From patchwork Wed May 4 11:28:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sai Prakash Ranjan X-Patchwork-Id: 12837703 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B87C6C433F5 for ; Wed, 4 May 2022 11:32:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ALfbQc3yTIUohKHVvO4vblK/hx3MBDq/mmJqjWDjGSY=; b=JgUHRaJIt4QPUJ 6b9Ro9El9r0XnDFKUJQuUM48V6SF3eO9pZVKZ28yea6hE6U4/9PYBPMjEu8okiJpw8QhmebCbsH4p zuh9QK41YMDVSuq9EtluQvRe5TztkRXMI85DFb6bqKXnirQUEaQcvv4hn/Ee/qlrd5hK7bfk15Jlk csbiMpgp/uWP1H2bNvMD/Q5p6Tr02i02CczpPRVxXwNTJsKCUJkL5d/ddKCcYNU4LLfCjIfNE6jhD 2Te8/A7UuEFc7DJBB/22d3GcA2JOez0TA4Wf7TXdHy/mVJCmGWMSZ6ouOdt/1jOtkuBU+gXn3mbgN Kbfs1N3JZ/dGrMWBOTaA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmDE9-00AQw3-KP; Wed, 04 May 2022 11:31:29 +0000 Received: from alexa-out.qualcomm.com ([129.46.98.28]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmDCA-00APwz-KA for linux-arm-kernel@lists.infradead.org; Wed, 04 May 2022 11:29:27 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1651663766; x=1683199766; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=K4dbklDrBN0007czk1A8uvXlWciPzpruZ8ED1Gjwyzc=; b=TYsU0vvWCZO7ijppdryOxfTOo5sZBgoMLM7SPpNBYMPR27DxZPEbcNhI pjIRbujK5W6dUzGRQY0EwgRvFWGEHA+2p2OATwoN0Z27OWjmIJoVWYGG/ hR+cpzLU5fJblTPO9Nyxh8NhCSLjFjgc0oR1Whk+GNQQFk+GllmW5ksy0 c=; Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 04 May 2022 04:29:26 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 May 2022 04:29:25 -0700 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 4 May 2022 04:29:25 -0700 Received: from blr-ubuntu-253.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 4 May 2022 04:29:21 -0700 From: Sai Prakash Ranjan To: , , CC: , , , , , , , , Sai Prakash Ranjan Subject: [PATCHv14 6/9] KVM: arm64: Add a flag to disable MMIO trace for nVHE KVM Date: Wed, 4 May 2022 16:58:25 +0530 Message-ID: <1517201c3424214edd2d5385eeb10ac106b67d1c.1651663123.git.quic_saipraka@quicinc.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220504_042926_736990_0412EB82 X-CRM114-Status: GOOD ( 11.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a generic flag (__DISABLE_TRACE_MMIO__) to disable MMIO tracing in nVHE KVM as the tracepoint and MMIO logging symbols should not be visible at nVHE KVM as there is no way to execute them. It can also be used to disable MMIO tracing for specific drivers. Signed-off-by: Sai Prakash Ranjan --- arch/arm64/kvm/hyp/nvhe/Makefile | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index f9fe4dc21b1f..87d22a18b7a5 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -4,7 +4,12 @@ # asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS + +# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as +# there is no way to execute them and any such MMIO access from nVHE KVM +# will explode instantly (Words of Marc Zyngier). So introduce a generic flag +# __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM. +ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__ hostprogs := gen-hyprel HOST_EXTRACFLAGS += -I$(objtree)/include