linux-kernel - RE: [PATCH 1/1] X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts

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Date:	Fri, 18 Jan 2013 15:27:33 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	"Konrad Wilk (konrad.wilk@...cle.com)" <konrad.wilk@...cle.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"Jan Beulich (JBeulich@...e.com)" <JBeulich@...e.com>
Subject: RE: [PATCH 1/1] X86: Handle Hyper-V vmbus interrupts as special
 hypervisor interrupts



> -----Original Message-----
> From: Borislav Petkov [mailto:bp@...en8.de]
> Sent: Friday, January 18, 2013 8:11 AM
> To: KY Srinivasan
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> jasowang@...hat.com; tglx@...utronix.de; H. Peter Anvin; Ingo Molnar
> Subject: Re: [PATCH 1/1] X86: Handle Hyper-V vmbus interrupts as special
> hypervisor interrupts
> 
> On Thu, Jan 17, 2013 at 04:39:37PM -0800, K. Y. Srinivasan wrote:
> >
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > ---
> >  arch/x86/include/asm/irq_vectors.h |    2 +
> >  arch/x86/include/asm/mshyperv.h    |    4 +++
> >  arch/x86/kernel/cpu/mshyperv.c     |   39
> ++++++++++++++++++++++++++++++++++++
> >  arch/x86/kernel/entry_32.S         |    7 ++++++
> >  arch/x86/kernel/entry_64.S         |    5 ++++
> >  5 files changed, 57 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/x86/include/asm/irq_vectors.h
> b/arch/x86/include/asm/irq_vectors.h
> > index 1508e51..c2ff239 100644
> > --- a/arch/x86/include/asm/irq_vectors.h
> > +++ b/arch/x86/include/asm/irq_vectors.h
> > @@ -112,6 +112,8 @@
> >  /* Xen vector callback to receive events in a HVM domain */
> >  #define XEN_HVM_EVTCHN_CALLBACK		0xf3
> >
> > +/* Hyper-V vector callback to receive vmbus interrupts*/
> > +#define HYPER_V_CALLBACK_VECTOR		0xf2
> 
> Btw, could those hypervisor vectors be merged into one VIRT_INTR_VECTOR
> and be shared between the hypervisors? I mean, you can't have a xen and
> hyperv hypervisor running next to each other and fihgting over that
> vector, right?

You are right; we could just have one vector for this. Let me wait for other comments and
input from Xen maintainers before I make this change.

Regards,

K. Y
> 
> --
> Regards/Gruss,
>     Boris.
> 
> Sent from a fat crate under my desk. Formatting is fine.
> --
>