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Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent? |
Date: |
Fri, 8 Dec 2017 18:32:03 +0100 |
On Fri, 8 Dec 2017 14:14:22 -0200
Eduardo Habkost <address@hidden> wrote:
> On Fri, Dec 08, 2017 at 03:50:50PM +0100, Igor Mammedov wrote:
> > On Fri, 8 Dec 2017 13:19:27 +0000
> > Peter Maydell <address@hidden> wrote:
> >
> > > On 8 December 2017 at 13:16, Igor Mammedov <address@hidden> wrote:
> > > > TBH:
> > > > I do not recall why we have x86 max/host cpu types do feature
> > > > loading at realize time instead of at class init like the rest
> > > > of static cpu types.
> > >
> > > class init is too early, IIRC -- it's before KVM has been set up at all.
> >
> > that shouldn't be an issue as kvm_ppc_register_host_cpu_type() demonstrates
> > (i.e. an additional class init at kvm/tcg init time),
>
> It is possible, but IMO it's not a good idea. We should be able
> to enumerate all CPU types before the accelerator has been
> initialized, so query-cpu-definitions and "-cpu help" will always
> work.
>
>
> >
> > so it might be some compat issue or just legacy approach why it
> > havn't been rewritten to class_init for x86 the way PPC does.
> > But Eduardo probably knows better if there is anything left that
> > prevents using class init there.
>
> It's the opposite: x86 "host" CPU model used to work the same way
> as PPC, but we changed it so all classes are registered at
> type_init()-time.
Is it for libvirt convenience, so that it would be able to cache
all supported cpus regardless of whether they would actually work
or not?
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, (continued)
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Igor Mammedov, 2017/12/07
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Peter Maydell, 2017/12/07
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Eduardo Habkost, 2017/12/07
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Peter Maydell, 2017/12/07
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Peter Maydell, 2017/12/07
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Igor Mammedov, 2017/12/08
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Peter Maydell, 2017/12/08
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Igor Mammedov, 2017/12/08
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Peter Maydell, 2017/12/08
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Eduardo Habkost, 2017/12/08
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?,
Igor Mammedov <=
- Re: [Qemu-devel] in a device or CPU instance init/realize, can I rely on something having the BQL or equivalent?, Eduardo Habkost, 2017/12/08