From mboxrd@z Thu Jan 1 00:00:00 1970 From: julien.grall@citrix.com (Julien Grall) Date: Mon, 30 Nov 2015 14:47:52 +0000 Subject: [Xen-devel] [PATCH v3 07/62] arm/acpi: Add arch_acpi_os_map_memory helper function for ARM In-Reply-To: References: <1447753261-7552-1-git-send-email-shannon.zhao@linaro.org> <1447753261-7552-8-git-send-email-shannon.zhao@linaro.org> Message-ID: <565C6198.3070805@citrix.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, On 23/11/15 11:37, Stefano Stabellini wrote: > On Tue, 17 Nov 2015, shannon.zhao at linaro.org wrote: >> From: Shannon Zhao > 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? Regards, -- Julien Grall