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| author | Oliver Upton <oliver.upton@linux.dev> | 2024-10-08 01:30:27 +0200 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2024-10-08 11:40:27 +0200 |
| commit | c268f204f7c5784e84583c1c44d427bac09f517a (patch) | |
| tree | 10b75651a487bf8ad69cb263cc1b47c0515b22cc /arch/arm64/kvm/sys_regs.c | |
| parent | KVM: arm64: nv: Do not block when unmapping stage-2 if disallowed (diff) | |
| download | linux-c268f204f7c5784e84583c1c44d427bac09f517a.tar.xz linux-c268f204f7c5784e84583c1c44d427bac09f517a.zip | |
KVM: arm64: nv: Punt stage-2 recycling to a vCPU request
Currently, when a nested MMU is repurposed for some other MMU context,
KVM unmaps everything during vcpu_load() while holding the MMU lock for
write. This is quite a performance bottleneck for large nested VMs, as
all vCPU scheduling will spin until the unmap completes.
Start punting the MMU cleanup to a vCPU request, where it is then
possible to periodically release the MMU lock and CPU in the presence of
contention.
Ensure that no vCPU winds up using a stale MMU by tracking the pending
unmap on the S2 MMU itself and requesting an unmap on every vCPU that
finds it.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241007233028.2236133-4-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
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