Re: [PATCH 2/3] automation: Linux 5.10.74 test-artifact

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Thu, 28 Oct 2021, Juergen Gross wrote:
> On 28.10.21 01:24, Stefano Stabellini wrote:
> > On Wed, 27 Oct 2021, Stefano Stabellini wrote:
> > > On Wed, 27 Oct 2021, Juergen Gross wrote:
> > > > On 26.10.21 02:54, Stefano Stabellini wrote:
> > > > > On Mon, 25 Oct 2021, Juergen Gross wrote:
> > > > > > On 22.10.21 21:41, Stefano Stabellini wrote:
> > > > > > > +Juergen
> > > > > > > 
> > > > > > > On Fri, 22 Oct 2021, Andrew Cooper wrote:
> > > > > > > > On 22/10/2021 00:08, Stefano Stabellini wrote:
> > > > > > > > > +# build depends
> > > > > > > > > +RUN apt-get update && \
> > > > > > > > > +    apt-get --quiet --yes install \
> > > > > > > > > +        build-essential \
> > > > > > > > > +        libssl-dev \
> > > > > > > > > +        bc \
> > > > > > > > > +        curl \
> > > > > > > > > +        flex \
> > > > > > > > > +        bison \
> > > > > > > > > +        libelf-dev \
> > > > > > > > > +        && \
> > > > > > > > > +    \
> > > > > > > > > +    # Build the kernel
> > > > > > > > > +    curl -fsSLO
> > > > > > > > > https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-"$LINUX_VERSION".tar.xz
> > > > > > > > > && \
> > > > > > > > > +    tar xvJf linux-"$LINUX_VERSION".tar.xz && \
> > > > > > > > > +    cd linux-"$LINUX_VERSION" && \
> > > > > > > > > +    make defconfig && \
> > > > > > > > > +    make xen.config && \
> > > > > > > > > +    cp .config .config.orig && \
> > > > > > > > > +    cat .config.orig | grep XEN | grep =m |sed 's/=m/=y/g' >>
> > > > > > > > > .config
> > > > > > > > > && \
> > > > > > > > > +    make -j$(nproc) bzImage && \
> > > > > > > > 
> > > > > > > > defconfig is huuuuge.  Can we use tinyconfig instead?
> > > > > > > > 
> > > > > > > > Also, you want to turn off CONFIG_MODULES seeing as you only
> > > > > > > > copy
> > > > > > > > bzImage to the test.
> > > > > > > > 
> > > > > > > > This also fixes the fact that `grep XEN` also matches
> > > > > > > > CONFIG_NETXEN_NIC
> > > > > > > > which has nothing to do with Xen.
> > > > > > > 
> > > > > > > Tinyconfig would be a good idea but it crashes on QEMU with the
> > > > > > > appended
> > > > > > > boot log. I did:
> > > > > > > 
> > > > > > > # make tinyconfig
> > > > > > > # make xen.config
> > > > > > > # make bzImage
> > > > > > > 
> > > > > > > Of course we could have our own tailored special kernel config for
> > > > > > > this
> > > > > > > kernel but I like the simplicify of "make tinyconfig" or "make
> > > > > > > defconfig" followed by "make xen.config".
> > > > > > > 
> > > > > > > Unless you know one kconfig option or two that we need to add to
> > > > > > > tinyconfig to make it work my preference is to go with defconfig
> > > > > > > for
> > > > > > > now.
> > > > > > 
> > > > > > You will need to add the dom0 and SMP related config options at
> > > > > > least.
> > > > > > 
> > > > > > I'll have a look at config.xen, which is a little bit weird: it
> > > > > > configures the backends, but not dom0.
> > > > > 
> > > > > Thanks, it would be good if make tinyconfig && make xen.config would
> > > > > just work on QEMU. In the meantime I'll keep defconfig for this test,
> > > > > we
> > > > > can always improve later.
> > > > 
> > > > Can you please test the attached patch?
> > > 
> > > Yes, that works, thanks!
> > 
> > Sorry, I spoke too soon: same error as before:
> > 
> > https://gitlab.com/xen-project/people/sstabellini/xen/-/jobs/1722909607/raw
> > 
> > (XEN) Hardware Dom0 crashed: rebooting machine in 5 seconds.
> > 
> > No output from the kernel.
> 
> This is not very surprising, as tinyconfig doesn't have CONFIG_PRINTK.
> BTW, it doesn't have initrd support either (BLK_DEV_RAM and
> BLK_DEV_INITRD), so I added those to xen.config as well.
> 
> With the (updated) attached patch the kernel boots fine as dom0 until
> rootfs is tried to be mounted on a physical machine.
> 
> I've added CONFIG_BUG, too, in order to have more debugging output if
> needed.

Much better, now there is output:
https://gitlab.com/xen-project/people/sstabellini/xen/-/jobs/1726396600/raw

This kernel is used as dom0 and from the logs it looks like for dom0 we
need a couple more things:
- flocks
- the kconfig to recognize #!/bin/sh