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amd64: switch pmap_map_io_transient() to use pmap_kenter_attr()
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Browse Source 
instead of constructing transient pte itself.  This pre-set PG_A and
PG_M bits, avoiding atomic pte update on access and modification.  Also
it set the nx bit, the mapping is not supposed to be used for executing.

Reviewed by:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D47717
This commit is contained in:
Konstantin Belousov 2024-11-23 23:03:40 +02:00
parent 2d6923790b
commit 6ec4ff7088
1 changed files with 3 additions and 7 deletions
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10
sys/amd64/amd64/pmap.c
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@ -10518,8 +10518,7 @@ pmap_map_io_transient(vm_page_t page[], vm_offset_t vaddr[], int count,
{
vm_paddr_t paddr;
bool needs_mapping;
pt_entry_t *pte;
int cache_bits, error __unused, i;
int error __unused, i;
/*
* Allocate any KVA space that we need, this is done in a separate
@ -10564,11 +10563,8 @@ pmap_map_io_transient(vm_page_t page[], vm_offset_t vaddr[], int count,
*/
pmap_qenter(vaddr[i], &page[i], 1);
} else {
pte = vtopte(vaddr[i]);
cache_bits = pmap_cache_bits(kernel_pmap,
page[i]->md.pat_mode, false);
pte_store(pte, paddr | X86_PG_RW | X86_PG_V |
cache_bits);
pmap_kenter_attr(vaddr[i], paddr,
page[i]->md.pat_mode);
pmap_invlpg(kernel_pmap, vaddr[i]);
}
}