From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793050212; b=T3+yT/HUrvTgQCpRUyyBorIrVYsqMoPaysKDOTidcvzXhC89SQ1u/a9VuvSVqH3SlrYb aVwILBevw1FU6Mr5bVWatPhw/sg2Kz4YP0g0x8fdMQAIOGmm0X0GwimYBvx92oFh7/VQJ hImLT8XI26PGi9DWjA0t1uz+yv76yTdghOLw9EkSplVxSc/+BxLkETqPfHc8y1AlWU6qK 0Z8PAWdLPcBPp1G6NNACr3GE1w2Uwi9gQKSgHlkap2qz/SyawKolngAJedh3++YfWGEiX gXlf4WP5QQGFeQsyK10uORMsxmWC3I8LkAQQcKtrh4ojIqRw83ERSo8vsDPDSHuaerw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793050212; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=wnInlAoM7eCnwc4pQzCJ3JjKUOaq29EJiA2dB7FE3lc=; b=w61mVtqcOpY4sInENPCXYeU/gvzoA5YSIAHuuCl9y/75VcOdH9JEQVNSm5JNb1hEqZL+ xuTPHqj0gfCDMOLks0uELMo+EzT0ZwKdb9TJrwCzF3o3uNddvrFji+PaomU16UkCb/DeT gbozVLG2gSBOvJIiUyp75Zz7oIXLzxMfXT/4lk2srYVSyUBFDaa3dqFf5wC8RqEpLx4DK IFXq7JIhX7cLQzOPywtKQJPXqJj6J6CbQHQtxay3CHnF5a6ZmP/T6IaFCuAt1ULb94ASq fAmxJRCQelGu8ih1gFcVeYGJpnjAbPpElNAU/z9FywpOFv6HX6gYBbMMlwWgJ2Glu+w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="Tv6/cPLh"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 07757606A31D; Mon, 26 Oct 2026 21:30:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Tv6/cPLh Received: by smtp.kernel.org (Postfix) with ESMTPSA id 58B081F01829; Mon, 26 Oct 2026 21:30:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793050211; bh=wnInlAoM7eCnwc4pQzCJ3JjKUOaq29EJiA2dB7FE3lc=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Tv6/cPLh4sVaKXCK89oJRyF7wE8NcPivUztYh15k6VmzCpjEp2C5Fzg2+rfb/Hcbb xTJWKm66k1H4p5qcWHcV9aF+DPo0UJNegdI439bi3n3PeXtlKUIV87EkAQLZeqgH1P GWCDtb+BEg0x/d5SU7bB+uAPMyh+wxK2/20v/alpOXo+GNNUoDpr614XE8MzjldNO3 Y1Rdm/bJqjDAymCb1ai5mV+DldMj6FiZjQJdaK7lnZ/3xkIFmAiT4ClF7cdzgqPXd5 11mx2fsBPP+ZhjtQlBuAQ9i4uj4GTRCmcmnLelhhdsorLoH0P7DAW/zk4bdgvjGXXP I3ENK1ifhMJXQ== Date: Mon, 26 Oct 2026 14:30:09 -0700 From: Oliver Upton To: Marc Zyngier Cc: Fuad Tabba , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Raghavendra Rao Ananta , Eric Auger , Will Deacon , Fuad Tabba , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] KVM: arm64: vgic-v4: Don't allocate vPEs for a GICv2 VM Message-ID: References: <20261026152639.3926498-1-fuad.tabba@linux.dev> <20261026152639.3926498-2-fuad.tabba@linux.dev> <87qzhc8ce6.wl-maz@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87qzhc8ce6.wl-maz@kernel.org> On Mon, Oct 26, 2026 at 07:55:45PM +0000, Marc Zyngier wrote: > On Mon, 26 Oct 2026 19:12:23 +0000, > Oliver Upton wrote: > > > > On Mon, Oct 26, 2026 at 03:26:38PM +0000, Fuad Tabba wrote: > > > KVM can run a GICv2 VM on a GICv4.0 host whose CPU interface supports > > > legacy operation. > > > > I'm pretty sure there's no IP out there that has GICv4.0 and legacy > > mode... > > My favourite space heater, HiSi D05, says otherwise: 64 A72, > GICv4.0. Remember that it is the *CPU* that provides compat mode, and > not the GIC. Well I forgot that one got glued together. Good thing you're on the hook for fixes this round then ;) Thanks, Olier