Re: [PATCH v4 0/3] Allow user space to restrict and augment MSR emulation

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To: "Graf (AWS), Alexander" <graf@xxxxxxxxx>
Subject: Re: [PATCH v4 0/3] Allow user space to restrict and augment MSR emulation
From: Jim Mattson <jmattson@xxxxxxxxxx>
Date: Wed, 19 Aug 2020 15:09:04 -0700
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Sean Christopherson <sean.j.christopherson@xxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "Raslan, KarimAllah" <karahmed@xxxxxxxxx>, Aaron Lewis <aaronlewis@xxxxxxxxxx>, kvm list <kvm@xxxxxxxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx" <linux-doc@xxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <B0FD5408-E2C1-444C-AFCE-7C622EA75F66@amazon.de>
References: <20200803211423.29398-1-graf@amazon.com> <CALMp9eRHmhmKP21jmBr13n3DvttPg9OQEn5Zn0LxyiKiq2uTkA@mail.gmail.com> <B0FD5408-E2C1-444C-AFCE-7C622EA75F66@amazon.de>

On Wed, Aug 19, 2020 at 2:46 PM Graf (AWS), Alexander <graf@xxxxxxxxx> wrote:

> Special MSRs like EFER also irritate me a bit. We can't really trap on them - most code paths just know they're handled in kernel. Maybe I'll add some sanity checks as well...

Why can't we intercept EFER?

Follow-Ups:
- Re: [PATCH v4 0/3] Allow user space to restrict and augment MSR emulation
  - From: Jim Mattson

References:
- [PATCH v4 0/3] Allow user space to restrict and augment MSR emulation
  - From: Alexander Graf
- Re: [PATCH v4 0/3] Allow user space to restrict and augment MSR emulation
  - From: Jim Mattson
- Re: [PATCH v4 0/3] Allow user space to restrict and augment MSR emulation
  - From: Graf (AWS), Alexander

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