Re: [PATCH v19 037/130] KVM: TDX: Make KVM_CAP_MAX_VCPUS backend specific

[Huang, Kai]

> Implement the callback for TDX guest to check whether the maximum vCPUs
> passed from usrspace can be supported by TDX, and if it can, override
> Accordingly, in the KVM_CHECK_EXTENSION IOCTL(), change to return the
> 'struct kvm::max_vcpus' for a given VM for the KVM_CAP_MAX_VCPUS.

Sorry some error during copy/paste.  The above should be:

Implement the callback for TDX guest to check whether the maximum vCPUs
passed from usrspace can be supported by TDX, and if it can, override
the 'struct kvm::max_vcpus'.  Leave VMX guests and all AMD guests
unsupported to avoid any side-effect for those VMs.

Accordingly, in the KVM_CHECK_EXTENSION IOCTL(), change to return the
'struct kvm::max_vcpus' for a given VM for the KVM_CAP_MAX_VCPUS.