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| author | Marc Zyngier | 2015-03-12 19:16:51 +0100 |
|---|---|---|
| committer | Christoffer Dall | 2015-03-12 22:34:43 +0100 |
| commit | 35307b9a5f7ebcc8d8db41c73b69c131b48ace2b (patch) | |
| tree | 42cf3a7b7177139fe59d764893e0556487b5ba72 /Documentation/virtual/kvm | |
| parent | arm/arm64: KVM: Allow handle_hva_to_gpa to return a value (diff) | |
| download | kernel-qcow2-linux-35307b9a5f7ebcc8d8db41c73b69c131b48ace2b.tar.gz kernel-qcow2-linux-35307b9a5f7ebcc8d8db41c73b69c131b48ace2b.tar.xz kernel-qcow2-linux-35307b9a5f7ebcc8d8db41c73b69c131b48ace2b.zip | |
arm/arm64: KVM: Implement Stage-2 page aging
Until now, KVM/arm didn't care much for page aging (who was swapping
anyway?), and simply provided empty hooks to the core KVM code. With
server-type systems now being available, things are quite different.
This patch implements very simple support for page aging, by clearing
the Access flag in the Stage-2 page tables. On access fault, the current
fault handling will write the PTE or PMD again, putting the Access flag
back on.
It should be possible to implement a much faster handling for Access
faults, but that's left for a later patch.
With this in place, performance in VMs is degraded much more gracefully.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'Documentation/virtual/kvm')
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