Date: Wed, 29 Dec 2021 10:16:49 GMT From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 28e0603813cd - stable/13 - Don't fail changing props for unmapped DMAP memory Message-ID: <202112291016.1BTAGn1W061135@gitrepo.freebsd.org>
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The branch stable/13 has been updated by andrew: URL: https://cgit.FreeBSD.org/src/commit/?id=28e0603813cd8584045bcdeae061e1a333b4e134 commit 28e0603813cd8584045bcdeae061e1a333b4e134 Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2021-12-14 18:09:47 +0000 Commit: Andrew Turner <andrew@FreeBSD.org> CommitDate: 2021-12-29 10:05:14 +0000 Don't fail changing props for unmapped DMAP memory When recursing in pmap_change_props_locked we may fail because there is no pte. This shouldn't be considered a fail as it may happen in a few cases, e.g. there are multiple normal memory ranges with device memory between them. Reported by: cperciva Tested by: cperciva Reviewed by: alc, kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D33459 (cherry picked from commit 69cfbd669e34aaaa49f4caed49bd7df93d4115b2) --- sys/arm64/arm64/pmap.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c index 793126fcf58d..6eab5fa5ecd9 100644 --- a/sys/arm64/arm64/pmap.c +++ b/sys/arm64/arm64/pmap.c @@ -383,7 +383,7 @@ static void pmap_abort_ptp(pmap_t pmap, vm_offset_t va, vm_page_t mpte); static bool pmap_activate_int(pmap_t pmap); static void pmap_alloc_asid(pmap_t pmap); static int pmap_change_props_locked(vm_offset_t va, vm_size_t size, - vm_prot_t prot, int mode); + vm_prot_t prot, int mode, bool skip_unmapped); static pt_entry_t *pmap_demote_l1(pmap_t pmap, pt_entry_t *l1, vm_offset_t va); static pt_entry_t *pmap_demote_l2_locked(pmap_t pmap, pt_entry_t *l2, vm_offset_t va, struct rwlock **lockp); @@ -6115,7 +6115,7 @@ pmap_change_attr(vm_offset_t va, vm_size_t size, int mode) int error; PMAP_LOCK(kernel_pmap); - error = pmap_change_props_locked(va, size, PROT_NONE, mode); + error = pmap_change_props_locked(va, size, PROT_NONE, mode, false); PMAP_UNLOCK(kernel_pmap); return (error); } @@ -6137,14 +6137,14 @@ pmap_change_prot(vm_offset_t va, vm_size_t size, vm_prot_t prot) return (EINVAL); PMAP_LOCK(kernel_pmap); - error = pmap_change_props_locked(va, size, prot, -1); + error = pmap_change_props_locked(va, size, prot, -1, false); PMAP_UNLOCK(kernel_pmap); return (error); } static int pmap_change_props_locked(vm_offset_t va, vm_size_t size, vm_prot_t prot, - int mode) + int mode, bool skip_unmapped) { vm_offset_t base, offset, tmpva; vm_size_t pte_size; @@ -6196,13 +6196,14 @@ pmap_change_props_locked(vm_offset_t va, vm_size_t size, vm_prot_t prot, for (tmpva = base; tmpva < base + size; ) { ptep = pmap_pte(kernel_pmap, tmpva, &lvl); - if (ptep == NULL) + if (ptep == NULL && !skip_unmapped) { return (EINVAL); - - if ((pmap_load(ptep) & mask) == bits) { + } else if ((ptep == NULL && skip_unmapped) || + (pmap_load(ptep) & mask) == bits) { /* - * We already have the correct attribute, - * ignore this entry. + * We already have the correct attribute or there + * is no memory mapped at this address and we are + * skipping unmapped memory. */ switch (lvl) { default: @@ -6269,7 +6270,7 @@ pmap_change_props_locked(vm_offset_t va, vm_size_t size, vm_prot_t prot, */ rv = pmap_change_props_locked( PHYS_TO_DMAP(pa), pte_size, - prot, mode); + prot, mode, true); if (rv != 0) return (rv); }
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