Re: [Xen-devel] [PATCH RESEND 03/14] libxc: Add placeholders for ACPI tables blob and size

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Jun 07, 2016 at 08:32:26PM +0800, Shannon Zhao wrote:
[...]
> That's its own mechanism I think and UEFI wants all the memory maps
> under its control. And it's same for QEMU(x86 and ARM) and also for Xen
> on x86. You can have a look at the OvmfPkg/AcpiPlatformDxe/Xen.c which
> is used for x86 Xen DomU.
> 

I don't think Xen relocates ACPI tables in OVMF. The code scans for
signature in code.

I also don't quite get the "control memory map" part. OVMF doesn't
update the memory map, it accepts the memory map provided by hvmloader
as-is. See OvmfPkg/PlatformPei/Xen.c:XenGetE820Map.

Note that I'm talking about this in a pretty out of context way, so I
could be misunderstading what you said.

> > Anyway, you rely on the UEFI firmware to always relocating the tables.
> > What would happen if they decide to remove this behavior?
> Eh, I don't believe this would happen.
> 

I think we can only rely on the spec to be sure.

Wei.

> -- 
> Shannon
> 

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