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Re: [Qemu-devel] [PATCH v2 0/6] x86: Physical address limit patches
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v2 0/6] x86: Physical address limit patches |
Date: |
Tue, 5 Jul 2016 15:39:36 +0300 |
On Tue, Jul 05, 2016 at 01:46:58PM +0200, Paolo Bonzini wrote:
>
>
> On 05/07/2016 13:09, Michael S. Tsirkin wrote:
> > > How do you handle migration in the above scenario from say 46bit host to
> > > 39bit host, where the firmware has mapped (while running on the source)
> > > a 64-bit BAR above the destination's maximum physical address?
> >
> > Again management would specify how much 64 bit pci space firmware should
> > use.
> > If more is specified than host can support we can error out.
>
> Ok, so the destination would fail to start.
>
> It sounds good, and it may provide a good reason not to enable
> autodetection of phys-addr-bits for new machine types. We still want
> David's patches for -cpu host,
Right, but I think current patches aren't limited to -cpu host -
I guess they will need some changes then?
> and for improved backwards compatibility
> now that KVM_SET_MSR error detection is strict.
Sounds good.
> Thanks,
>
> Paolo
- Re: [Qemu-devel] [PATCH v2 6/6] x86: Add sanity checks on phys_bits, (continued)
Re: [Qemu-devel] [PATCH v2 0/6] x86: Physical address limit patches, Daniel P. Berrange, 2016/07/05