Re: [Xen-devel] [PATCH 15/15] xen: tools: expose EPC in ACPI table

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 09/07/17 10:16, Kai Huang wrote:
> On physical machine EPC is exposed in ACPI table via "INT0E0C". Although EPC
> can be discovered by CPUID but Windows driver requires EPC to be exposed in
> ACPI table as well. This patch exposes EPC in ACPI table.
:(

> diff --git a/tools/libacpi/dsdt.asl b/tools/libacpi/dsdt.asl
> index fa8ff317b2..25ce196028 100644
> --- a/tools/libacpi/dsdt.asl
> +++ b/tools/libacpi/dsdt.asl
> @@ -441,6 +441,55 @@ DefinitionBlock ("DSDT.aml", "DSDT", 2, "Xen", "HVM", 0)
>                   }
>               }
>           }
> +
> +        Device (EPC)
Would it not be better to put this into an SSDT, and only expose it to 
the guest if SGX is advertised?
~Andrew

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