From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (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 23BA910A0F; Fri, 26 Jan 2024 08:56:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706259412; cv=none; b=TB8PJLWiqjwseo736AK/haPzw++RBu0x/uWcm9p1Q+MydzdURLhRl0m/Ci9xu9E38beVFHqvTpOahLLFSz6IfX2DYSxhyxPWeEzjnzLh6prErdL7t1BR5l4M4gzMfWg6G+ZWGHJA7uDkzWBGN2hJseng6zWoG0MrgVaM6lfhsqM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706259412; c=relaxed/simple; bh=QglvaqOiccK1QoUItcblJF4VkLMkGcShw3WGx+q7c0A=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=g3zcOGotuFu8ibhhmCj1myU5tFVqxOC1A6GooKeHDozh4MiWbo7Fxh8LYwrnh2fVBWbljuFiWKnL7OX5pOjwx9oxP/bWNPQeQtStqPRrLvV99Pv2ojI8PLsR2uaM9kHbRCiusf46nxzP6MMg8l0Z0/NdYi161OqsObr7di6avSQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ZDZEQGzx; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="ZDZEQGzx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706259411; x=1737795411; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=QglvaqOiccK1QoUItcblJF4VkLMkGcShw3WGx+q7c0A=; b=ZDZEQGzxB+DwqHhS/sTqW3jq9MTYXu33vQCrVeR4jMhp8b5VOGKQ2jgO ZtAQH+nGl0189cdIphReGwB66YfMjoG9pUUeA+uXG26tDoRofOheNWy1C IoWuW50m0ntHr/9cf5fxXYR79whdfi5OY3z0s9/2p2hOHb5PcdNCXYkcI YpnQJ+WrJ+m/OrVa8BxkbAW792gxrBJL/Edi1HuDwyCk3eOtsuX6vCyKN IZyYvQCVsMblvmCU88iL8K703xXWbWaPyRTzjC7lCUKZUmp4ddDIEl6Or 7zqzsETNOWxzaZMLKIVoBSWY0VNvQjh6Iyw0yplyCrBa3CAVlmgBeTmfE w==; X-IronPort-AV: E=McAfee;i="6600,9927,10964"; a="9792278" X-IronPort-AV: E=Sophos;i="6.05,216,1701158400"; d="scan'208";a="9792278" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2024 00:56:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10964"; a="930310047" X-IronPort-AV: E=Sophos;i="6.05,216,1701158400"; d="scan'208";a="930310047" Received: from yanli3-mobl.ccr.corp.intel.com (HELO xiongzha-desk1.ccr.corp.intel.com) ([10.254.213.178]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2024 00:56:41 -0800 From: Xiong Zhang To: seanjc@google.com, pbonzini@redhat.com, peterz@infradead.org, mizhang@google.com, kan.liang@intel.com, zhenyuw@linux.intel.com, dapeng1.mi@linux.intel.com, jmattson@google.com Cc: kvm@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, zhiyuan.lv@intel.com, eranian@google.com, irogers@google.com, samantha.alt@intel.com, like.xu.linux@gmail.com, chao.gao@intel.com, xiong.y.zhang@linux.intel.com, Xiong Zhang Subject: [RFC PATCH 14/41] KVM: x86/pmu: Allow RDPMC pass through Date: Fri, 26 Jan 2024 16:54:17 +0800 Message-Id: <20240126085444.324918-15-xiong.y.zhang@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240126085444.324918-1-xiong.y.zhang@linux.intel.com> References: <20240126085444.324918-1-xiong.y.zhang@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Mingwei Zhang Clear RDPMC_EXITING in vmcs cpu based execution control to allow rdpmc instruction to proceed without VMEXIT. This gives performance to passthrough PMU. Clear RDPMC in vmx_vcpu_after_set_cpuid() when guest enables PMU and passthrough PMU is allowed. The passthrough RDPMC allows guest to read several PMU MSRs including unexposed counters like fixed counter 3 as well as IA32_PERF_METRICS. To cope with this issue, these MSRs will be cleared in later commits when context switching to VM guest. Co-developed-by: Xiong Zhang Signed-off-by: Xiong Zhang Signed-off-by: Mingwei Zhang --- arch/x86/kvm/vmx/vmx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index e4610b80e519..33cb69ff0804 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7819,6 +7819,9 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) vmx->msr_ia32_feature_control_valid_bits &= ~FEAT_CTL_SGX_LC_ENABLED; + if (is_passthrough_pmu_enabled(&vmx->vcpu)) + exec_controls_clearbit(vmx, CPU_BASED_RDPMC_EXITING); + /* Refresh #PF interception to account for MAXPHYADDR changes. */ vmx_update_exception_bitmap(vcpu); } -- 2.34.1