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amd64: add pmap_page_set_memattr_noflush()

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Similar to pmap_page_set_memattr() by setting MD page cache attribute
to the argument.  Unlike pmap_page_set_memattr(), does not flush cache
for the direct mapping of the page.

Reviewed by:	alc, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D32318
This commit is contained in:
Konstantin Belousov 2021-10-05 17:12:05 +03:00
parent f8d3368b43
commit 33c17670af
2 changed files with 18 additions and 0 deletions
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17
sys/amd64/amd64/pmap.c
View file

@ -9379,6 +9379,23 @@ pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma)
panic("memory attribute change on the direct map failed");
}
void
pmap_page_set_memattr_noflush(vm_page_t m, vm_memattr_t ma)
{
int error;
m->md.pat_mode = ma;
if ((m->flags & PG_FICTITIOUS) != 0)
return;
PMAP_LOCK(kernel_pmap);
error = pmap_change_props_locked(PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m)),
PAGE_SIZE, PROT_NONE, m->md.pat_mode, 0);
PMAP_UNLOCK(kernel_pmap);
if (error != 0)
panic("memory attribute change on the direct map failed");
}
/*
* Changes the specified virtual address range's memory type to that given by
* the parameter "mode". The specified virtual address range must be

1
sys/amd64/include/pmap.h
View file

@ -499,6 +499,7 @@ void *pmap_mapdev_pciecfg(vm_paddr_t pa, vm_size_t size);
bool pmap_not_in_di(void);
boolean_t pmap_page_is_mapped(vm_page_t m);
void pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma);
void pmap_page_set_memattr_noflush(vm_page_t m, vm_memattr_t ma);
void pmap_pinit_pml4(vm_page_t);
void pmap_pinit_pml5(vm_page_t);
bool pmap_ps_enabled(pmap_t pmap);