linux-kernel - Re: [RFC PATCH 0/7] KVM: Fix tick-based vtime accounting on x86

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Message-ID: <87wnt4vkij.ffs@nanos.tec.linutronix.de>
Date:   Wed, 14 Apr 2021 19:33:24 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Michael Tokarev <mjt@....msk.ru>
Subject: Re: [RFC PATCH 0/7] KVM: Fix tick-based vtime accounting on x86

On Tue, Apr 13 2021 at 11:29, Sean Christopherson wrote:
> This is an alternative to Wanpeng's series[*] to fix tick-based accounting
> on x86.  The approach for fixing the bug is identical: defer accounting
> until after tick IRQs are handled.  The difference is purely in how the
> context tracking and vtime code is refactored in order to give KVM the
> hooks it needs to fix the x86 bug.
>
> x86 compile tested only, hence the RFC.  If folks like the direction and
> there are no unsolvable issues, I'll cross-compile, properly test on x86,
> and post an "official" series.

I like the final outcome of this, but we really want a small set of
patches first which actually fix the bug and is easy to backport and
then the larger consolidation on top.

Can you sort that out with Wanpeng please?

Thanks,

        tglx