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From: "Jan Beulich" <JBeulich@suse.com>
To: Julien Grall <julien.grall@arm.com>
Cc: shannon.zhao@linaro.org, xen-devel@lists.xen.org,
	stefano.stabellini@citrix.com, peter.huangpeng@huawei.com,
	Shannon Zhao <zhaoshenglong@huawei.com>
Subject: Re: [PATCH v6 01/22] arm/acpi: Estimate memory required for acpi/efi tables
Date: Mon, 21 Mar 2016 07:01:41 -0600	[thread overview]
Message-ID: <56EFFEC502000078000DED4D@prv-mh.provo.novell.com> (raw)
In-Reply-To: <56EC4CA9.4090309@arm.com>

>>> On 18.03.16 at 19:44, <julien.grall@arm.com> wrote:
> On 17/03/16 09:40, Shannon Zhao wrote:
>> --- /dev/null
>> +++ b/xen/arch/arm/efi/efi-dom0.c
>> @@ -0,0 +1,50 @@
>> +/*
>> + *  efi-dom0.c - Domain0 EFI Boot Support
>> + *
>> + *  Copyright (C) 2016 Shannon Zhao <shannon.zhao@linaro.org>
>> + *
>> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> + *
>> + *  This program is free software; you can redistribute it and/or modify
>> + *  it under the terms of the GNU General Public License as published by
>> + *  the Free Software Foundation; either version 2 of the License, or
>> + *  (at your option) any later version.
>> + *
>> + *  This program is distributed in the hope that it will be useful,
>> + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + *  GNU General Public License for more details.
>> + *
>> + *  You should have received a copy of the GNU General Public License
>> + *  along with this program; If not, see <http://www.gnu.org/licenses/>.
>> + *
>> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> + */
>> +
>> +#include "efi.h"
>> +#include "efi-dom0.h"
>> +#include <asm/setup.h>
>> +#include <asm/acpi.h>
>> +
>> +struct meminfo __initdata acpi_mem;
> 
> I'm worry about sharing data between the EFI stub and Xen. On ARM, the 
> EFI stub is completely independent. Once it has finished to execute, it 
> will call xen as if it runs without UEFI.
> 
> This means that BSS will be zeroed. I would have expect to see acpi_mem 
> residing in BSS. So I'm wondering how this can work.

The __initdata annotation makes it a member of .init.data instead
of the expected .bss.

