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

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Message-ID: <20130124185943.GA19194@aepfle.de>
Date:	Thu, 24 Jan 2013 19:59:43 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Jan Beulich <JBeulich@...e.com>, "bp@...en8.de" <bp@...en8.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>
Subject: Re: [PATCH RESEND 1/1] X86: Handle Hyper-V vmbus interrupts as
 special hypervisor interrupts

On Thu, Jan 24, KY Srinivasan wrote:


> > Question is - considering you stated that this is supported
> > starting in Win8, doesn't Hyper-V itself announce that
> > capability in some explicit way?
> 
> Thanks Jan. Unfortunately I don't think tis interrupt delivery model
> is specified via a "feature" bit (I will check with the Windows guys).
> Perhaps, we can have a Hyper-V specific compilation switch to address
> the Xen emulation issue.

Would that really help if both pvops XEN_PVHVM and HYPERV are enabled in
the config? I assume at this point the access to the DMI data is not yet
possible.

Olaf
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