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Re: [Xen-devel] [PATCH v4 2/5] x86/msr: Carry on after a non-"safe" MSR access fails without !panic_on_oops
- To: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Mon, 14 Mar 2016 21:18:26 +0100
- Cc: KVM list <kvm@xxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, xen-devel <Xen-devel@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
- Delivery-date: Mon, 14 Mar 2016 20:19:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Mon, Mar 14, 2016 at 11:10:16AM -0700, Andy Lutomirski wrote:
> A couple of the wrmsr users actually care about performance. These
> are the ones involved in context switching and, to a lesser extent, in
> switching in and out of guest mode.
Right, this very much includes a number of perf MSRs. Some of those get
called from the context switch path, others from the NMI handler.
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