From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 A7E7220C461 for ; Thu, 1 May 2025 03:50:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746071447; cv=none; b=c2l06qro264/eXUeJYAWwqGVh9nsbdiz7ThA6jWnYdipBFbQ03gwx/mZq4Gs3hc8+Uz+YrgFX1k131mi1yROx757mNPgsA1r30N/ON64AwAg8o/VTkJGCSn73h4aUHGbd/jKHwg0ypgFnCCrDBZeUW/r4ZQfOYQ4ddVuJWQpkm4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746071447; c=relaxed/simple; bh=2dAVFnoSWIkTOqjHfYENLB8pzU1NdvuV0xq8Gvel9G0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Gejz3FMwUc2p2UZR71bpqU/CBKKqaT6zjLpC7ulf516MN132iNFaMWxhZSNUHsagWYs/unM7K5c/L+QlmYDdoIkuk2UHL9uQBanug0/MJFRuyidb+kJBBaeFgY1HYc8+Y5pXZl3NN5LpfCiFVTxIfggX5mGRciytZag/KR7ndls= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=IQWibwIc; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="IQWibwIc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1746071444; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xu+Kf0+DFCNXRO2ndZGA8xUx9TD/werA57XUeiFDww0=; b=IQWibwIcdfF/tz6XEWtD69Y1E/jrvkb0eq6SmtQgm9vHB40Dx3kTY6bgi/7VmTXnLwLtdX O5EnP7FCTnfsFxF38MrkTFgB0XNUmimQMjEia4geXwnjptjzG9yGqQ6ns15Jej8fjhOHhY Lagw9xCQvOAg30I/L/5WGh3xgWRkNFU= Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-588-sWKdeu_uNCeex5-yQdzDmA-1; Wed, 30 Apr 2025 23:50:41 -0400 X-MC-Unique: sWKdeu_uNCeex5-yQdzDmA-1 X-Mimecast-MFC-AGG-ID: sWKdeu_uNCeex5-yQdzDmA_1746071441 Received: by mail-pf1-f198.google.com with SMTP id d2e1a72fcca58-736c1ea954fso360569b3a.3 for ; Wed, 30 Apr 2025 20:50:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746071441; x=1746676241; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=xu+Kf0+DFCNXRO2ndZGA8xUx9TD/werA57XUeiFDww0=; b=voupL4Iq9cy5IWCiQi8xwTsMJUBJ9GT5g7z6qsbiEXT+n9e/QCTnpB6Jl6SMq6i8k5 HfTW1lNSIszUrTSPS9LgaUGUltI4X+wsD9Yx6xgsV2SrdBfRar9GNH/QsupBEqAVV11W feGRWhK8LMItlOUqbK4UgzKkJTHF8+gwA0y+LxD2Kk/3ZHh9p01DRXhAqFt0vq2Z9ceW Mh/2pNf4NBjIsAsxO9rd8Ka/LYLcaPwFAN6d1aU6OVHpxylNm50qbKwphWHSe5KyLPmr oSjgQt7Yo9G+Et9Dr7uhFPfMLIPXL/DTMQmrT7ngQV3bQpixf9xx2vucC1VPntCg79tZ otjQ== X-Forwarded-Encrypted: i=1; AJvYcCXYHrwgQNqfjXmYfW21tUbFUaLM9s6zyobzQfN1ajnNYjZ80COoooF9viFC482jcOnhnB1k7hr8Jo9qzD4=@vger.kernel.org X-Gm-Message-State: AOJu0YxG96sj5AznoMvSPOmqkVaJb4/KAfFG6P3x3P4d+DBoL6ZOQCyZ q8Zb+0WC26HwtYJ977QBcfm2yvpnOfRxFd9CsZEbhkadJkQEELL1rnTiCFVC6YyfmOQqfiVWr7o UilSicsgoo+SBxF1tTWRkhOTu+xBk76c48RIODGZq06LFRy1Q4XocgRckRYJHFQ== X-Gm-Gg: ASbGnctaWWO6WWk/Z4fWpUrlBAs4W2bJZbSy1mUi+YzIKUViWIvvWO5wVvtZQ3lYue2 jFseG+KP4XS/Q/EViWUI/kwV9KS/uoGHNcXIiZv3fj3Fui0955YaWIjhOrjgMN4+leGDpVYxDCk mIGKJVOwywQMc/XWD5Jah/2+w7ixPlRTw+gYg5vcluaFqTekNi6x2aGf2ku2LfEQoKZdCWpyLf6 UWkL55XN1QAOVDarvkQxq5yyLRQIlueFRumy3HcIbw7QmEPXjJzwvcMVti+ku9GN6dMe24VlrVY vxtqx/zZ9KM2 X-Received: by 2002:a05:6a00:2da3:b0:736:a82a:58ad with SMTP id d2e1a72fcca58-7404923a33dmr1298195b3a.15.1746071440946; Wed, 30 Apr 2025 20:50:40 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF+2TUVWiAQRNStfJKlXXyrEy8i+Rkh7KlouLhbtQWVsBfOICdI6sUfx8nwE+QueIaBYA6F7Q== X-Received: by 2002:a05:6a00:2da3:b0:736:a82a:58ad with SMTP id d2e1a72fcca58-7404923a33dmr1298168b3a.15.1746071440658; Wed, 30 Apr 2025 20:50:40 -0700 (PDT) Received: from [192.168.68.51] ([180.233.125.65]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74039a2e5ccsm2541439b3a.110.2025.04.30.20.50.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Apr 2025 20:50:40 -0700 (PDT) Message-ID: <87f40de1-dd3b-43e2-aa67-8d7b6288acf8@redhat.com> Date: Thu, 1 May 2025 13:50:31 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 38/43] arm64: RME: Configure max SVE vector length for a Realm To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Jean-Philippe Brucker , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" References: <20250416134208.383984-1-steven.price@arm.com> <20250416134208.383984-39-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250416134208.383984-39-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/16/25 11:42 PM, Steven Price wrote: > From: Jean-Philippe Brucker > > Obtain the max vector length configured by userspace on the vCPUs, and > write it into the Realm parameters. By default the vCPU is configured > with the max vector length reported by RMM, and userspace can reduce it > with a write to KVM_REG_ARM64_SVE_VLS. > > Signed-off-by: Jean-Philippe Brucker > Signed-off-by: Steven Price > --- > Changes since v6: > * Rename max_vl/realm_max_vl to vl/last_vl - there is nothing "maximum" > about them, we're just checking that all realms have the same vector > length > --- > arch/arm64/kvm/guest.c | 3 ++- > arch/arm64/kvm/rme.c | 42 ++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 44 insertions(+), 1 deletion(-) > Reviewed-by: Gavin Shan