
|
/* VIRT <-> MACHINE conversion */
|
|
#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
|
|
#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
|
|
#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
|
|
#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
|
|
|
|
static inline unsigned long pte_mfn(pte_t pte)
|
|
{
|
|
return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT;
|
|
}
|
|
|
|
static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
|
|
{
|
|
pte_t pte;
|
|
|
|
pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
|
|
massage_pgprot(pgprot);
|
|
|
|
return pte;
|
|
}
|
|
|
|
static inline pteval_t pte_val_ma(pte_t pte)
|
|
{
|
|
return pte.pte;
|
|
}
|
|
|
|
static inline pte_t __pte_ma(pteval_t x)
|
|
{
|
|
return (pte_t) { .pte = x };
|
|
}
|
|
|
|
#define pmd_val_ma(v) ((v).pmd)
|
|
#ifdef __PAGETABLE_PUD_FOLDED
|
|
#define pud_val_ma(v) ((v).pgd.pgd)
|
|
#else
|
|
#define pud_val_ma(v) ((v).pud)
|
|
#endif
|
|
#define __pmd_ma(x) ((pmd_t) { (x) } )
|
|
|
|
#define pgd_val_ma(x) ((x).pgd)
|
|
|
|
void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
|
|
|
|
xmaddr_t arbitrary_virt_to_machine(void *address);
|
|
unsigned long arbitrary_virt_to_mfn(void *vaddr);
|
|
void make_lowmem_page_readonly(void *vaddr);
|
|
void make_lowmem_page_readwrite(void *vaddr);
|
|
|
|
#endif /* _ASM_X86_XEN_PAGE_H */
|