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The .change_pte() MMU notifier callback was intended as an
optimization. The original point of it was that KSM could tell KVM to flip
its secondary PTE to a new location without having to first zap it. At
the time there was also an .invalidate_page() callback; both of them were
*not* bracketed by calls to mmu_notifier_invalidate_range_{start,end}(),
and .invalidate_page() also doubled as a fallback implementation of
.change_pte().
Later on, however, both callbacks were changed to occur within an
invalidate_range_start/end() block.
In the case of .change_pte(), commit
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.. | ||
async_pf.c | ||
async_pf.h | ||
binary_stats.c | ||
coalesced_mmio.c | ||
coalesced_mmio.h | ||
dirty_ring.c | ||
eventfd.c | ||
guest_memfd.c | ||
irqchip.c | ||
Kconfig | ||
kvm_main.c | ||
kvm_mm.h | ||
Makefile.kvm | ||
pfncache.c | ||
vfio.c | ||
vfio.h |