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Re: [PATCH v4 04/30] KVM: x86: Add KVM_[GS]ET_CLOCK_GUEST for accurate KVM clock migration
- To: Dongli Zhang <dongli.zhang@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx
- From: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
- Date: Wed, 20 May 2026 15:08:52 +0100
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- Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, x86@xxxxxxxxxx, Marc Zyngier <maz@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>, Jonathan Cameron <jic23@xxxxxxxxxx>, Sascha Bischoff <Sascha.Bischoff@xxxxxxx>, Jack Allister <jalliste@xxxxxxxxxx>, Joey Gouly <joey.gouly@xxxxxxx>, joe.jin@xxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx
- Delivery-date: Wed, 20 May 2026 14:09:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, 2026-05-19 at 16:34 -0700, Dongli Zhang wrote:
>
> I would really appreciate it if this document could be revived. I don't see it
> in your most recent v4 PATCH 7. It is very helpful as a guideline for how
> userspace VMMs should take advantage of these APIs.
In the kvmclock5 branch I'm revising for the next round.
https://git.infradead.org/?p=users/dwmw2/linux.git;a=commitdiff;h=ae872d9b75
Now has a selftest which serves as an example of the process that was
documented. And an extra fix right before it in the tree, to update the
master clock on vCPU creation because otherwise otherwise KVM_GET_CLOCK
wasn't returning the host_tsc.
I think I need to change that to only do so if ka->use_master_clock
isn't *already* set though, or we risk introducing discrepancies on
hotplug again? Will tweak that...
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