Re: [PULL v4 13/43] vl: Add sgx compound properties to expose SGX EPC sections to guest

[Eric Blake <eblake@redhat.com>]

On Wed, Sep 08, 2021 at 12:03:56PM +0200, Paolo Bonzini wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
> 
> Because SGX EPC is enumerated through CPUID, EPC "devices" need to be
> realized prior to realizing the vCPUs themselves, i.e. long before
> generic devices are parsed and realized.  From a virtualization
> perspective, the CPUID aspect also means that EPC sections cannot be
> hotplugged without paravirtualizing the guest kernel (hardware does
> not support hotplugging as EPC sections must be locked down during
> pre-boot to provide EPC's security properties).
> 

>  qapi/machine.json         | 26 +++++++++++++++
>  qemu-options.hx           | 10 ++++--
>  9 files changed, 166 insertions(+), 8 deletions(-)
>  create mode 100644 hw/i386/sgx.c
...
> +++ b/qapi/machine.json
> @@ -1194,6 +1194,32 @@
>            }
>  }
>  
> +##
> +# @SgxEPC:
> +#
> +# Sgx EPC cmdline information
> +#
> +# @memdev: memory backend linked with device
> +#
> +# Since: 6.1

Another instance where we'll want the followup patch to correct things
to 6.2.

> +##
> +{ 'struct': 'SgxEPC',
> +  'data': { 'memdev': 'str' }
> +}
> +
> +##
> +# @SgxEPCProperties:
> +#
> +# Properties for SgxEPC objects.
> +#
> +# @sgx-epc: sgx epc section properties.
> +#
> +# Since: 6.1
> +##
> +{ 'struct': 'SgxEPCProperties',
> +  'data': { 'sgx-epc': ['SgxEPC'] }
> +}
> +
>  ##
>  # @MemoryDeviceInfo:
>  #
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 8f603cc7e6..ceca52818a 100644
> --- a/qemu-options.hx

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org