linux-kernel - Re: [PATCH 4/4] x86: properly handle kvm emulation of hyperv

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Message-ID: <51F0DAD1.8080108@redhat.com>
Date:	Thu, 25 Jul 2013 09:59:13 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	KY Srinivasan <kys@...rosoft.com>,
	Jason Wang <jasowang@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"gleb@...hat.com" <gleb@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] x86: properly handle kvm emulation of hyperv

Il 24/07/2013 23:37, H. Peter Anvin ha scritto:
> What I'm suggesting is exactly that except that the native hypervisor is later in CPUID space.

Me too actually.

I was just suggesting an implementation of the idea (that takes into
account hypervisors detected by other means than CPUID).

Paolo

> KY Srinivasan <kys@...rosoft.com> wrote:
>> As Paolo suggested if there were some priority encoded, the guest could make an
>> informed decision. If the guest under question can run on both hypervisors A and B,
>> we would rather the guest discover hypervisor A when running on A and
>> hypervisor B when running on B. The priority encoding could be as simple as
>> surfacing the native hypervisor signature earlier in the CPUID space.

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