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

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Message-ID: <4d9be218-acf5-45a6-aeda-cee592fd74c8@email.android.com>
Date:	Thu, 24 Jan 2013 13:04:09 -0600
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Olaf Hering <olaf@...fle.de>, 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>
Subject: Re: [PATCH RESEND 1/1] X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts

Can't you discover Xen emulation by looking for Xen first?  Or does Xen go "stealth"?

Olaf Hering <olaf@...fle.de> wrote:

>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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