linux-kernel - Re: [PATCH v2] x86/msr: Allow unprivileged read access to some MSRs

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Date:   Tue, 30 May 2023 09:56:21 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Tim Wiederhake <twiederh@...hat.com>
Cc:     Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2] x86/msr: Allow unprivileged read access to some MSRs

On Tue, May 30, 2023 at 3:28 AM Tim Wiederhake <twiederh@...hat.com> wrote:
>
> Software such as qemu and libvirt require the raw content of some MSRs

Note that KVM doesn't return the raw value of IA32_ARCH_CAPABILITIES.
First, it filters out unsupported bits, and then it massages the
result a bit. See kvm_get_arch_capabilities(). Isn't this what qemu
actually wants?