Will Deacon
authored
stage2_pte_cacheable() tries to figure out whether the mapping installed in its 'pte' parameter is cacheable or not. Unfortunately, it fails miserably because it extracts the memory attributes from the entry using FIELD_GET(), which returns the attributes shifted down to bit 0, but then compares this with the unshifted value generated by the PAGE_S2_MEMATTR() macro. A direct consequence of this bug is that cache maintenance is silently skipped, which in turn causes 32-bit guests to crash early on when their set/way maintenance is trapped but not emulated correctly. Fix the broken masks by avoiding the use of FIELD_GET() altogether. Fixes: 6d9d2115 ("KVM: arm64: Add support for stage-2 map()/unmap() in generic page-table") Reported-by:Marc Zyngier <maz@kernel.org> Signed-off-by:
Will Deacon <will@kernel.org> Signed-off-by:
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