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Date:	Mon, 16 Jun 2014 02:19:46 +0100
From:	Matthew Garrett <>
To:	Daniel Kiper <>
Subject: Re: [PATCH v5 1/7] efi: Use early_mem*() instead of early_io*()

On Fri, Jun 13, 2014 at 07:00:17PM +0200, Daniel Kiper wrote:
> Use early_mem*() instead of early_io*() because all mapped EFI regions
> are true RAM not I/O regions. Additionally, I/O family calls do not work
> correctly under Xen in our case. AIUI, early_io*() maps/unmaps real machine
> addresses. However, all artificial EFI structures created under Xen live
> in dom0 memory and should be mapped/unmapped using early_mem*() family
> calls which map domain memory.

Mapped EFI regions may include memory mapped flash, not merely true RAM.

Matthew Garrett |
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