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 A84A129D29A; Mon, 13 Oct 2025 16:56:19 +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=1760374579; cv=none; b=R+O0JUP2wMx5/slbJanbXS+bZiEeZr4cjO8yLdIKB7+wod/eOgUsUV2awtDSCCWdVV6hwXi4vahpeLTw2+UbiJoVDWVj3nBmvOavwe+NBbVKAYdvuSGALzU3wbiPePIgSTugQQ0yBTrqFQ/Lq44l6pOGgNBooZvZDEfDW4ABkO4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760374579; c=relaxed/simple; bh=oCjPIm76LeAR7DfSG4KlC7i2J3UvMls2jcJsn1nEWxs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=m2LQXWxd/pPUnM+vfp0JxseFRB2GFfUbvd1Npj3vOWHnrNz8cEdhLlEUN71MyAV57/CtFdbL42EJ4NA0KlIm4BgM0vJeSpGIjCEENtdHm41U0NfkD8zFVMCnCt5HFhv1FskUEB2ECfvcGY87vNVp7xV96efrI/nejJKy7Ek6iB4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qpb05tO7; 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="qpb05tO7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86924C4CEE7; Mon, 13 Oct 2025 16:56:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760374579; bh=oCjPIm76LeAR7DfSG4KlC7i2J3UvMls2jcJsn1nEWxs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qpb05tO772ZPfXZUyLLCko/z4F0vClyyZnetI+E2KnCLb9bL9xJFFyFJ7CXh0xgYl AbTeicJzvYTLc+eu6pBpQfMuP2aPiFmJiyfvBnPqFhLBjIYSfiDa63BiBll+fPH5HV OEbAvXtO/KfudobNdFhcfw5WJtjL10KOLOr4fgHlRfrIAeIK7EdMWkXqpZFLAM8mn5 rvANRZEP+ytVvcMndjX4fORUEqy+yKyVMJca6Bvs8JrD2PjqK6yXsT/gN2ivg2k5WH dT9P/BpZFv+GY1mXb/rq8Op0ondmigG61hHUVVTKZlLB1XyS8MoSKb/Lb3pwLU4sSP biMkJR/8PWeHw== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1v8LqL-0000000DaVX-2zDr; Mon, 13 Oct 2025 16:56:17 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Sascha Bischoff Cc: nd , oliver.upton@linux.dev, Joey Gouly , Suzuki Poulose , yuzenghui@huawei.com Subject: Re: [PATCH] KVM: arm64: gic-v3: Only set ICH_HCR traps for v2-on-v3 or v3 guests Date: Mon, 13 Oct 2025 17:56:15 +0100 Message-ID: <176037441180.969330.798856280799815530.b4-ty@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251007160704.1673584-1-sascha.bischoff@arm.com> References: <20251007160704.1673584-1-sascha.bischoff@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Sascha.Bischoff@arm.com, nd@arm.com, oliver.upton@linux.dev, Joey.Gouly@arm.com, Suzuki.Poulose@arm.com, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Tue, 07 Oct 2025 16:07:13 +0000, Sascha Bischoff wrote: > The ICH_HCR_EL2 traps are used when running on GICv3 hardware, or when > running a GICv3-based guest using FEAT_GCIE_LEGACY on GICv5 > hardware. When running a GICv2 guest on GICv3 hardware the traps are > used to ensure that the guest never sees any part of GICv3 (only GICv2 > is visible to the guest), and when running a GICv3 guest they are used > to trap in specific scenarios. They are not applicable for a > GICv2-native guest, and won't be applicable for a(n upcoming) GICv5 > guest. > > [...] Applied to fixes, thanks! [1/1] KVM: arm64: gic-v3: Only set ICH_HCR traps for v2-on-v3 or v3 guests commit: 3193287ddffbce29fd1a79d812f543c0fe4861d1 Cheers, M. -- Without deviation from the norm, progress is not possible.