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Re: [PATCH 0/2] time: fix time accounting for x86 HVM guests
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Date: Tue, 14 Apr 2026 13:08:22 -0700 (PDT)
- Authentication-results: eu.smtp.expurgate.cloud; dkim=pass header.s=k20201202 header.d=kernel.org header.i="@kernel.org" header.h="Date:From:To:cc:Subject:In-Reply-To:References"
- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Tue, 14 Apr 2026 20:08:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, 14 Apr 2026, Roger Pau Monne wrote:
> Hello,
>
> When not emulating the TSC the guest time value calculated by using the
> vCPU time info page in HVM mode would drift between time synchronization
> intervals. First patch fixes the drift, second patch makes the
> calculation of cpu_khz round up the value for better accuracy.
>
> Thanks, Roger.
>
> Roger Pau Monne (2):
> x86/time: use native TSC scaling factors when TSC is not scaled
> xen/cpu: round up cpu_khz calculations
Thanks Roger, this fixed an outstanding bug I was seeing!
Tested-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
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