Re: [PATCH v7 4/9] KVM: Support dirty ring in conjunction with bitmap

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On Mon, Oct 31, 2022 at 08:36:16AM +0800, Gavin Shan wrote:
> ARM64 needs to dirty memory outside of a VCPU context when VGIC/ITS is
> enabled. It's conflicting with that ring-based dirty page tracking always
> requires a running VCPU context.
> 
> Introduce a new flavor of dirty ring that requires the use of both VCPU
> dirty rings and a dirty bitmap. The expectation is that for non-VCPU
> sources of dirty memory (such as the VGIC/ITS on arm64), KVM writes to
> the dirty bitmap. Userspace should scan the dirty bitmap before migrating
> the VM to the target.
> 
> Use an additional capability to advertise this behavior. The newly added
> capability (KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP) can't be enabled before
> KVM_CAP_DIRTY_LOG_RING_ACQ_REL on ARM64. In this way, the newly added
> capability is treated as an extension of KVM_CAP_DIRTY_LOG_RING_ACQ_REL.
> 
> Suggested-by: Marc Zyngier <maz@xxxxxxxxxx>
> Suggested-by: Peter Xu <peterx@xxxxxxxxxx>
> Co-developed-by: Oliver Upton <oliver.upton@xxxxxxxxx>
> Signed-off-by: Oliver Upton <oliver.upton@xxxxxxxxx>
> Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>

Acked-by: Peter Xu <peterx@xxxxxxxxxx>

-- 
Peter Xu




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