Add pmap_vm_page_alloc_check()

which is the place to put MD asserts about allocated pages.

On amd64, verify that allocated page does not belong to the kernel
(text, data) or early allocated pages.

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D31121

sys/amd64/include/pmap.h

@@ -456,6 +456,10 @@ extern int invpcid_works;
 #define	pmap_page_is_write_mapped(m)	(((m)->a.flags & PGA_WRITEABLE) != 0)
 #define	pmap_unmapbios(va, sz)		pmap_unmapdev((va), (sz))
 
+#define	pmap_vm_page_alloc_check(m)					\
+	KASSERT(m->phys_addr < kernphys || m->phys_addr >= KERNend,	\
+	    ("allocating kernel page %p", m));
+
 struct thread;
 
 void	pmap_activate_boot(pmap_t pmap);

sys/arm/include/pmap.h

@@ -73,5 +73,7 @@ pmap_vmspace_copy(pmap_t dst_pmap __unused, pmap_t src_pmap __unused)
 
 #define	PMAP_ENTER_QUICK_LOCKED	0x10000000
 
+#define	pmap_vm_page_alloc_check(m)
+
 #endif	/* _KERNEL */
 #endif	/* !_MACHINE_PMAP_H_ */

sys/arm64/include/pmap.h

@@ -162,6 +162,8 @@ extern vm_offset_t virtual_end;
 #define	L1_MAPPABLE_P(va, pa, size)					\
 	((((va) | (pa)) & L1_OFFSET) == 0 && (size) >= L1_SIZE)
 
+#define	pmap_vm_page_alloc_check(m)
+
 void	pmap_activate_vm(pmap_t);
 void	pmap_bootstrap(vm_offset_t, vm_offset_t, vm_paddr_t, vm_size_t);
 int	pmap_change_attr(vm_offset_t va, vm_size_t size, int mode);

sys/i386/include/pmap.h

@@ -238,6 +238,8 @@ pmap_vmspace_copy(pmap_t dst_pmap __unused, pmap_t src_pmap __unused)
 
 struct sf_buf;
 
+#define	pmap_vm_page_alloc_check(m)
+
 /*
  * Only the following functions or macros may be used before pmap_bootstrap()
  * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and

sys/mips/include/pmap.h

@@ -166,6 +166,8 @@ extern vm_offset_t virtual_end;
 #define	pmap_page_is_mapped(m)	(!TAILQ_EMPTY(&(m)->md.pv_list))
 #define	pmap_page_is_write_mapped(m)	(((m)->a.flags & PGA_WRITEABLE) != 0)
 
+#define	pmap_vm_page_alloc_check(m)
+
 void pmap_bootstrap(void);
 void *pmap_mapdev(vm_paddr_t, vm_size_t);
 void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t);

sys/powerpc/include/pmap.h

@@ -301,6 +301,8 @@ extern	struct pmap kernel_pmap_store;
 
 #define	pmap_page_is_write_mapped(m)	(((m)->a.flags & PGA_WRITEABLE) != 0)
 
+#define	pmap_vm_page_alloc_check(m)
+
 void		pmap_bootstrap(vm_offset_t, vm_offset_t);
 void		pmap_kenter(vm_offset_t va, vm_paddr_t pa);
 void		pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, vm_memattr_t);

sys/riscv/include/pmap.h

@@ -139,6 +139,8 @@ extern vm_offset_t virtual_end;
 
 struct thread;
 
+#define	pmap_vm_page_alloc_check(m)
+
 void	pmap_activate_boot(pmap_t);
 void	pmap_activate_sw(struct thread *);
 void	pmap_bootstrap(vm_offset_t, vm_paddr_t, vm_size_t);

sys/vm/vm_page.c

@@ -2416,6 +2416,7 @@ vm_page_alloc_check(vm_page_t m)
 	    ("page %p has unexpected memattr %d",
 	    m, pmap_page_get_memattr(m)));
 	KASSERT(m->valid == 0, ("free page %p is valid", m));
+	pmap_vm_page_alloc_check(m);
 }
 
 /*