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 05F6D221543 for ; Mon, 19 Jan 2026 12:47:11 +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=1768826832; cv=none; b=UOlL27Hch0o2y41zFQyz00sR1kT/4AtKfLSCX1i30fQyp9Vhp7mbeOXBeZN37r1Nb/d0ilOV+OPHV0pbm8c6/G624FATVjmRlIgMLqd1lJkNFVJljOwPIOb/YQHxs/S61fXwbaK6mVZ9DiskBKaDZMUq5/fH7Ae1zQ37mMng5fM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768826832; c=relaxed/simple; bh=Ci8Yc7ndwDlszED/Qx1HGsS3eO9VUT9SMiftdYGNQu0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cThhWQH9YeSiE+QGuDwpFnSW4KaZJScfw6nBAXTOPIH7lWpYPc4micnZFDnakdlft45cMqvSj+t6OzDWSqauYaqlFTp+jmnmM0aJsJ5oYFitOzCrxfMpXaEKstyGEqN1HlQDekkrsK8i4zW30pVH3FS3/fF9i27ghhBYRFJF0xQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L+kax+mF; 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="L+kax+mF" 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> 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), -- 2.52.0.457.g6b5491de43-goog