From mboxrd@z Thu Jan 1 00:00:00 1970 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 0DFCECCF2F6 for ; Mon, 19 Jan 2026 12:47:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5KdhsdJDk8SIToeoTJ04bKGX01lJQDTSPOhBJqAzOfE=; b=INHyu0pwR8y7Ml8A25Bub717vb 0wiRE/Cg/ctzii1QB2daYYb9jG49gB8n1XR7Uc67MOTc05zlOfK+M+0nNgaRdQInhgkDfnc9nqsZs piwiefR80G43q+HO4d//QXH1wma7VKudrkd35b5pfetWpExGigVcq9V9cI6ZY4aH7VCVoWeRHLFIN s97PexpUpz3XNgbhAGS72RfAB5jWLI82xqQXo2EPy8xweBDQHqannDKFbuXcY8vfO9c/ApI2gVtFR Ieb8lZzupfuvk9MEKLY8Zm1Lg3HK1xBo8PXOuHnlcvD9iHJ5rzGH2y37QKJ174ziXzFwNNglMGS/B KluW3J8w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vhof9-000000023E7-18ez; Mon, 19 Jan 2026 12:47:19 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vhof2-00000002389-27HF for linux-arm-kernel@lists.infradead.org; Mon, 19 Jan 2026 12:47:12 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id EC93460131; Mon, 19 Jan 2026 12:47:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 222CBC116C6; Mon, 19 Jan 2026 12:47:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768826831; bh=Ci8Yc7ndwDlszED/Qx1HGsS3eO9VUT9SMiftdYGNQu0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L+kax+mFuRN3ESDhczlAuyD1l3SxYTvc0LuBJJvNxSL9yW0Tmwni1tTupHx0CRQag 2ZUPTwTToR9s9KbzvtArqerdYpOdalYAD77fPrj5Ubpet1iEMLGKhd4m2vvm5Vhoty 4Ise9kfMx92nTCCN28VIngy4Vq8Yr7OLh0X2wg9uu7zH/1niw5c7B3LC/TfyVQtdUe wPfrxH4y8FfwKjw41yUL7+B40vcOxgggBIAGFrh2HLJr6FxzkFov5DAX5Sw5s6HZj5 EFxiHU8ceqqFbpA5XxE0tRcFBOcextPcLnPrIh7SFL3FGPDcrw6DIqUEw9pkp5AbcI LG06VOagfk4bQ== From: Will Deacon To: kvmarm@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Quentin Perret , Fuad Tabba , Vincent Donnefort , Mostafa Saleh Subject: [PATCH v2 06/35] KVM: arm64: Expose self-hosted debug regs as RAZ/WI for protected guests Date: Mon, 19 Jan 2026 12:45:59 +0000 Message-ID: <20260119124629.2563-7-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260119124629.2563-1-will@kernel.org> References: <20260119124629.2563-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 From: Fuad Tabba Debug and trace are not currently supported for protected guests, so trap accesses to the related registers and emulate them as RAZ/WI for now. Although this isn't strictly compatible with the architecture, it's sufficient for Linux guests and means that debug support can be added later on. Signed-off-by: Fuad Tabba Signed-off-by: Will Deacon --- arch/arm64/kvm/hyp/nvhe/sys_regs.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/sys_regs.c b/arch/arm64/kvm/hyp/nvhe/sys_regs.c index 3108b5185c20..c106bb796ab0 100644 --- a/arch/arm64/kvm/hyp/nvhe/sys_regs.c +++ b/arch/arm64/kvm/hyp/nvhe/sys_regs.c @@ -372,6 +372,14 @@ static const struct sys_reg_desc pvm_sys_reg_descs[] = { /* Cache maintenance by set/way operations are restricted. */ /* Debug and Trace Registers are restricted. */ + RAZ_WI(SYS_DBGBVRn_EL1(0)), + RAZ_WI(SYS_DBGBCRn_EL1(0)), + RAZ_WI(SYS_DBGWVRn_EL1(0)), + RAZ_WI(SYS_DBGWCRn_EL1(0)), + RAZ_WI(SYS_MDSCR_EL1), + RAZ_WI(SYS_OSLAR_EL1), + RAZ_WI(SYS_OSLSR_EL1), + RAZ_WI(SYS_OSDLR_EL1), /* Group 1 ID registers */ HOST_HANDLED(SYS_REVIDR_EL1), -- 2.52.0.457.g6b5491de43-goog