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amd64 pmap: preset A and M bits for pmap_qenter() and pmap_kenter() mappings

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This removes one or two atomic update of the pte on access. Also it
makes the pte constant during its lifecycle.

Reviewed by:	alc, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D33778
This commit is contained in:
Konstantin Belousov 2022-01-05 03:25:41 +02:00
parent 720a892ac6
commit 15964f1cb3
1 changed files with 6 additions and 3 deletions
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9
sys/amd64/amd64/pmap.c
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@ -3897,7 +3897,8 @@ pmap_kenter(vm_offset_t va, vm_paddr_t pa)
pt_entry_t *pte;
pte = vtopte(va);
pte_store(pte, pa | X86_PG_RW | X86_PG_V | pg_g | pg_nx);
pte_store(pte, pa | pg_g | pg_nx | X86_PG_A | X86_PG_M |
X86_PG_RW | X86_PG_V);
}
static __inline void
@ -3908,7 +3909,8 @@ pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode)
pte = vtopte(va);
cache_bits = pmap_cache_bits(kernel_pmap, mode, 0);
pte_store(pte, pa | X86_PG_RW | X86_PG_V | pg_g | pg_nx | cache_bits);
pte_store(pte, pa | pg_g | pg_nx | X86_PG_A | X86_PG_M |
X86_PG_RW | X86_PG_V | cache_bits);
}
/*
@ -3967,7 +3969,8 @@ pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count)
pa = VM_PAGE_TO_PHYS(m) | cache_bits;
if ((*pte & (PG_FRAME | X86_PG_PTE_CACHE)) != pa) {
oldpte |= *pte;
pte_store(pte, pa | pg_g | pg_nx | X86_PG_RW | X86_PG_V);
pte_store(pte, pa | pg_g | pg_nx | X86_PG_A |
X86_PG_M | X86_PG_RW | X86_PG_V);
}
pte++;
}