linux-kernel - Re: [PATCH 0/3] x86/paravirt: Fix baremetal paravirt MSR ops

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Message-ID: <55FAA6AE.9050503@redhat.com>
Date:	Thu, 17 Sep 2015 13:40:30 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>
Cc:	x86@...nel.org, KVM list <kvm@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	xen-devel <Xen-devel@...ts.xen.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] x86/paravirt: Fix baremetal paravirt MSR ops



On 17/09/2015 10:58, Peter Zijlstra wrote:
> But the far greater problem I have with the whole virt thing is that
> you cannot use rdmsr_safe() to probe if an MSR exists at all because, as
> you told me, these virt thingies return 0 for all 'unknown' MSRs instead
> of faulting.

At least for KVM, that behavior is opt-in (the ignore_msrs parameter)
and no distro that I know enables it by default.

Paolo
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