Re: [PATCH v2] target/i386: Add unaccepted memory configuration

[Daniel P . Berrangé]

On Wed, Jun 29, 2022 at 07:37:01PM +0000, Dionna Glaze wrote:
> For SEV-SNP, an OS is "SEV-SNP capable" without supporting this UEFI
> v2.9 memory type. In order for OVMF to be able to avoid pre-validating
> potentially hundreds of gibibytes of data before booting, it needs to
> know if the guest OS can support its use of the new type of memory in
> the memory map.

This talks about something supported for SEV-SNP, but....

>  static void
>  sev_guest_class_init(ObjectClass *oc, void *data)
>  {
> @@ -376,6 +401,14 @@ sev_guest_class_init(ObjectClass *oc, void *data)
>                                     sev_guest_set_kernel_hashes);
>      object_class_property_set_description(oc, "kernel-hashes",
>              "add kernel hashes to guest firmware for measured Linux boot");
> +    object_class_property_add_enum(oc, "accept-all-memory",
> +                                   "MemoryAcceptance",
> +                                   &memory_acceptance_lookup,
> +        sev_guest_get_accept_all_memory, sev_guest_set_accept_all_memory);
> +    object_class_property_set_description(
> +        oc, "accept-all-memory",
> +        "false: Accept all memory, true: Accept up to 4G and leave the rest 
> unaccepted (UEFI"
> +        " v2.9 memory type), default: default firmware behavior.");
>  }

..this is adding a property to the 'sev-guest' object, which only
targets SEV/SEV-ES currently AFAIK.

The most recent patches I recall for SEV-SNP introduced a new
'sev-snp-guest' object instead of overloading the existing
'sev-guest' object:

  https://lists.gnu.org/archive/html/qemu-devel/2021-08/msg04757.html



With regards,
Daniel
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