[Xen-devel] [PATCH v3 07/62] arm/acpi: Add arch_acpi_os_map_memory helper function for ARM

Julien Grall julien.grall at citrix.com
Mon Nov 30 06:47:52 PST 2015


On 23/11/15 11:37, Stefano Stabellini wrote:
> On Tue, 17 Nov 2015, shannon.zhao at linaro.org wrote:
>> From: Shannon Zhao <shannon.zhao at linaro.org>

> could you please add a couple of lines to the commit message mentioning
> why __va(phys) is an acceptable implementation of arch_acpi_os_map_memory?

FWIW, I already asked this question multiple time on the previous series
without clear answer.

__va should only be used when the memory is direct-mapped to Xen (i.e
accessible directly). On ARM64, this is only the case for the RAM. Can
someone confirm the ACPI will always reside to the RAM?


Julien Grall

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