[PATCH v13 22/35] KVM: Allow arch code to track number of memslot address spaces per VM

[Paolo Bonzini]

On 10/27/23 20:22, Sean Christopherson wrote:
> Let x86 track the number of address spaces on a per-VM basis so that KVM
> can disallow SMM memslots for confidential VMs.  Confidentials VMs are
> fundamentally incompatible with emulating SMM, which as the name suggests
> requires being able to read and write guest memory and register state.
> 
> Disallowing SMM will simplify support for guest private memory, as KVM
> will not need to worry about tracking memory attributes for multiple
> address spaces (SMM is the only "non-default" address space across all
> architectures).

Reviewed-by: Paolo Bonzini <pbonzini at redhat.com>