linux-kernel - Re: [PATCH] KVM: x86: Fix perfctr WRMSR for running counters

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Message-ID: <CAOyeoRVaV3Dh=M4ioiT3DU+p5ZnQGRcy9_PssJZ=a36MhL-xHQ@mail.gmail.com>
Date:   Wed, 29 Jan 2020 17:09:56 -0800
From:   Eric Hankland <ehankland@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Jim Mattson <jmattson@...gle.com>, Peter Shier <pshier@...gle.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Fix perfctr WRMSR for running counters

Sorry - I forgot to switch to plain text mode on my first reply.

> I think this best written as it was before commit 2924b52117:
>
>                         if (!msr_info->host_initiated)
>                                 data = (s64)(s32)data;
>                         pmc->counter += data - pmc_read_counter(pmc);
Sounds good to me.

> Do you have a testcase?
I added a testcase to kvm-unit-tests/x86/pmu.c that fails without this
patch and passes with it.
Should I send out that patch now?