[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


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

> 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

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.