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 EC9E529A0 for ; Mon, 14 Oct 2024 17:17:05 +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=1728926226; cv=none; b=Cd8XYrVwHUZEgUP0BpaM2UY1WC5lVJQDhNrmj0Gl9bSdxIKFqGp5Jp8VdMk4CSb3B5+4pNiw/lQl0VBgO9EYecU3e3pg/X+p8tdxlsqABrbdemR93O7m+dW1a6BdBXnBYj6kcA/zK/Xglw5jvBtNx8HAE+Prj7HWsEiAEOtd4X8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728926226; c=relaxed/simple; bh=tkZMzrqCa7d7qPIHP+rVs3i1sSt4NE0tKsGuYhfbrvo=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=Jae2Wa7VeoVJBF/hCoO+SP86pw3Ji2W6oLycvQ/j0OGkU7vvdTcbpKu7oKOuyyJH/kkbE2AcX7YjxD7vKa1gUK/i7Mm6C0W2vMTV7/LTRyVQzcAtquXhyfGQP0zXWmIswEEsI1w+nhMJ41dkYA6KVTHZmEK00RYI9GFrr668Aho= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DbVav+KN; 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="DbVav+KN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D308C4CECE; Mon, 14 Oct 2024 17:17:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728926225; bh=tkZMzrqCa7d7qPIHP+rVs3i1sSt4NE0tKsGuYhfbrvo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=DbVav+KNhHCpLex6SCOtR9ao0YSW2EY9EI7rRUjNsblgNv/zkuXtoGiTZAXl/5g06 qcSV4x4D9TsD7g96grDxSZtSGaUF1TTfv0ECk+akP5hZ1vIRBxBwEJDt1j6Uihrt1i sGVJbByz8hbGl89QqZ0hQnU+ia1cPsC1kC9bWO0za77qdssy4KxO24wnmwOsdwyBbC hVYPsLxQEgsL8FMY7TIOMeoo5V/4PFKqlhr4i3aseFwHYyi8Fdcdzf2TjQhpj2YlMF TugzCsT4VW2a5GK5zgULGSTMpTc9T9C/XBw5o4CoW3TY8/q3TsmA68AEoC8oycs4i5 kGvEG77LZ2j2w== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1t0Ogp-003T8M-Aq; Mon, 14 Oct 2024 18:17:03 +0100 Date: Mon, 14 Oct 2024 18:17:03 +0100 Message-ID: <865xpu61v4.wl-maz@kernel.org> From: Marc Zyngier To: Fuad Tabba Cc: kvmarm@lists.linux.dev, oliver.upton@linux.dev, catalin.marinas@arm.com, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, will@kernel.org, christoffer.dall@arm.com Subject: Re: [PATCH v1 0/4] KVM: arm64: Update KVM_VCPU_MAX_FEATURES and refactor to avoid same issue In-Reply-To: <20241014165809.984883-1-tabba@google.com> References: <20241014165809.984883-1-tabba@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.4 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: tabba@google.com, kvmarm@lists.linux.dev, oliver.upton@linux.dev, catalin.marinas@arm.com, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, will@kernel.org, christoffer.dall@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Mon, 14 Oct 2024 17:58:05 +0100, Fuad Tabba wrote: > > The value of KVM_VCPU_MAX_FEATURES has not been updated since > adding new features in commit 89b0e7de3451 ("KVM: arm64: nv: > Introduce nested virtualization VCPU feature"). Could you please expand on what is broken? 89b0e7de3451 makes a point in *not* exposing this to userspace, as outlined in the commit message -- this is done on purpose, because NV is not functional yet. Thanks, M. -- Without deviation from the norm, progress is not possible.