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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next prev parent 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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