From patchwork Tue Jun 18 06:38:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shaoqin Huang X-Patchwork-Id: 13701827 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3F128C27C4F for ; Tue, 18 Jun 2024 06:38:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=IfLvXm2V5JOTZZDkXFJiskwnoCllrw9pJu6yeA9YaNw=; b=YCTUKM+H9KlBArTSR7qXMAYLIH XTBTS5RajberG6N3jpAoypJnI+1GuzgYUe+8pDro15fD+l8MQIdfSmIl3ZoOPigBZ3lYZDGCoBUu2 SUAs5dIUhaM8BfyBgFcnWR392cg0t4YPjYna2w48/WtnAL3zRJTGdd1IhgQKL+xV3b35g1vqHEhPv IAoeUC6DVLgRVHqQ9DxT73x4xDDB7TsuaWx9v9TtLXlAmWpouP5kqr8kkvKyl3KKY3kt5bzrfxRgE 5P/+1G1iHZ9rJ8HOfexcKxGIXSmRVJvK3mGCUwtS4QnLh6jVBrylJdO/HgnkxKmeAfQnk0DG0EaOB VJXyLunQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJSUG-0000000Dpir-0kv9; Tue, 18 Jun 2024 06:38:36 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJSU4-0000000DpcD-2Ll0 for linux-arm-kernel@lists.infradead.org; Tue, 18 Jun 2024 06:38:25 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1718692703; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=IfLvXm2V5JOTZZDkXFJiskwnoCllrw9pJu6yeA9YaNw=; b=QMjZa6WkaiQT5W1gOaC2saFRNkteG1hbBZym+RVy6gOYYO93HVq0gSD9lt+BAGL/SGc6EH q2CnM4gi0ZNwjYLV91eGizUkuuq7hcf8b8utNc35IJI4um5/FD4N2uo3/ClhIXH+dh55Bo bplj3M4xHJrb5JXSt5VJuoS7U7CkoAg= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-449-Yf6jUZeuPLCpVYUnFZO6Tg-1; Tue, 18 Jun 2024 02:38:18 -0400 X-MC-Unique: Yf6jUZeuPLCpVYUnFZO6Tg-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 3F50019560B9; Tue, 18 Jun 2024 06:38:14 +0000 (UTC) Received: from virt-mtcollins-01.lab.eng.rdu2.redhat.com (virt-mtcollins-01.lab.eng.rdu2.redhat.com [10.8.1.196]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 0C9F41956052; Tue, 18 Jun 2024 06:38:10 +0000 (UTC) From: Shaoqin Huang To: Oliver Upton , Marc Zyngier , kvmarm@lists.linux.dev Cc: Shaoqin Huang , Catalin Marinas , James Morse , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Paolo Bonzini , Shuah Khan , Suzuki K Poulose , Will Deacon , Zenghui Yu Subject: [PATCH v2 0/2] Allow userspace to change ID_AA64PFR1_EL1 Date: Tue, 18 Jun 2024 02:38:05 -0400 Message-Id: <20240618063808.1040085-1-shahuang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240617_233824_708378_BD381552 X-CRM114-Status: GOOD ( 10.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Allow userspace to change the guest-visible value of the register with some severe limitation: - No changes to features not virtualized by KVM (MPAM_frac, RAS_frac) Also add the selftest for it. Changelog: ---------- v1 -> v2: * Tackling the full register instead of single field. * Changing the patch title and commit message. RFCv1 -> v1: * Fix the compilation error. * Delete the machine specific information and make the description more generable. RFCv1: https://lore.kernel.org/all/20240612023553.127813-1-shahuang@redhat.com/ v1: https://lore.kernel.org/all/20240617075131.1006173-1-shahuang@redhat.com/ Shaoqin Huang (2): KVM: arm64: Allow userspace to change ID_AA64PFR1_EL1 KVM: selftests: aarch64: Add writable test for ID_AA64PFR1_EL1 arch/arm64/kvm/sys_regs.c | 3 ++- tools/testing/selftests/kvm/aarch64/set_id_regs.c | 9 +++++++++ 2 files changed, 11 insertions(+), 1 deletion(-)