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Re: [Qemu-devel] [PATCH v2] migration: discard non-migratable RAMBlocks
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v2] migration: discard non-migratable RAMBlocks |
Date: |
Thu, 10 May 2018 20:15:57 +0100 |
User-agent: |
Mutt/1.9.5 (2018-04-13) |
* Peter Maydell (address@hidden) wrote:
> On 9 May 2018 at 12:08, Dr. David Alan Gilbert <address@hidden> wrote:
> > This thread seems to have stalled; we've got the list of potential
> > migration breaks that Peter found and only some minor comments on the
> > actual patch.
> >
> > I'd like to get it going again sicne as well as Cédric, and Peter's
> > cases, there's Lai Jiangshan and now Eric Wheeler was asking for
> > something similar.
> >
> > Anyone understand the way forward? Do we have to go and fix the
> > odd board failures first?
>
> aspeed and highbank I already changed in master. That leaves
>
> hw/mips/boston.c: memory_region_init_rom_nomigrate(flash, NULL,
> hw/mips/mips_malta.c: memory_region_init_ram_nomigrate(bios_copy,
> NULL, "bios.1fc", BIOS_SIZE,
> hw/net/dp8393x.c: memory_region_init_ram_nomigrate(&s->prom, OBJECT(dev),
> [device only used on mips jazz board]
> hw/pci-host/xilinx-pcie.c: memory_region_init_ram_nomigrate(&s->io,
> OBJECT(s), "io", 16, NULL);
> [device only used on mips boston board]
>
> which affect mips boston, malta and jazz boards.
>
> I don't think we need to fix those first, but:
>
> * we should note in the commit message for this patch that
> it is a de-facto migration break for those boards
> * we should fix those devices/boards in this release cycle,
> since we've broken migration compat anyway
> * we should check with the MIPS maintainers that they're ok
> with a cross-version migration compat break for those boards
> (I've cc'd them)
OK, in that case, as long as they're OK, then I think
we should go for it.
Cédric: Were you going to post a version that didn't
do it in set_idstr?
Dave
> thanks
> -- PMM
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK