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 72DA610ED679 for ; Fri, 27 Mar 2026 14:01:22 +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=CgJ7zzrUW2V45knd7wTngmEu7ELXc1m/JD3T7B10AxM=; b=yGg7cmG+0HtDLyzG8fxy6r8Ksr nWu50Vtu2cW6uyx4Gh9mI16waW1CmXOXrwiZJ+gFKYnQ9wkW0nSRqHS1SjlbpPbDFaH7ss/2ciSgl kdyw2iKNvpjgRnUqpK6T/t0eFYvJ5IY3Bxfd0FYPMTQCx6oo8E/vhKYypT7dRXs9fhev+bkExniYv ws9A82cHLpoMzuu04CKg89QLH2jXQ57I9hfmtWQk79qGBDKH9USnyoTybCQSndFIuJKfIijMNr/3H iCde4twpaThmwg8EqL2bJmgNBxaQ7ahNboevTjN1lBkTrclJE/Qjp3nkp+B7XE93Qdtn/pQC/jrca +yKO7ovw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w67kT-00000007VaX-3iaV; Fri, 27 Mar 2026 14:01:17 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w67kN-00000007VXh-1H6u for linux-arm-kernel@lists.infradead.org; Fri, 27 Mar 2026 14:01:12 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 010674332E; Fri, 27 Mar 2026 14:01:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2AC2AC19423; Fri, 27 Mar 2026 14:01:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774620070; bh=ow7XJsMmy3N9br36ooPJfkzHGKyMX+Ym+pCiAfKaBdg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fpdPJ9rE4C5ofwCxzMs7Rwxv0FmPNhAVVzrGNogUIMJsH8eZA+AFXT2Avk+4I4e7y HP5ppWyaymTseJfGmYRfK7XqfmogtEJb2VKCQCOvu6s5X19/kJ2WiXy+YEiYIYNp3q WXKv1yS1Oar9YDC9Q+3pQG8EAZDdArY+smPLKW/v/NRtQCHNQk3qJ8M0gLLEatx/3M 2HHxoLFde0BzYGEI5q0YEvNcTQ47CN4AirPAXRA39FXahTCcdcwirM+OJPsp6svLwb RCRyRCpjUCFXw+Cfn+Gp5h329VelFFptXbmiPOSS+PoitdrijKdwlrpt1fqsnnwbdz 3c2f1mdmFvMaw== 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 , Alexandru Elisei Subject: [PATCH v4 06/38] KVM: arm64: Expose self-hosted debug regs as RAZ/WI for protected guests Date: Fri, 27 Mar 2026 14:00:05 +0000 Message-ID: <20260327140039.21228-7-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260327140039.21228-1-will@kernel.org> References: <20260327140039.21228-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260327_070111_367397_8B581654 X-CRM114-Status: UNSURE ( 9.72 ) X-CRM114-Notice: Please train this message. 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. Tested-by: Mostafa Saleh 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 06d28621722e..0a84140afa28 100644 --- a/arch/arm64/kvm/hyp/nvhe/sys_regs.c +++ b/arch/arm64/kvm/hyp/nvhe/sys_regs.c @@ -392,6 +392,14 @@ 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), -- 2.53.0.1018.g2bb0e51243-goog