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Re: [Qemu-devel] [PATCH 0/5] pc: make ROMs resizeable
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH 0/5] pc: make ROMs resizeable |
Date: |
Wed, 19 Nov 2014 09:16:09 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
"Michael S. Tsirkin" <address@hidden> writes:
> On Tue, Nov 18, 2014 at 03:47:16PM +0100, Markus Armbruster wrote:
>> "Michael S. Tsirkin" <address@hidden> writes:
>>
>> > At the moment we migrate ROMs which reside in fw cfg, which allows
>> > changing ROM code at will, and supports migrating largish blocks early,
>> > with good performance.
>> > However, we are running into a problem: changing size breaks
>> > migration every time.
>>
>> Pardon my ignorance... changing ROM in migration? I would expect
>> migration to be as transparent for ROM as it is for RAM. What am I
>> missing?
>>
>> [...]
>
> Nothing really.
>
> We migrate RAM size too - but if there's a mismatch, migration fails.
>
> RAM size is user configurable.
>
> ROM is used internally so we have to figure out the size,
> and it turned out to be a hard problem, so we end up maintaining
> logic for ROM size "like we did in 1.7" "like we did in 2.0" etc.
>
> I don't want to add any more: let's just accept whatever is migrated,
> and stick to it.
Are you proposing to change ROM size on the target from "whatever was
configured during startup" to "whatever is configured on the source"?
- Re: [Qemu-devel] [PATCH 2/5] exec: qemu_ram_alloc_device, qemu_ram_resize, (continued)
- [Qemu-devel] [PATCH 4/5] memory: interface to allocate device ram, Michael S. Tsirkin, 2014/11/17
- [Qemu-devel] [PATCH 5/5] acpi-build: make ROMs device RAM, make them resizeable, Michael S. Tsirkin, 2014/11/17
- [Qemu-devel] [PATCH 3/5] arch_init: support resizing on incoming migration, Michael S. Tsirkin, 2014/11/17
- Re: [Qemu-devel] [PATCH 0/5] pc: make ROMs resizeable, Michael S. Tsirkin, 2014/11/17
- Re: [Qemu-devel] [PATCH 0/5] pc: make ROMs resizeable, Markus Armbruster, 2014/11/18
- Re: [Qemu-devel] [PATCH 0/5] pc: make ROMs resizeable, Amit Shah, 2014/11/19
Re: [Qemu-devel] [PATCH 0/5] pc: make ROMs resizeable, Peter Maydell, 2014/11/19