From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (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 9D7E9158DD0 for ; Tue, 27 Aug 2024 08:58:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724749132; cv=none; b=FMMzywtVUIwCgs/woRXsflV8LYOGhwqRGUvFHRSo5P26uwquTVhxvVHYezdpAJ1bbQWefKEdAJfWn5h8b6SpMCbPoImkyxpDGnpYjRr+0wGmgNeNbF2LLM4ihDrVN878Y1j5oNfA5CdFJHiaL14uV9+MBEsyan3zLwRUnvqKuJE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724749132; c=relaxed/simple; bh=oNdOviKyuIrr5vkcgKfovQ1IBbsfJ1aSy7l73C8Cxj4=; h=From:To:CC:Subject:Date:Message-ID:References:In-Reply-To: Content-Type:MIME-Version; b=pwa+ps+JXRF8LKnU0PS12+hMiVFzDq5zM31Ioivkx+vHcAQ1CjU1tSCbVAZBJORSHlQDLrl9xkcMS7wpFKGVQxllp7d4112ZXzhwDPm7b0VKwj+jR1BHn39OGADLZZXCjfy7epjyTRK2N+35zimI09rUrr99Gv/rIU9xJRFFnuY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.105]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4WtLzs4k2BzyRDN; Tue, 27 Aug 2024 16:58:17 +0800 (CST) Received: from kwepemm000007.china.huawei.com (unknown [7.193.23.189]) by mail.maildlp.com (Postfix) with ESMTPS id C6032140137; Tue, 27 Aug 2024 16:58:46 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (7.191.163.240) by kwepemm000007.china.huawei.com (7.193.23.189) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Tue, 27 Aug 2024 16:58:45 +0800 Received: from lhrpeml500005.china.huawei.com ([7.191.163.240]) by lhrpeml500005.china.huawei.com ([7.191.163.240]) with mapi id 15.01.2507.039; Tue, 27 Aug 2024 09:58:43 +0100 From: Shameerali Kolothum Thodi To: James Morse , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.linux.dev" CC: Marc Zyngier , Oliver Upton , Suzuki K Poulose , yuzenghui , Catalin Marinas , Will Deacon , Jing Zhang , "Wangzhou (B)" Subject: RE: [PATCH v3 4/6] KVM: arm64: Disable MPAM visibility by default and ignore VMM writes Thread-Topic: [PATCH v3 4/6] KVM: arm64: Disable MPAM visibility by default and ignore VMM writes Thread-Index: AQHae7EcWBfUhFLWfESLuHqxbBJIrbHdahYAgF5ahfA= Date: Tue, 27 Aug 2024 08:58:43 +0000 Message-ID: <82695efb73ca463b904aa49a595be06c@huawei.com> References: <20240321165728.31907-1-james.morse@arm.com> <20240321165728.31907-5-james.morse@arm.com> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hi James, > -----Original Message----- > From: Shameerali Kolothum Thodi > Sent: Friday, June 28, 2024 9:11 AM > To: 'James Morse' ; linux-arm- > kernel@lists.infradead.org; kvmarm@lists.linux.dev > Cc: Marc Zyngier ; Oliver Upton ; > Suzuki K Poulose ; yuzenghui > ; Catalin Marinas ; > Will Deacon ; Jing Zhang ; > Wangzhou (B) > Subject: RE: [PATCH v3 4/6] KVM: arm64: Disable MPAM visibility by defaul= t > and ignore VMM writes (vcpu, rd, user_val); > > +} >=20 > Commit 14e270fa5c4c(arm64/cpufeature: Add remaining feature bits in > ID_AA64PFR1 register") > exposes the MPAMFRAC filed in in AA64PFR1_EL1. Don't we need a similar > handling for that > as well to handle the FEAT_MPAMv0p1 case? >=20 > Also any chance you plan to respin this series soon? We do have hardware > that benefits from this > series. Just a gentle ping to see if you have plans to respin this series soon or n= ot.=20 Please let me know, if I can be of any help. We do have platforms that differ in their MPAM features and that breaks migration.=20 Thanks, Shameer