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[PATCH 0/2] time: fix time accounting for x86 HVM guests
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Tue, 14 Apr 2026 12:33:25 +0200
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, 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 10:34:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
xen/arch/arm/time.c | 4 ++--
xen/arch/riscv/time.c | 2 +-
xen/arch/x86/time.c | 20 ++++++++++++++------
3 files changed, 17 insertions(+), 9 deletions(-)
--
2.53.0
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