memory.h

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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __KVM_HYP_MEMORY_H
#define __KVM_HYP_MEMORY_H
 
#include <asm/kvm_mmu.h>
#include <asm/page.h>
 
#include <linux/types.h>
 
struct hyp_page {
    unsigned short refcount;
    unsigned short order;
};
 
extern u64 __hyp_vmemmap;
#define hyp_vmemmap ((struct hyp_page *)__hyp_vmemmap)
 
#define __hyp_va(phys)  ((void *)((phys_addr_t)(phys) - hyp_physvirt_offset))
 
static inline void *hyp_phys_to_virt(phys_addr_t phys)
{
    return __hyp_va(phys);
}
 
static inline phys_addr_t hyp_virt_to_phys(void *addr)
{
    return __hyp_pa(addr);
}
 
#define hyp_phys_to_pfn(phys)   ((phys) >> PAGE_SHIFT)
#define hyp_pfn_to_phys(pfn)    ((phys_addr_t)((pfn) << PAGE_SHIFT))
#define hyp_phys_to_page(phys)  (&hyp_vmemmap[hyp_phys_to_pfn(phys)])
#define hyp_virt_to_page(virt)  hyp_phys_to_page(__hyp_pa(virt))
#define hyp_virt_to_pfn(virt)   hyp_phys_to_pfn(__hyp_pa(virt))
 
#define hyp_page_to_pfn(page)   ((struct hyp_page *)(page) - hyp_vmemmap)
#define hyp_page_to_phys(page)  hyp_pfn_to_phys((hyp_page_to_pfn(page)))
#define hyp_page_to_virt(page)  __hyp_va(hyp_page_to_phys(page))
#define hyp_page_to_pool(page)  (((struct hyp_page *)page)->pool)
 
/*
 * Refcounting for 'struct hyp_page'.
 * hyp_pool::lock must be held if atomic access to the refcount is required.
 */
static inline int hyp_page_count(void *addr)
{
    struct hyp_page *p = hyp_virt_to_page(addr);
 
    return p->refcount;
}
 
static inline void hyp_page_ref_inc(struct hyp_page *p)
{
    BUG_ON(p->refcount == USHRT_MAX);
    p->refcount++;
}
 
static inline void hyp_page_ref_dec(struct hyp_page *p)
{
    BUG_ON(!p->refcount);
    p->refcount--;
}
 
static inline int hyp_page_ref_dec_and_test(struct hyp_page *p)
{
    hyp_page_ref_dec(p);
    return (p->refcount == 0);
}
 
static inline void hyp_set_page_refcounted(struct hyp_page *p)
{
    BUG_ON(p->refcount);
    p->refcount = 1;
}
#endif /* __KVM_HYP_MEMORY_H */