Author: kib
Date: Tue Sep 22 23:28:06 2020
New Revision: 366030
URL: https://svnweb.freebsd.org/changeset/base/366030
Log:
amd64 pmap: More unification for psind = 1 vs 2 in pmap_enter_largepage().
Move
pkru check
wait for page alloc
wire accounting update
asserting allowed updates for valid mappings
out of psind conditions.
Also add assert that psind references supported page size.
Remove not true comment.
Avoid uneccessary page table walks from top level.
Reviewed by: alc, markj (previous version)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26513
Modified:
head/sys/amd64/amd64/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Tue Sep 22 23:27:09 2020 (r366029)
+++ head/sys/amd64/amd64/pmap.c Tue Sep 22 23:28:06 2020 (r366030)
@@ -6479,7 +6479,7 @@ pmap_enter_largepage(pmap_t pmap, vm_offset_t va, pt_e
pt_entry_t origpte, *pml4e, *pdpe, *pde, pten, PG_V;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
- KASSERT(psind > 0 && psind < MAXPAGESIZES,
+ KASSERT(psind > 0 && psind < MAXPAGESIZES && pagesizes[psind] != 0,
("psind %d unexpected", psind));
KASSERT(((newpte & PG_FRAME) & (pagesizes[psind] - 1)) == 0,
("unaligned phys address %#lx newpte %#lx psind %d",
@@ -6494,38 +6494,25 @@ pmap_enter_largepage(pmap_t pmap, vm_offset_t va, pt_e
PG_V = pmap_valid_bit(pmap);
restart:
+ if (!pmap_pkru_same(pmap, va, va + pagesizes[psind]))
+ return (KERN_PROTECTION_FAILURE);
pten = newpte;
if (va < VM_MAXUSER_ADDRESS && pmap->pm_type == PT_X86)
pten |= pmap_pkru_get(pmap, va);
if (psind == 2) { /* 1G */
- if (!pmap_pkru_same(pmap, va, va + NBPDP))
- return (KERN_PROTECTION_FAILURE);
pml4e = pmap_pml4e(pmap, va);
if (pml4e == NULL || (*pml4e & PG_V) == 0) {
mp = _pmap_allocpte(pmap, pmap_pml4e_pindex(va),
NULL, va);
- if (mp == NULL) {
- if ((flags & PMAP_ENTER_NOSLEEP) != 0)
- return (KERN_RESOURCE_SHORTAGE);
- PMAP_UNLOCK(pmap);
- vm_wait(NULL);
- PMAP_LOCK(pmap);
-
- /*
- * Restart at least to recalcuate the pkru
- * key. Our caller must keep the map locked
- * so no paging structure can be validated
- * under us.
- */
- goto restart;
- }
- pdpe = pmap_pdpe(pmap, va);
- KASSERT(pdpe != NULL, ("va %#lx lost pdpe", va));
+ if (mp == NULL)
+ goto allocf;
+ pdpe = (pdp_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(mp));
+ pdpe = &pdpe[pmap_pdpe_index(va)];
origpte = *pdpe;
MPASS(origpte == 0);
} else {
- pdpe = pmap_pdpe(pmap, va);
+ pdpe = pmap_pml4e_to_pdpe(pml4e, va);
KASSERT(pdpe != NULL, ("va %#lx lost pdpe", va));
origpte = *pdpe;
if ((origpte & PG_V) == 0) {
@@ -6533,57 +6520,49 @@ restart:
mp->ref_count++;
}
}
- KASSERT((origpte & PG_V) == 0 || ((origpte & PG_PS) != 0 &&
- (origpte & PG_FRAME) == (pten & PG_FRAME)),
- ("va %#lx changing 1G phys page pdpe %#lx pten %#lx",
- va, origpte, pten));
- if ((pten & PG_W) != 0 && (origpte & PG_W) == 0)
- pmap->pm_stats.wired_count += NBPDP / PAGE_SIZE;
- else if ((pten & PG_W) == 0 && (origpte & PG_W) != 0)
- pmap->pm_stats.wired_count -= NBPDP / PAGE_SIZE;
*pdpe = pten;
} else /* (psind == 1) */ { /* 2M */
- if (!pmap_pkru_same(pmap, va, va + NBPDR))
- return (KERN_PROTECTION_FAILURE);
pde = pmap_pde(pmap, va);
if (pde == NULL) {
mp = _pmap_allocpte(pmap, pmap_pdpe_pindex(va),
NULL, va);
- if (mp == NULL) {
- if ((flags & PMAP_ENTER_NOSLEEP) != 0)
- return (KERN_RESOURCE_SHORTAGE);
- PMAP_UNLOCK(pmap);
- vm_wait(NULL);
- PMAP_LOCK(pmap);
- goto restart;
- }
+ if (mp == NULL)
+ goto allocf;
pde = (pd_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(mp));
pde = &pde[pmap_pde_index(va)];
origpte = *pde;
MPASS(origpte == 0);
} else {
- pdpe = pmap_pdpe(pmap, va);
- MPASS(pdpe != NULL && (*pdpe & PG_V) != 0);
origpte = *pde;
if ((origpte & PG_V) == 0) {
+ pdpe = pmap_pdpe(pmap, va);
+ MPASS(pdpe != NULL && (*pdpe & PG_V) != 0);
mp = PHYS_TO_VM_PAGE(*pdpe & PG_FRAME);
mp->ref_count++;
}
}
- KASSERT((origpte & PG_V) == 0 || ((origpte & PG_PS) != 0 &&
- (origpte & PG_FRAME) == (pten & PG_FRAME)),
- ("va %#lx changing 2M phys page pde %#lx pten %#lx",
- va, origpte, pten));
- if ((pten & PG_W) != 0 && (origpte & PG_W) == 0)
- pmap->pm_stats.wired_count += NBPDR / PAGE_SIZE;
- else if ((pten & PG_W) == 0 && (origpte & PG_W) != 0)
- pmap->pm_stats.wired_count -= NBPDR / PAGE_SIZE;
*pde = pten;
}
+ KASSERT((origpte & PG_V) == 0 || ((origpte & PG_PS) != 0 &&
+ (origpte & PG_PS_FRAME) == (pten & PG_PS_FRAME)),
+ ("va %#lx changing %s phys page origpte %#lx pten %#lx",
+ va, psind == 2 ? "1G" : "2M", origpte, pten));
+ if ((pten & PG_W) != 0 && (origpte & PG_W) == 0)
+ pmap->pm_stats.wired_count += pagesizes[psind] / PAGE_SIZE;
+ else if ((pten & PG_W) == 0 && (origpte & PG_W) != 0)
+ pmap->pm_stats.wired_count -= pagesizes[psind] / PAGE_SIZE;
if ((origpte & PG_V) == 0)
pmap_resident_count_inc(pmap, pagesizes[psind] / PAGE_SIZE);
return (KERN_SUCCESS);
+
+allocf:
+ if ((flags & PMAP_ENTER_NOSLEEP) != 0)
+ return (KERN_RESOURCE_SHORTAGE);
+ PMAP_UNLOCK(pmap);
+ vm_wait(NULL);
+ PMAP_LOCK(pmap);
+ goto restart;
}
/*
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