linux-kernel - Re: [PATCH v7 2/2] KVM: x86/xen: update Xen CPUID Leaf 4 (tsc info) sub-leaves, if present

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Message-ID: <477edcdff6507e35793c1cb9a97101d01425cff9.camel@infradead.org>
Date:   Wed, 11 Jan 2023 10:00:50 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Paul Durrant <pdurrant@...zon.com>, x86@...nel.org,
        kvm@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v7 2/2] KVM: x86/xen: update Xen CPUID Leaf 4 (tsc info)
 sub-leaves, if present

On Fri, 2023-01-06 at 10:36 +0000, Paul Durrant wrote:
> The scaling information in subleaf 1 should match the values set by KVM in
> the 'vcpu_info' sub-structure 'time_info' (a.k.a. pvclock_vcpu_time_info)
> which is shared with the guest, but is not directly available to the VMM.
> The offset values are not set since a TSC offset is already applied.
> The TSC frequency should also be set in sub-leaf 2.
> 
> Signed-off-by: Paul Durrant <pdurrant@...zon.com>
> ---

Reviewed-by: David Woodhouse <dwmw@...zon.co.uk>

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