linux-kernel - Re: [PATCH v3 3/5] x86/paravirt: Add paravirt_{read,write}

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Message-ID: <CALCETrVKM=gH_FjTzv=Xg6YCF8Ax_WJ+0RU9Zr7rNtDjadEgAg@mail.gmail.com>
Date:	Mon, 14 Mar 2016 09:53:34 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	xen-devel <Xen-devel@...ts.xen.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	X86 ML <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KVM list <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 3/5] x86/paravirt: Add paravirt_{read,write}_msr

On Mar 14, 2016 7:03 AM, "Paolo Bonzini" <pbonzini@...hat.com> wrote:
>
>
>
> On 11/03/2016 20:06, Andy Lutomirski wrote:
> > This adds paravirt hooks for unsafe MSR access.  On native, they
> > call native_{read,write}_msr.  On Xen, they use
> > xen_{read,write}_msr_safe.
> >
> > Nothing uses them yet for ease of bisection.  The next patch will
> > use them in rdmsrl, wrmsrl, etc.
> >
> > I intentionally didn't make them OOPS on #GP on Xen.  I think that
> > should be done separately by the Xen maintainers.
>
> Please do the same for KVM.

Can you clarify?  KVM uses the native version, and the native version
only oopses with this series applied if panic_on_oops is set.

--Andy