linux-kernel - Re: [PATCH 0/2] KVM: kvm-coco-queue: Support protected TSC

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Message-ID: <Z9N7n903V6Xz/gKj@ls.amr.corp.intel.com>
Date: Thu, 13 Mar 2025 17:43:11 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Isaku Yamahata <isaku.yamahata@...el.com>, kvm@...r.kernel.org,
	pbonzini@...hat.com, Sean Christopherson <seanjc@...gle.com>,
	chao.gao@...el.com, rick.p.edgecombe@...el.com,
	yan.y.zhao@...el.com, linux-kernel@...r.kernel.org,
	isaku.yamahata@...il.com, Nikunj A Dadhania <nikunj@....com>
Subject: Re: [PATCH 0/2] KVM: kvm-coco-queue: Support protected TSC

On Tue, Mar 11, 2025 at 10:13:30PM -0300,
Marcelo Tosatti <mtosatti@...hat.com> wrote:

> On Sat, Oct 12, 2024 at 12:55:54AM -0700, Isaku Yamahata wrote:
> > This patch series is for the kvm-coco-queue branch.  The change for TDX KVM is
> > included at the last.  The test is done by create TDX vCPU and run, get TSC
> > offset via vCPU device attributes and compare it with the TDX TSC OFFSET
> > metadata.  Because the test requires the TDX KVM and TDX KVM kselftests, don't
> > include it in this patch series.
> 
> OK, previous results were incorrect. In fact, this patches (which apply
> cleanly to current kvm-coco-queue) reduce cyclictest latency from:

Thank you for evaluating it.  Does your guest include [1] (or similar fix)?
The patch would affect the result much.

[1] https://lore.kernel.org/lkml/20250228014416.3925664-1-vannapurve@google.com/
-- 
Isaku Yamahata <isaku.yamahata@...el.com>