> Sent: Friday, October 15, 2021 1:46 PM
> To: Yao, Jiewen
> Cc: devel@edk2.groups.io; Xu, Min M ; Ard Biesheuvel
> ; Justen, Jordan L ;
> Brijesh Singh ; Erdem Aktas
> ; James Bottomley ; Tom
> Lendacky
> Subject: Re: [edk2-devel] [PATCH V2 21/28] OvmfPkg: Update PlatformPe
Hi,
> The original mailbox location is in low memory. If we do not relocate
> to high memory, then the OS will see a hole in low memory.
Well, both low and high memory to be exact. qemu maps the whole
firmware image below 4G, and mirrors the topmost 128k (including
memfd + reset vector) below
Yao, Jiewen ; Tom Lendacky
>
> Subject: Re: [edk2-devel] [PATCH V2 21/28] OvmfPkg: Update PlatformPei to
> support TDX
>
> Hi,
>
> > 2. Relocate mailbox
> > At the beginning of system boot, a 4K-aligned, 4K-size memory (Td
> > mailbox) is pre-allocated b
Hi,
> 2. Relocate mailbox
> At the beginning of system boot, a 4K-aligned, 4K-size memory (Td
> mailbox) is pre-allocated by host VMM. BSP & APs do the page accept
> together in that memory region.
> After that TDVF is designed to relocate the mailbox to a 4K-aligned,
> 4K-size memory
