Date: Fri, 25 Sep 2020 13:59:50 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r366158 - stable/12/sys/arm64/arm64 Message-ID: <202009251359.08PDxohT034847@repo.freebsd.org>
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Author: markj Date: Fri Sep 25 13:59:50 2020 New Revision: 366158 URL: https://svnweb.freebsd.org/changeset/base/366158 Log: MFC r365879, r365976: Assert we are not traversing through superpages in the arm64 pmap. Modified: stable/12/sys/arm64/arm64/pmap.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/arm64/arm64/pmap.c ============================================================================== --- stable/12/sys/arm64/arm64/pmap.c Fri Sep 25 13:53:32 2020 (r366157) +++ stable/12/sys/arm64/arm64/pmap.c Fri Sep 25 13:59:50 2020 (r366158) @@ -373,12 +373,22 @@ pmap_l1(pmap_t pmap, vm_offset_t va) } static __inline pd_entry_t * -pmap_l1_to_l2(pd_entry_t *l1, vm_offset_t va) +pmap_l1_to_l2(pd_entry_t *l1p, vm_offset_t va) { - pd_entry_t *l2; + pd_entry_t l1, *l2p; - l2 = (pd_entry_t *)PHYS_TO_DMAP(pmap_load(l1) & ~ATTR_MASK); - return (&l2[pmap_l2_index(va)]); + l1 = pmap_load(l1p); + + /* + * The valid bit may be clear if pmap_update_entry() is concurrently + * modifying the entry, so for KVA only the entry type may be checked. + */ + KASSERT(va >= VM_MAX_USER_ADDRESS || (l1 & ATTR_DESCR_VALID) != 0, + ("%s: L1 entry %#lx for %#lx is invalid", __func__, l1, va)); + KASSERT((l1 & ATTR_DESCR_TYPE_MASK) == ATTR_DESCR_TYPE_TABLE, + ("%s: L1 entry %#lx for %#lx is a leaf", __func__, l1, va)); + l2p = (pd_entry_t *)PHYS_TO_DMAP(l1 & ~ATTR_MASK); + return (&l2p[pmap_l2_index(va)]); } static __inline pd_entry_t * @@ -394,12 +404,23 @@ pmap_l2(pmap_t pmap, vm_offset_t va) } static __inline pt_entry_t * -pmap_l2_to_l3(pd_entry_t *l2, vm_offset_t va) +pmap_l2_to_l3(pd_entry_t *l2p, vm_offset_t va) { - pt_entry_t *l3; + pd_entry_t l2; + pt_entry_t *l3p; - l3 = (pd_entry_t *)PHYS_TO_DMAP(pmap_load(l2) & ~ATTR_MASK); - return (&l3[pmap_l3_index(va)]); + l2 = pmap_load(l2p); + + /* + * The valid bit may be clear if pmap_update_entry() is concurrently + * modifying the entry, so for KVA only the entry type may be checked. + */ + KASSERT(va >= VM_MAX_USER_ADDRESS || (l2 & ATTR_DESCR_VALID) != 0, + ("%s: L2 entry %#lx for %#lx is invalid", __func__, l2, va)); + KASSERT((l2 & ATTR_DESCR_TYPE_MASK) == ATTR_DESCR_TYPE_TABLE, + ("%s: L2 entry %#lx for %#lx is a leaf", __func__, l2, va)); + l3p = (pt_entry_t *)PHYS_TO_DMAP(l2 & ~ATTR_MASK); + return (&l3p[pmap_l3_index(va)]); } /*
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