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Set PTE_A and PTE_D for user mappings in pmap_enter().

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This assumes that an access according to the prot in 'flags' triggered
a fault and is going to be retried after the fault returns, so the two
flags are set preemptively to avoid refaulting on the retry.

While here, only bother setting PTE_D for kernel mappings in pmap_enter
for writable mappings.

Reviewed by:	markj
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D17782
This commit is contained in:
John Baldwin 2018-11-01 22:17:51 +00:00
parent a751b25546
commit 6f888020df
1 changed files with 5 additions and 3 deletions
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8
sys/riscv/riscv/pmap.c
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@ -2088,13 +2088,15 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
pa = VM_PAGE_TO_PHYS(m);
pn = (pa / PAGE_SIZE);
new_l3 = PTE_V | PTE_R | PTE_X;
new_l3 = PTE_V | PTE_R | PTE_X | PTE_A;
if (flags & VM_PROT_WRITE)
new_l3 |= PTE_D;
if (prot & VM_PROT_WRITE)
new_l3 |= PTE_W;
if ((va >> 63) == 0)
new_l3 |= PTE_U;
else
new_l3 |= PTE_A | PTE_D;
else if (prot & VM_PROT_WRITE)
new_l3 |= PTE_D;
new_l3 |= (pn << PTE_PPN0_S);
if ((flags & PMAP_ENTER_WIRED) != 0)