Re: [Xen-devel] [PATCH v2] xenfv: set has_acpi_build to false

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 28 Oct 2016, Wei Liu wrote:
> On Thu, Oct 27, 2016 at 11:58:29AM -0700, Stefano Stabellini wrote:
> > On Thu, 27 Oct 2016, Sander Eikelenboom wrote:
> > > Thursday, October 27, 2016, 3:51:09 PM, you wrote:
> > > 
> > > > Xen's toolstack is in charge of building ACPI tables. Skip ACPI table
> > > > building and loading in QEMU by setting has_acpi_build to false for
> > > > xenfv machine.
> > > 
> > > > This issue is discovered due to direct kernel boot on Xen doesn't boot
> > > > anymore, because the new ACPI tables cause the guest to exceed its
> > > > memory allocation limit.
> > > 
> > > > Reported-by: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
> > > > Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> > > 
> > > Just given this patch a spin and you may add a:
> > > Tested-by: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
> > 
> > The problem with this patch is that it only covers the xenfv machine
> > case, which is default, but QEMU can also be invoked with -M
> > pc,accel=xen. That case wouldn't be fixed by this patch. Wei, you can
> > test it by adding "xen_platform_pci=0" to the VM config file.
> > That's why we probably need a new option, similar to has_acpi_build, but
> > that can be changed at accelerator init time.
> > 
> 
> Do you mean we should add a new field to AccelClass?

I mean that this patch is insufficient unfortunately. I am not sure
about what is the best way to solve this problem, but Eduardo suggested
to add a new PCMachineState field:
http://marc.info/?l=qemu-devel&m=147749203112422&w=2

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