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KVM: arm64: Delay the polling of the GICR_VPENDBASER.Dirty bit

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In order to reduce the impact of the VPT parsing happening on the GIC,
we can split the vcpu reseidency in two phases:

- programming GICR_VPENDBASER: this still happens in vcpu_load()
- checking for the VPT parsing to be complete: this can happen
  on vcpu entry (in kvm_vgic_flush_hwstate())

This allows the GIC and the CPU to work in parallel, rewmoving some
of the entry overhead.

Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Shenming Lu <lushenming@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201128141857.983-3-lushenming@huawei.com
This commit is contained in:
Shenming Lu 2020-11-28 22:18:57 +08:00 • committed by Marc Zyngier
commit 57e3cebd02
6 changed files with 47 additions and 4 deletions
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