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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