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Re: [PATCH v6 00/51] x86: Try to wrangle PV clocks vs. TSC
- To: Kiryl Shutsemau <kas@xxxxxxxxxx>, Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Long Li <longli@xxxxxxxxxxxxx>, Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, John Stultz <jstultz@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stephen Boyd <sboyd@xxxxxxxxxx>, Miroslav Lichvar <mlichvar@xxxxxxxxxx>, x86@xxxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Michael Kelley <mhklinux@xxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Nikunj A Dadhania <nikunj@xxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- From: Sean Christopherson <seanjc@xxxxxxxxxx>
- Date: Thu, 10 Sep 2026 10:59:16 -0700
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- Delivery-date: Thu, 10 Sep 2026 17:59:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, Aug 06, 2026, Sean Christopherson wrote:
> The primary goal of this series to fix flaws with SNP and TDX guests where a
> PV clock provided by the untrusted hypervisor is used instead of the secure
> TSC that is controlled by trusted firmware.
>
> The secondary goal is modernize running under KVM. Currently, KVM guests will
> use TSC for clocksource, but not sched_clock. And Linux-as-a-KVM-guest
> doesn't
> support paravirt enumeration of the TSC/APIC frequencies, even though QEMU
> provides that information by default.
>
> The tertiary goal is to clean up the PV clock code to deduplicate logic across
> hypervisors, and to hopefully make it all easier to maintain going forward.
>
> The quaternary goal is to clean up the TSC calibration code, which was made
> stupidly hard to follow by hypervisor code mixing in with the native
> calibration routines, instead of being implemented as a pure alternative.
>
> Note, the VMware and Xen changes still probably should get acks from those
> maintainers, as my understanding of what they're trying to do may be flawed.
This (thankfully) still applies cleanly. What can I do to help move this
forward?
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