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Fix error in r233949. Synchronizing icaches on uncacheable pages turns out

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not to be a good idea, and of course the PV entry list for a page is never
empty after the page has been mapped.
This commit is contained in:
Nathan Whitehorn 2012-04-11 20:28:05 +00:00
parent c85cb1a0a2
commit 805bee55eb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=234149
1 changed files with 4 additions and 2 deletions
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6
sys/powerpc/aim/mmu_oea.c
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@ -1137,9 +1137,11 @@ moea_enter_locked(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
/*
* Flush the real page from the instruction cache. This has be done
* for all user mappings to prevent information leakage via the
* instruction cache.
* instruction cache. moea_pvo_enter() returns ENOENT for the first
* mapping for a page.
*/
if (pmap != kernel_pmap && LIST_EMPTY(vm_page_to_pvoh(m)))
if (pmap != kernel_pmap && error == ENOENT &&
(pte_lo & (PTE_I | PTE_G)) == 0)
moea_syncicache(VM_PAGE_TO_PHYS(m), PAGE_SIZE);
}