Re: [PATCH v5 07/10] KVM: xen: allow vcpu_info to be mapped by fixed HVA

[David Woodhouse]

On Fri, 2023-09-22 at 15:00 +0000, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@xxxxxxxxxx>
> 
> If the guest does not explicitly set the GPA of vcpu_info structure in
> memory then, for guests with 32 vCPUs or fewer, the vcpu_info embedded
> in the shared_info page may be used. As described in a previous commit,
> the shared_info page is an overlay at a fixed HVA within the VMM, so in
> this case it also more optimal to activate the vcpu_info cache with a
> fixed HVA to avoid unnecessary invalidation if the guest memory layout
> is modified.
> 
> Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>

Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>

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