From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (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 D719B3D34B9; Fri, 21 Aug 2026 22:31:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787351470; cv=none; b=j8Ga9BIqffgbcGPiJHpVwOxNyrLLVxOqhHOgP4DHPd8NB9oyA2c7z9V+35+ug2Y4hb+sctdumHRP0mb/Fm6hKJ5jfJ7EE0ij1KpnbAWy6utawe5B54UVbn2Q1woUfwKCa5a/11m36d3PawtupyMqoyXgXfTb3mbRuFwhPVpJau8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787351470; c=relaxed/simple; bh=upuespX5CuZ22nzOyqZKJBfoV85lZn9Vv0+7Y2fIM80=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NEFxt9l8ig7uPv55M0d654Yg6NLujsjAv8Cvz8WIv+L3G3GxLuGgv4hoRUEHSQNc9WOv/uB1FQ631GLxKgQTxVfoXEPXMskpRbcbOVVwoDtIEyvqHYGJ0t888sLiwQ1jilIKRHAKKw5V82cORW/SzxgFJWI+eryfHzilGpQtG60= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=fnYa9cVg; arc=none smtp.client-ip=192.198.163.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="fnYa9cVg" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1787351468; x=1818887468; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=upuespX5CuZ22nzOyqZKJBfoV85lZn9Vv0+7Y2fIM80=; b=fnYa9cVgArQIXA3lrH/S1u2iFGYUwETOsY4gBQWAeH2TDpSI/aeFF/nH Hmj2/LDY08pdMDWXOzGU1R3+UP2kK2wVcBYNB2dHgi4+7X6ojnfVc6NAy W2PY1Me6L0LyE4zVeVF75fCwHd0FBz6duvL2MKqGQur/c9v3EIA58WaXW lRSF7NWO8osjqVk7paC1tyun/vClevEGrLw/RaCajAE8Gd0nzBdjm4++m Elb271lri4sz7N/4zJ2nKLThbEtegz3ct9MjZdKNo2SsdFxijAf76HNT8 Pr7x2wIxwoWI2uqi9AtJLg0FUFXy/E2s1hsqKxKZmtcXJ9KcmH7WUKDMt A==; X-CSE-ConnectionGUID: NVCQPbAHS8qfBn4t9nWAWQ== X-CSE-MsgGUID: i4z/IiAWQYCrBwAx7LC7mA== X-IronPort-AV: E=McAfee;i="6800,10657,11882"; a="88032656" X-IronPort-AV: E=Sophos;i="6.25,235,1779174000"; d="scan'208";a="88032656" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Aug 2026 15:30:52 -0700 X-CSE-ConnectionGUID: NxCwRNupQtai6cBsB/6vig== X-CSE-MsgGUID: y1x4pJPmTgunX95JSC0MPA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,235,1779174000"; d="scan'208";a="271679807" Received: from 9cc2c43eec6b.jf.intel.com ([10.54.77.29]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Aug 2026 15:30:52 -0700 From: Zide Chen To: Sean Christopherson , Paolo Bonzini , Peter Zijlstra Cc: kvm@vger.kernel.org, Andi Kleen , Jim Mattson , Stephane Eranian , linux-kernel@vger.kernel.org, Mingwei Zhang , Zide Chen , Das Sandipan , Shukla Manali , Dapeng Mi , Xudong Hao Subject: [PATCH 19/23] KVM: x86/pmu: Always intercept GLOBAL_INUSE under PerfMon masking Date: Fri, 21 Aug 2026 15:19:58 -0700 Message-ID: <20260821222002.54907-20-zide.chen@intel.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260821222002.54907-1-zide.chen@intel.com> References: <20260821222002.54907-1-zide.chen@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Unlike IA32_PERF_GLOBAL_CTRL, hardware does not filter GLOBAL_INUSE reads based on the PerfMon mask at all, so always intercept this MSR and filter out host-owned bits in KVM. Signed-off-by: Zide Chen --- arch/x86/kvm/vmx/vmx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index a241efb99b3d..2bd1ffe65510 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -4339,8 +4339,15 @@ static void vmx_recalc_pmu_msr_intercepts(struct kvm_vcpu *vcpu) MSR_TYPE_RW, intercept); vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_GLOBAL_STATUS_SET, MSR_TYPE_RW, intercept || pmu->version < 4); + + /* + * IA32_PERF_GLOBAL_INUSE reads are not subject to PerfMon mask + * filtering. + */ vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_GLOBAL_INUSE, - MSR_TYPE_RW, intercept || pmu->version < 4); + MSR_TYPE_RW, + intercept || kvm_vcpu_has_perfmon_mask(vcpu) || + pmu->version < 4); intercept = !has_mediated_pmu || !kvm_vcpu_has_perf_metrics(vcpu); vmx_set_intercept_for_msr(vcpu, MSR_PERF_METRICS, -- 2.55.0