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From: Sean Christopherson <seanjc@google.com>
To: Like Xu <like.xu.linux@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/7] KVM: x86/pmu: Avoid setting BIT_ULL(-1) to pmu->host_cross_mapped_mask
Date: Thu, 22 Sep 2022 22:30:39 +0000	[thread overview]
Message-ID: <YyziD28RXkBugT8e@google.com> (raw)
In-Reply-To: <20220831085328.45489-2-likexu@tencent.com>

On Wed, Aug 31, 2022, Like Xu wrote:
> +		hw_idx = pmc->perf_event->hw.idx;
> +		/* make it a little less dependent on perf's exact behavior */

Reworded this to explain how a negative value can be encountered.

> +		if (hw_idx != pmc->idx && hw_idx > -1)
> +			pmu->host_cross_mapped_mask |= BIT_ULL(hw_idx);
>  	}
>  }

  reply	other threads:[~2022-09-22 22:30 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-31  8:53 [PATCH v3 0/7] x86/pmu: Corner cases fixes and optimization Like Xu
2022-08-31  8:53 ` [PATCH v3 1/7] KVM: x86/pmu: Avoid setting BIT_ULL(-1) to pmu->host_cross_mapped_mask Like Xu
2022-09-22 22:30   ` Sean Christopherson [this message]
2022-08-31  8:53 ` [PATCH v3 2/7] KVM: x86/pmu: Don't generate PEBS records for emulated instructions Like Xu
2022-08-31  8:53 ` [PATCH v3 3/7] KVM: x86/pmu: Avoid using PEBS perf_events for normal counters Like Xu
2022-09-22 22:35   ` Sean Christopherson
2022-08-31  8:53 ` [PATCH v3 4/7] KVM: x86/pmu: Defer reprogram_counter() to kvm_pmu_handle_event() Like Xu
2022-09-22 23:18   ` Sean Christopherson
2022-08-31  8:53 ` [PATCH v3 5/7] KVM: x86/pmu: Defer counter emulated overflow via pmc->prev_counter Like Xu
2022-09-22 23:59   ` Sean Christopherson
2022-10-14  8:08     ` Like Xu
2022-08-31  8:53 ` [PATCH v3 6/7] KVM: x86/svm/pmu: Direct access pmu->gp_counter[] to implement amd_*_to_pmc() Like Xu
2022-08-31  8:53 ` [PATCH v3 7/7] KVM: x86/svm/pmu: Rewrite get_gp_pmc_amd() for more counters scalability Like Xu
2022-09-07  9:52 ` [PATCH v3 0/7] x86/pmu: Corner cases fixes and optimization Like Xu
2022-09-19  8:58   ` Like Xu
2022-09-22 22:29 ` Sean Christopherson
2022-09-22 23:11   ` Sean Christopherson

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