From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 304852DF155 for ; Fri, 27 Mar 2026 14:01:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774620071; cv=none; b=SCPzn7dLvq0dL6t4ByD1AQHbO3Bg1GSWTJipbzL0epM5au6Rm+LE0yk+crZ+J++e5BgNnavTxQwSJwfkvMMA3OTx82fzqFNPUiZeEDpNQRFGumXVDN6tOUH7fBNaD7x9l31PMSo7igqYMZqjsgvFjOnGLm34Ewe0cikyiS/ejk0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774620071; c=relaxed/simple; bh=ow7XJsMmy3N9br36ooPJfkzHGKyMX+Ym+pCiAfKaBdg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NpJ0ccP5ElqM/eVm70nibhAaeijbcuSpHDxWmoF+lo4QXn3a+3yWUSB65tGa7Nr0g/welJRCkwVhiJiFTPZH8/1ITC08N5oOxiSFo65uzoF5jMIh+JC4AniowQjgVYeyC5r58NKbtnpF5m1w/QvXPXf4tnuogIsuG4rpmZ1WTwQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fpdPJ9rE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fpdPJ9rE" 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> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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