Re: [PATCH] Issue #2294 | Machine microvm doesn't run under Xen accel for x86_64

[Manos Pitsidianakis]

On Wed, 29 May 2024 at 11:25, Vilhelm Gyda <vilhelmgyda@gmail.com> wrote:
>
> @philmd commented on gitlab: Discussed with @epilys on IRC, only Xen
> machines (xenpv/xenfv) configure Xen so can run under it.
>
> But if we want to make it work under Xen. Any ideas how to move in
> that direction?

We'd have to specify what "works under Xen" means; xen as a type 1
hypervisor? I am trying to think if it makes sense, Xen machines in
qemu already provide PV devices analogously to what microvm promises
to support. What would be the use case for a  "hypervisor agnostic"
microvm machine?

>
> On Wed, May 29, 2024 at 12:37 PM Paolo Bonzini <pbonzini@redhat.com> wrote:
> >
> > On 5/28/24 12:23, Will Gyda wrote:
> > > Issue #2294: Machine microvm doesn't run under Xen accel for 
> > > qemu-system-x86_64.
> > > Solution: microvm is now not build if only Xen is available.
> >
> > This does not fix the issue that microvm does not start with a Xen
> > accelerator.  I think it would be better to try and make it work instead.
> >
> > Paolo
> >
> > > Signed-off-by: Will Gyda <vilhelmgyda@gmail.com>
> > >
> > > ---
> > >   configs/devices/i386-softmmu/default.mak | 2 +-
> > >   hw/i386/Kconfig                          | 2 ++
> > >   2 files changed, 3 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/configs/devices/i386-softmmu/default.mak 
> > > b/configs/devices/i386-softmmu/default.mak
> > > index 598c6646df..6a73aee7dd 100644
> > > --- a/configs/devices/i386-softmmu/default.mak
> > > +++ b/configs/devices/i386-softmmu/default.mak
> > > @@ -29,4 +29,4 @@
> > >   CONFIG_ISAPC=y
> > >   CONFIG_I440FX=y
> > >   CONFIG_Q35=y
> > > -CONFIG_MICROVM=y
> > > +#CONFIG_MICROVM=n
> > > diff --git a/hw/i386/Kconfig b/hw/i386/Kconfig
> > > index a6ee052f9a..f8ec8ebd7a 100644
> > > --- a/hw/i386/Kconfig
> > > +++ b/hw/i386/Kconfig
> > > @@ -108,6 +108,8 @@ config Q35
> > >
> > >   config MICROVM
> > >       bool
> > > +    default y
> > > +    depends on KVM || WHPX || NVMM || HVF
> > >       select SERIAL_ISA # for serial_hds_isa_init()
> > >       select ISA_BUS
> > >       select APIC
> >
>



-- 
Manos Pitsidianakis
Emulation and Virtualization Engineer at Linaro Ltd