From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D35DF2949E0; Wed, 6 May 2026 01:58:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778032683; cv=none; b=OTnh4Rlk9+9o+jONWBOz7cn7sZeDtrHj1zvbuwaH/kS0iI843yS2T0i9ZXzm5w1lP4NHKEMpvEGs3Qe5L5xXZK1Ab7d1V9ZTQA82bzm4fxXax7PZdNeJgmhPXmCnhgtI0gVjCc4zYJM+ixJlQR8GwsVJTXfVskm3p9S5fksBabk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778032683; c=relaxed/simple; bh=443kmV2JABqO+wrTnYMBhbBvjwSW6NmQa1jp4Q2mwMU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ewusgr3Da8utZpCp4rdhVpQs0rst79nL8ahlTHv2veniaSGdbTUYJ0uUBRR0eQQ7YVXiIsz4KztDCn8sjwTh95dUZTGXhZVFyWa5HnA2k3W2u7TrSktIhvFTKG2aghYgJrqVaKxp1AaRaGr4Wrh6XNaTC3+5IGJAv9HXlzXxeyc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ogj5zDMR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ogj5zDMR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D4B9C2BCC9; Wed, 6 May 2026 01:58:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778032683; bh=443kmV2JABqO+wrTnYMBhbBvjwSW6NmQa1jp4Q2mwMU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ogj5zDMR1dyZAwlQyY2gthesC8Cv+VHcZ11BVBGZ/WNGGZeHM28FokG+T64LsU3J5 6w3sCXRKKF+O2P4Rib4W7m382T5oRzE2IJswPQ+HlQBsmELXFPoWJ4joDpxYLzvAC+ 0E3OyfzhrveK92o2skjeZgmZD0OYerUA3KYNT2Z31LvG0m3aJnX+aYWSKWJ+GJhJMr V7fyDd+ydZf6bltYJ6/2VaZG5k934tL9xuYd7HhQS7G0UzTP3ghCv0oB8l9FYPl0JX AK5CoSxGOnIfjz1GPaSj0mQdUXtpf7C8EvxCaogQRLqXGx5tu8UB+PHBkV8I9h1NMF UIIUB2HDlg6pA== From: Yosry Ahmed To: Sean Christopherson Cc: Paolo Bonzini , Jim Mattson , Dapeng Mi , Sandipan Das , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Yosry Ahmed Subject: [PATCH v6 06/16] KVM: x86/pmu: Do a single atomic OR when reprogramming counters Date: Wed, 6 May 2026 01:57:22 +0000 Message-ID: <20260506015733.1671124-7-yosry@kernel.org> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog In-Reply-To: <20260506015733.1671124-1-yosry@kernel.org> References: <20260506015733.1671124-1-yosry@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Do a single atomic OR using the atomic overlay of reprogram_pmi bitmask, instead of one atomic set_bit() call per counter. Signed-off-by: Yosry Ahmed --- arch/x86/kvm/pmu.h | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index f8286067722b0..0e99022168a85 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -213,13 +213,10 @@ static inline void kvm_pmu_request_counter_reprogram(struct kvm_pmc *pmc) static inline void kvm_pmu_request_counters_reprogram(struct kvm_pmu *pmu, u64 counters) { - int bit; - if (!counters) return; - for_each_set_bit(bit, (unsigned long *)&counters, X86_PMC_IDX_MAX) - set_bit(bit, pmu->reprogram_pmi); + atomic64_or(counters, &pmu->__reprogram_pmi); kvm_make_request(KVM_REQ_PMU, pmu_to_vcpu(pmu)); } -- 2.54.0.545.g6539524ca2-goog