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Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one fl
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive |
Date: |
Wed, 27 Nov 2013 14:52:45 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux) |
Jordan Justen <address@hidden> writes:
> On Tue, Nov 26, 2013 at 5:32 AM, Laszlo Ersek <address@hidden> wrote:
>> On 11/26/13 13:36, Markus Armbruster wrote:
>>
>>> Your stated purpose for multiple -pflash:
>>>
>>> This accommodates the following use case: suppose that OVMF is split in
>>> two parts, a writeable host file for non-volatile variable storage, and
>>> a
>>> read-only part for bootstrap and decompressible executable code.
>>>
>>> Such a split between writable part and read-only part makes sense to me.
>>> How is it done in physical hardware? Single device with configurable
>>> write-protect, or two separate devices?
>>
>> (Jordan could help more.)
>>
>> Likely one device that's fully writeable.
>
> Most parts will have a dedicated read-only line.
>
> Many devices have 'block-locking' that will make some subset of blocks
> read-only until a reset.
>
> In addition to this, many chipsets will allow flash writes to be
> protected by triggering SMM when a flash write occurs.
>
> Using multiple chips are less common due to cost, but this is not a
> factor for QEMU. :)
Should we stick to what real hardware does? Single device, perhaps with
block locking.
- Re: [Qemu-devel] [edk2 PATCH] OvmfPkg: split the variable store to a separate file, (continued)
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Eric Blake, 2013/11/21
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Markus Armbruster, 2013/11/22
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/22
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Markus Armbruster, 2013/11/25
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/25
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Markus Armbruster, 2013/11/26
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/26
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Jordan Justen, 2013/11/26
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive,
Markus Armbruster <=
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/27
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Markus Armbruster, 2013/11/27
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/27
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Markus Armbruster, 2013/11/27
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/27
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Markus Armbruster, 2013/11/27
- Re: [Qemu-devel] [edk2] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [edk2] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/26
- Re: [Qemu-devel] [edk2] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Markus Armbruster, 2013/11/26