Re: Which kernel version meet the needs, when run QEMU 5.1 on kunpeng 920 ARM serever?

[Jakob Bohm]

On 22/05/2020 22:19, Sid Spry wrote:
> On Thu, May 21, 2020, at 2:17 AM, linwei6@ruijie.com.cn wrote:
> > On Wed, 2020-05-20 at 11:10 -0500, Sid Spry wrote:
> > > On Wed, May 20, 2020, at 3:11 AM, linwei6@ruijie.com.cn wrote:
> > > > How can I figure out which kernel version will meet the needs if I
> > > > am
> > > > using Qemu 5.x on huawei KunPeng 920 ARM server, which will fully
> > > > use
> > > > the hardware supported feature on this kind of server?
> > > >
> > > > Is there any basic mathod out there to quickly find out?
> > > What do you mean by features? If you mean CPU virtualization
> > > features, -machine accel=kvm and -cpu host will enable everything
> > > that can be enabled.
> > >
> > > Hardware devices need to be explicitly passed in.
> > >
> > > If you use a modern distribution's kernel it will have modules for
> > > all qemu devices available by default.
> > Hardware features which I mean is something like VHE, SMMU, GICv3(may
> > be GICv4) etc. Are these all enable and can neatly support on the
> > kernel version 4.14(Centos7 aarch64) and can be utilize by my virtual
> > machine, should I try the latest version kernel 5.x, is that necessary?
> Ok, I leave exhaustive check to you, but based on mailing list postings circa 
> 2015[0] those features are supported in some 4.x kernels.
>
> If it makes no difference otherwise I highly recommend always choosing the 
> higher kernel version especially when tracking new hardware developments. By 
> the time hardware is released typically it just works.
>
> Also -- the features listed are integral to KVM's operation. If they weren't 
> supported I doubt KIM would function.
>
>
> [0]: https://lists.cs.columbia.edu/pipermail/kvmarm/2015-July/015619.html
This info (with actual specificity) needs to be in the maintained
qemu docs.

Main README should state minimum kernel versions for each qemu-feature,
from TCG to KVM hardware pass through of specific GPUs.

qemu-system manpage should list extra host requirements for any
option/device/feature that needs more than the minimum.


Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  http://www.wisemo.com
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