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Date: Wed, 17 Jun 2020 15:52:59 -0700
From: Nadav Amit <>
To: John Andersen <>
 Paolo Bonzini <>,
 Thomas Gleixner <>,
 mingo <>,
 bp <>,,,,,,
Subject: Re: [kvm-unit-tests PATCH] x86: Add control register pinning tests

> On Jun 17, 2020, at 3:46 PM, John Andersen <> wrote:
> Paravirutalized control register pinning adds MSRs guests can use to
> discover which bits in CR0/4 they may pin, and MSRs for activating
> pinning for any of those bits.

[ sni[

> +static void vmx_cr_pin_test_guest(void)
> +{
> +	unsigned long i, cr0, cr4;
> +
> +	/* Step 1. Skip feature detection to skip handling VMX_CPUID */
> +	/* nop */

I do not quite get this comment. Why do you skip checking whether the
feature is enabled? What happens if KVM/bare-metal/other-hypervisor that
runs this test does not support this feature?

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