Jan


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  reply	other threads:[~2016-03-21 13:01 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-17  9:40 [PATCH v6 00/22] Prepare UEFI and ACPI tables for Dom0 on ARM64 Shannon Zhao
2016-03-17  9:40 ` [PATCH v6 01/22] arm/acpi: Estimate memory required for acpi/efi tables Shannon Zhao
2016-03-18 18:44   ` Julien Grall
2016-03-21 13:01     ` Jan Beulich [this message]
2016-03-22 13:01     ` Shannon Zhao
2016-03-22  0:28   ` Julien Grall
2016-03-24 12:36   ` Stefano Stabellini
2016-03-17  9:40 ` [PATCH v6 02/22] arm/acpi: Add a helper function to get the acpi table offset Shannon Zhao
2016-03-21 12:16   ` Julien Grall
2016-03-24 12:32   ` Stefano Stabellini
2016-03-17  9:40 ` [PATCH v6 03/22] arm/acpi: Prepare FADT table for Dom0 Shannon Zhao
2016-03-21 12:25   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 04/22] arm/gic: Add a new callback for creating MADT " Shannon Zhao
2016-03-21 15:18   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 05/22] arm/acpi: Prepare " Shannon Zhao
2016-03-21 15:26   ` Julien Grall
2016-03-21 15:51     ` Jan Beulich
2016-03-17  9:40 ` [PATCH v6 06/22] arm/acpi: Prepare STAO " Shannon Zhao
2016-03-21 15:31   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 07/22] arm/acpi: Prepare XSDT " Shannon Zhao
2016-03-21 15:43   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 08/22] arm/acpi: Prepare RSDP " Shannon Zhao
2016-03-21 15:47   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 09/22] arm/p2m: Add helper functions to map memory regions Shannon Zhao
2016-03-21 15:52   ` Julien Grall
2016-03-22 13:05     ` Shannon Zhao
2016-03-22 15:59       ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 10/22] arm/acpi: Map all other tables for Dom0 Shannon Zhao
2016-03-21 15:57   ` Julien Grall
2016-03-17  9:40 ` [PATCH v6 11/22] arm/acpi: Prepare EFI system table " Shannon Zhao
2016-03-21 16:10   ` Julien Grall
2016-03-22 13:06     ` Shannon Zhao
2016-03-22 13:24       ` Jan Beulich
2016-03-17  9:40 ` [PATCH v6 12/22] arm/acpi: Prepare EFI memory descriptor " Shannon Zhao
2016-03-21 16:51   ` Julien Grall
2016-03-22 13:16     ` Shannon Zhao
2016-03-22 16:04       ` Julien Grall
2016-03-24 15:06         ` Shannon Zhao
2016-03-24 15:23           ` Julien Grall
2016-03-24 12:39   ` Stefano Stabellini
2016-03-17  9:40 ` [PATCH v6 13/22] arm/acpi: Map the new created EFI and ACPI tables to Dom0 Shannon Zhao
2016-03-22  0:42   ` Julien Grall
2016-03-22 13:18     ` Shannon Zhao
2016-03-22 16:16       ` Julien Grall
2016-03-24 14:59         ` Shannon Zhao
2016-03-24 15:35           ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 14/22] arm/acpi: Create min DT stub for Dom0 Shannon Zhao
2016-03-22  1:07   ` Julien Grall
2016-03-22 13:23     ` Shannon Zhao
2016-03-17  9:41 ` [PATCH v6 15/22] arm/acpi: Permit access all Xen unused SPIs " Shannon Zhao
2016-03-22 18:18   ` Julien Grall
2016-03-24 15:01     ` Shannon Zhao
2016-03-24 15:37       ` Julien Grall
2016-03-25  7:13         ` Shannon Zhao
2016-03-17  9:41 ` [PATCH v6 16/22] arm/acpi: Configure SPI interrupt type and route to Dom0 dynamically Shannon Zhao
2016-03-22 19:17   ` Julien Grall
2016-03-24 12:41   ` Stefano Stabellini
2016-03-17  9:41 ` [PATCH v6 17/22] arm/gic: Add a new callback to deny Dom0 access to GIC regions Shannon Zhao
2016-03-22 19:33   ` Julien Grall
2016-03-24 12:45     ` Stefano Stabellini
2016-03-24 15:03       ` Shannon Zhao
2016-03-24 15:39         ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 18/22] arm/acpi: Permit MMIO access of Xen unused devices for Dom0 Shannon Zhao
2016-03-23 11:50   ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 19/22] hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ Shannon Zhao
2016-03-17 10:42   ` Jan Beulich
2016-03-17 11:04     ` Shannon Zhao
2016-03-17 11:29       ` Jan Beulich
2016-03-17 11:56         ` Shannon Zhao
2016-03-17 12:42           ` Jan Beulich
2016-03-17  9:41 ` [PATCH v6 20/22] xen/acpi: Fix event-channel interrupt when booting with ACPI Shannon Zhao
2016-03-23 12:15   ` Julien Grall
2016-03-17  9:41 ` [PATCH v6 21/22] xen/arm: Add a hypercall for device mmio mapping Shannon Zhao
2016-03-17  9:41 ` [PATCH v6 22/22] xen/arm64: Add ACPI support Shannon Zhao
2016-03-17 10:52   ` Jan Beulich
2016-03-17 11:03     ` Shannon Zhao
2016-03-17 11:31       ` Jan Beulich
2016-03-17 13:10         ` Shannon Zhao
2016-03-17 13:24           ` Jan Beulich

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