[PATCH v4 25/28] KVM: TDX: Don't copy "cmd" back to userspace for KVM_TDX_CAPABILITIES

[Huang, Kai]

On Thu, 2025-10-30 at 13:09 -0700, Sean Christopherson wrote:
> Don't copy the kvm_tdx_cmd structure back to userspace when handling
> KVM_TDX_CAPABILITIES, as tdx_get_capabilities() doesn't modify hw_error or
> any other fields.
> 
> Opportunistically hoist the call to tdx_get_capabilities() outside of the
> kvm->lock critical section, as getting the capabilities doesn't touch the
> VM in any way, e.g. doesn't even take @kvm.
> 
> Suggested-by: Kai Huang <kai.huang at intel.com>
> Signed-off-by: Sean Christopherson <seanjc at google.com>

Reviewed-by: Kai Huang <kai.huang at intel.com>