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Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one fl
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive |
Date: |
Wed, 27 Nov 2013 15:01:04 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131118 Thunderbird/17.0.11 |
On 11/27/13 14:52, Markus Armbruster wrote:
> 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.
I can't back a single flash device with two drives (= two host-side
files), which is the incentive for this change.
Thanks
Laszlo
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, (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, 2013/11/27
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive,
Laszlo Ersek <=
- 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
- Re: [Qemu-devel] [qemu PATCH] hw/i386/pc_sysfw: support more than one flash drive, Laszlo Ersek, 2013/11/26