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Date: Tue, 12 Apr 2016 21:27:37 -0400 From: Boris Ostrovsky <boris.ostrovsky@...cle.com> To: Stefano Stabellini <sstabellini@...nel.org> Cc: 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 04/12/2016 07:15 PM, Stefano Stabellini wrote: > 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). This I, of course, never tried. But given that things work in a single-level virt, doesn't this imply that perhaps there is something in the emulation that's not quite right? -boris
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