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Re: [Qemu-devel] [PATCH 1/7] qemu-doc: Document minimum kernel version f
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH 1/7] qemu-doc: Document minimum kernel version for KVM in x86_64 |
Date: |
Tue, 10 Oct 2017 12:33:35 -0300 |
User-agent: |
Mutt/1.9.0 (2017-09-02) |
On Mon, Oct 09, 2017 at 03:40:02PM +0200, Paolo Bonzini wrote:
> On 06/10/2017 23:52, Eduardo Habkost wrote:
> > The default set of KVM CPU features require the host kernel to
> > support them. KVM_PV_EOI is the newest one, and was included on
> > Linux v3.6 (Linux commit ae7a2a3f).
> >
> > Running on an old host might break management software
> > expectations because the latest machine-type won't be runnable
> > while older machine-types might be runnable. Document v3.6 as
> > the minimum kernel version for KVM on x86_64.
> >
> > Signed-off-by: Eduardo Habkost <address@hidden>
> > ---
> > qemu-doc.texi | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> >
> > diff --git a/qemu-doc.texi b/qemu-doc.texi
> > index ecd186a159..be45b6b6f6 100644
> > --- a/qemu-doc.texi
> > +++ b/qemu-doc.texi
> > @@ -37,6 +37,7 @@
> > * QEMU System emulator for non PC targets::
> > * QEMU Guest Agent::
> > * QEMU User space emulator::
> > +* System requirements::
> > * Implementation notes::
> > * Deprecated features::
> > * License::
> > @@ -2348,6 +2349,14 @@ Act as if the host page size was 'pagesize' bytes
> > Run the emulation in single step mode.
> > @end table
> >
> > address@hidden System requirements
> > address@hidden System requirements
> > +
> > address@hidden KVM kernel module
> > +
> > +On x86_64 hosts, the default set of CPU features enabled by the KVM
> > accelerator
> > +require the host to be running Linux v3.6 or newer.
> > +
> >
> > @include qemu-tech.texi
> >
> >
>
> Maybe we should expand on the consequences of running on older versions?
I intentionally tried to not make any commitment to what should
happen if running an older kernel. But a quick explanation of
what can happen is probably a good idea. I will try to come up
with something.
--
Eduardo
- [Qemu-devel] [PATCH 0/7] x86: Rework KVM-defaults compat code, enable kvm_pv_unhalt by default, Eduardo Habkost, 2017/10/06
- [Qemu-devel] [PATCH 1/7] qemu-doc: Document minimum kernel version for KVM in x86_64, Eduardo Habkost, 2017/10/06
- [Qemu-devel] [PATCH 2/7] target/i386: x86_cpu_expand_feature() helper, Eduardo Habkost, 2017/10/06
- [Qemu-devel] [PATCH 3/7] target/i386: Use global variables to control KVM defaults, Eduardo Habkost, 2017/10/06
- [Qemu-devel] [PATCH 4/7] kvm: Define KVM_FEAT_* even if CONFIG_KVM is not defined, Eduardo Habkost, 2017/10/06
- [Qemu-devel] [PATCH 5/7] target/i386: Handle kvm_auto_* compat in x86_cpu_expand_features(), Eduardo Habkost, 2017/10/06
- [Qemu-devel] [PATCH 6/7] pc: Use compat_props to control KVM defaults compatibility, Eduardo Habkost, 2017/10/06
- [Qemu-devel] [PATCH 7/7] target/i386: Enable kvm_pv_unhalt by default, Eduardo Habkost, 2017/10/06
- Re: [Qemu-devel] [PATCH 0/7] x86: Rework KVM-defaults compat code, enable kvm_pv_unhalt by default, Paolo Bonzini, 2017/10/09