Re: [PATCH] OvmfPkg: Fix SevMemoryAcceptance memory attributes

["Dionna Glaze" <dionnaglaze@google.com>]

>
> efi: mem94: [Conventional|   |  |CC|  |  |  |  |  |  |   |  |  |  |  ]
> range=[0x0000000100000000-0x000000023fffffff] (5120MB)
>
> This does not have the cache capabilities one would expect for system
> memory, UC|WC|WT|WB.
>
> After this change, the same entry becomes
>
> efi: mem94: [Conventional|   |  |CC|  |  |  |  |  |  |   |WB|WT|WC|UC]
> range=[0x0000000100000000-0x000000023fffffff] (5120MB)
>
> This has all the expected attributes.
>

This change is made given a request from Ard. The CC capability is not
applied to other system memory ranges that probably should also have
that capability, given that it's encrypted and accepted. I haven't
considered carefully where EFI_MEMORY_CPU_CRYPTO should be added to
conventional memory, given the acceptance happens before DXE
initializes. Perhaps
CoreConvertResourceDescriptorHobAttributesToCapabilities? This is more
of a question to Ard and Thomas.

-- 
-Dionna Glaze, PhD (she/her)