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 981142FFDF7 for ; Mon, 5 Jan 2026 15:50:06 +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=1767628206; cv=none; b=uTmNGznQTZju7Onr1BrEtlBBsBqpKw0IrhWRF0slATIWv5sxhV7PFbBhzxLaXWq5pdvqs4My0AmEdRGdA7TbpPWdkW4EfUO6fBYPdm31yF3TeqH79amkGw1WaAuznIOdLUpUNZA4ePKoZrNkIoIEi4m53VIh/l+eLhiGzfGag2c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767628206; c=relaxed/simple; bh=slfr55E2le7kv/1YuB/BPrtDozKTarzMBTzRIRUEr8I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gq/p6hRvhuA5VvPT5gZ4JWj4kMviHlhjQd5udwI3dnPgub2jRQwM5k0/IKl8KZ2U6HWYP3lgnY524yZ9DKyIMynSCUb/HPSQ6IZ1e8ESxq7IaS6Ng98RTd8taitVxM+F34jxtNDbrMpOyqoYq0NHVxH0nV9mUUI4hp1Ph5qB6C0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PNe2ibjz; 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="PNe2ibjz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F5A5C19421; Mon, 5 Jan 2026 15:50:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767628205; bh=slfr55E2le7kv/1YuB/BPrtDozKTarzMBTzRIRUEr8I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PNe2ibjzuSwchxppJkcNekOmPZiyvcX2vgZVhiTNwmI+HRhxbVPeU6mvM00A4hBgS zibDsgfG0sZ49CPxi2HBT5oPZmpoOWmRlXaNc0iL4qBiwOQVV++Plz6AUagm7+WBlz 7Yw8Wfdvyk3yt0LSUWAG3Tw4vNKvWiN2Q7pHCp5o0bFugNkLqTyNPebQKWD4KcLkln /9E4Sq5JF91eQEGBr5QfOe47HPcG5sN1Fr1sCWH9mfjUCt1egaGfORAR9eOAr5U/Vo RmvZSsjH4DfwAF5Yg06wPKDrrQI3jAVI/A7uf2KQSb22ZFkXbesBoTJ512EIEe2lGs VZB4jf/bBAFrA== 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 05/30] KVM: arm64: Expose self-hosted debug regs as RAZ/WI for protected guests Date: Mon, 5 Jan 2026 15:49:13 +0000 Message-ID: <20260105154939.11041-6-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260105154939.11041-1-will@kernel.org> References: <20260105154939.11041-1-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. 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), -- 2.52.0.351.gbe84eed79e-goog