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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Jun 16, 2016 at 06:53:37PM +0800, Shannon Zhao wrote:
> 
> 
> On 2016/6/16 18:49, Wei Liu wrote:
> > 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.
> Maybe you can have a look at the function InstallXenTables().
> 

Oh, I thought you were talking about Xen specific code. That's my
misunderstanding.

So that function (InstallXenTables) calls InstallAcpiTable, which
eventually calls AcpiProtocol->InstallAcpiTable.

Does it imply "UEFI wants all memory maps under its control"? Does it
imply UEFI will relocate those tables (or keep a copy to itself)?  The
answer "implementation specific" or "not sure" is not good enough to
address Julien's concern.

Maybe this is just due to miscommunication or using the wrong term. I
will refrain from commenting further now because the issue is quite ARM
specific. Don't want to distract you guys further.

Wei.

> Thanks,
> -- 
> Shannon
> 

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel