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arm64: Add a leaf PTP when pmap_enter(psind=1) creates a wired mapping
Let pmap_enter_l2() create wired mappings. In particular, allocate a
leaf PTP for use during demotion. This is a step towards reverting
commit 64087fd7f3
.
Reviewed by: alc, markj
Sponsored by: Google, Inc. (GSoC 2023)
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D41634
This commit is contained in:
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6c1d6d4c7f
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@ -4797,6 +4797,7 @@ pmap_enter_l2(pmap_t pmap, vm_offset_t va, pd_entry_t new_l2, u_int flags,
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struct spglist free;
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pd_entry_t *l2, old_l2;
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vm_page_t l2pg, mt;
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vm_page_t uwptpg;
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PMAP_LOCK_ASSERT(pmap, MA_OWNED);
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KASSERT(ADDR_IS_CANONICAL(va),
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@ -4864,6 +4865,24 @@ pmap_enter_l2(pmap_t pmap, vm_offset_t va, pd_entry_t new_l2, u_int flags,
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}
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}
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/*
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* Allocate leaf ptpage for wired userspace pages.
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*/
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uwptpg = NULL;
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if ((new_l2 & ATTR_SW_WIRED) != 0 && pmap != kernel_pmap) {
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uwptpg = vm_page_alloc_noobj(VM_ALLOC_WIRED);
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if (uwptpg == NULL) {
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return (KERN_RESOURCE_SHORTAGE);
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}
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uwptpg->pindex = pmap_l2_pindex(va);
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if (pmap_insert_pt_page(pmap, uwptpg, true, false)) {
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vm_page_unwire_noq(uwptpg);
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vm_page_free(uwptpg);
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return (KERN_RESOURCE_SHORTAGE);
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}
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pmap_resident_count_inc(pmap, 1);
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uwptpg->ref_count = NL3PG;
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}
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if ((new_l2 & ATTR_SW_MANAGED) != 0) {
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/*
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* Abort this mapping if its PV entry could not be created.
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@ -4871,6 +4890,16 @@ pmap_enter_l2(pmap_t pmap, vm_offset_t va, pd_entry_t new_l2, u_int flags,
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if (!pmap_pv_insert_l2(pmap, va, new_l2, flags, lockp)) {
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if (l2pg != NULL)
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pmap_abort_ptp(pmap, va, l2pg);
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if (uwptpg != NULL) {
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mt = pmap_remove_pt_page(pmap, va);
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KASSERT(mt == uwptpg,
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("removed pt page %p, expected %p", mt,
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uwptpg));
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pmap_resident_count_dec(pmap, 1);
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uwptpg->ref_count = 1;
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vm_page_unwire_noq(uwptpg);
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vm_page_free(uwptpg);
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}
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CTR2(KTR_PMAP,
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"pmap_enter_l2: failure for va %#lx in pmap %p",
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va, pmap);
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