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0df4f266b3
Based on include/xen/mm.h [1], Linux is mistakenly using MFN when GFN is meant, I suspect this is because the first support for Xen was for PV. This resulted in some misimplementation of helpers on ARM and confused developers about the expected behavior. For instance, with pfn_to_mfn, we expect to get an MFN based on the name. Although, if we look at the implementation on x86, it's returning a GFN. For clarity and avoid new confusion, replace any reference to mfn with gfn in any helpers used by PV drivers. The x86 code will still keep some reference of pfn_to_mfn which may be used by all kind of guests No changes as been made in the hypercall field, even though they may be invalid, in order to keep the same as the defintion in xen repo. Note that page_to_mfn has been renamed to xen_page_to_gfn to avoid a name to close to the KVM function gfn_to_page. Take also the opportunity to simplify simple construction such as pfn_to_mfn(page_to_pfn(page)) into xen_page_to_gfn. More complex clean up will come in follow-up patches. [1] http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=e758ed14f390342513405dd766e874934573e6cb Signed-off-by: Julien Grall <julien.grall@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
#ifndef _ASM_ARM_XEN_PAGE_H
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#define _ASM_ARM_XEN_PAGE_H
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <linux/pfn.h>
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <xen/xen.h>
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#include <xen/interface/grant_table.h>
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#define phys_to_machine_mapping_valid(pfn) (1)
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#define pte_mfn pte_pfn
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#define mfn_pte pfn_pte
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/* Xen machine address */
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typedef struct xmaddr {
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phys_addr_t maddr;
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} xmaddr_t;
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/* Xen pseudo-physical address */
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typedef struct xpaddr {
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phys_addr_t paddr;
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} xpaddr_t;
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#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
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#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
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#define INVALID_P2M_ENTRY (~0UL)
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unsigned long __pfn_to_mfn(unsigned long pfn);
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extern struct rb_root phys_to_mach;
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/* Pseudo-physical <-> Guest conversion */
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static inline unsigned long pfn_to_gfn(unsigned long pfn)
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{
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return pfn;
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}
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static inline unsigned long gfn_to_pfn(unsigned long gfn)
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{
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return gfn;
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}
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/* Pseudo-physical <-> BUS conversion */
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static inline unsigned long pfn_to_bfn(unsigned long pfn)
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{
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unsigned long mfn;
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if (phys_to_mach.rb_node != NULL) {
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mfn = __pfn_to_mfn(pfn);
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if (mfn != INVALID_P2M_ENTRY)
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return mfn;
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}
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return pfn;
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}
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static inline unsigned long bfn_to_pfn(unsigned long bfn)
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{
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return bfn;
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}
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#define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn)
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/* VIRT <-> GUEST conversion */
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#define virt_to_gfn(v) (pfn_to_gfn(virt_to_pfn(v)))
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#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << PAGE_SHIFT))
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/* Only used in PV code. But ARM guests are always HVM. */
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static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
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{
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BUG();
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}
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/* TODO: this shouldn't be here but it is because the frontend drivers
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* are using it (its rolled in headers) even though we won't hit the code path.
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* So for right now just punt with this.
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*/
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static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
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{
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BUG();
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return NULL;
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}
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extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
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struct gnttab_map_grant_ref *kmap_ops,
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struct page **pages, unsigned int count);
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extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
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struct gnttab_unmap_grant_ref *kunmap_ops,
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struct page **pages, unsigned int count);
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bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
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bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
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unsigned long nr_pages);
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static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
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{
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return __set_phys_to_machine(pfn, mfn);
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}
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#define xen_remap(cookie, size) ioremap_cache((cookie), (size))
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#define xen_unmap(cookie) iounmap((cookie))
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bool xen_arch_need_swiotlb(struct device *dev,
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unsigned long pfn,
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unsigned long bfn);
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unsigned long xen_get_swiotlb_free_pages(unsigned int order);
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#endif /* _ASM_ARM_XEN_PAGE_H */
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