Re: [PATCH 8/8] KVM: xen: automatically use the vcpu_info embedded in shared_info

[David Woodhouse]

On Thu, 2023-09-14 at 08:49 +0000, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@xxxxxxxxxx>
> 
> Add a KVM_XEN_HVM_CONFIG_DEFAULT_VCPU_INFO flag so that the VMM knows it
> need only set the KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO attribute in response to
> a VCPUOP_register_vcpu_info hypercall, and modify get_vcpu_info_cache()
> to pass back a pointer to the shared info pfn cache (and appropriate
> offset) for any of the first 32 vCPUs if the attribute has not been set.

Might be simpler just to link this behaviour to the
KVM_XEN_ATTR_TYPE_SHARED_INFO_HVA support? If userspace sets the
shared_info as an HVA, then the default vcpu_info will be used therein.

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