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From: "Ard Biesheuvel" <ardb@kernel.org>
Date: Mon, 23 Jan 2023 18:46:03 +0100
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Subject: Re: [PATCH] StandaloneMmPkg/StandaloneMmMemLib: Update AARCH64 address size
To: "Milosek, Damian" <damian.milosek@intel.com>
Cc: "devel@edk2.groups.io" <devel@edk2.groups.io>, "sami.mujawar@arm.com" <sami.mujawar@arm.com>, 
	"Yao, Jiewen" <jiewen.yao@intel.com>
Content-Type: text/plain; charset="UTF-8"

On Mon, 23 Jan 2023 at 17:14, Milosek, Damian <damian.milosek@intel.com> wrote:
>
>
>
> -----Original Message-----
> From: Ard Biesheuvel <ardb@kernel.org>
> Sent: Monday, January 23, 2023 5:05 PM
> To: Milosek, Damian <damian.milosek@intel.com>
> Cc: devel@edk2.groups.io; sami.mujawar@arm.com; Yao, Jiewen <jiewen.yao@intel.com>
> Subject: Re: [PATCH] StandaloneMmPkg/StandaloneMmMemLib: Update AARCH64 address size
>
> On Mon, 23 Jan 2023 at 16:51, Milosek, Damian <damian.milosek@intel.com> wrote:
> >
> >
> >
> >
> >
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of
> > Milosek, Damian
> > Sent: Monday, January 16, 2023 2:51 PM
> > To: devel@edk2.groups.io
> > Cc: Milosek, Damian <damian.milosek@intel.com>
> > Subject: [edk2-devel] [PATCH] StandaloneMmPkg/StandaloneMmMemLib:
> > Update AARCH64 address size
> >
> >
> >
> > Enable StandaloneMmMemLib to use longer physical addresses than 36 bits.
> >
>
> What is the purpose of this change?
>
> - Making this Lib working for newer systems that use longer addresses.
>

What is the symptom? How is it failing currently?

> > According to ARM "Learn the architecture - AArch64 memory management"
> >
> > since Armv8.2-A physical address size was extended to 52 bits.
> >
> > https://developer.arm.com/documentation/101811/0102/Address-spaces
> >
>
> This is an optional extension. Which hardware are you using that implements this extension?
>
> - System with Armv9-A Neoverse CPU cores.
>

Which system? What does the memory map look like?