linux-kernel - Re: Xen regression, Was: [PATCH] x86/irq: Probe for PIC presence before allocating descs for legacy IRQs

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Date:	Tue, 12 Apr 2016 16:15:57 -0700 (PDT)
From:	Stefano Stabellini <sstabellini@...nel.org>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
cc:	Stefano Stabellini <sstabellini@...nel.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	linux-kernel@...r.kernel.org, konrad.wilk@...cle.com,
	david.vrabel@...rix.com, jgross@...e.com
Subject: Re: Xen regression, Was: [PATCH] x86/irq: Probe for PIC presence
 before allocating descs for legacy IRQs

On Tue, 12 Apr 2016, Boris Ostrovsky wrote:
> On 04/12/2016 05:56 PM, Stefano Stabellini wrote:
> > 
> >   I am not sure, maybe you didn't have CONFIG_SPARSE_IRQ?
> > But I am certain that 4.6-rc2, with the attached config, fails as Dom0
> > on QEMU with the following sequence of calls:
> 
> I did have CONFIG_SPARSE_IRQ and I just rebuilt 4.5.0 with your config
> (4.6-rc3 doesn't build for me for some reason) and that booted dom0 as well.
> 
> BTW, what do you mean by "dom0 on QEMU"?
 
I am running Xen and Linux inside a QEMU x86_64 emulated machine (nested
virt).