From patchwork Wed Jun 12 02:35:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shaoqin Huang X-Patchwork-Id: 13694375 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 5E021B651 for ; Wed, 12 Jun 2024 02:36:12 +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=1718159773; cv=none; b=EbXgjeV6CUJrPmc+jF0jt0kM4JHemtFHYOf3FKZCyPZiXHf72HKGaKQKo9Gi18F6cUh96MzD+D0uUthk5f0bI5v4HBUtbWR1kM3dedtn9BxiqcXCyCsuqH0RjdZxrBoYM/mIn1HER7RnrBYUwUyMIJcp5MQWVZTrYaGgdk2WBwU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718159773; c=relaxed/simple; bh=+zTXVVp9zEYSS8FpmkYG3jt7vMygW3q5VbDW7BOSSik=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=IIeB8diJsf+B4fy7gg/srScPQodCcS9+XgcJSqzSGUw7H7aCNJgGvsh+3QWd02wGltOubHH0YF9UjEvd01TEFuXRAEvHbNuzdD3iGaYy9cEOVBbw0EpA+f0futhZHLAhnMUsWgO2D8q57TaXX6LH7rgsME21TUoccDzy0hWMHU0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none 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=JY4/gZ7u; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none 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="JY4/gZ7u" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1718159771; 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=rm5KrzlMz16jgYDKm0W+81rd6UxTby42kLMaocYRJT4=; b=JY4/gZ7ud1se1mOvSiFVsqrmTI0ucmOkayGzy2C093HVTcVG9WXCwvtdS7/fv7nh3XAjwj MYGbw3qtJFBTcdYK7X0EbkpGU7zYzAHu1cb91qTrPkmQreHLTGTqLTDMkjtE6i2UgiMz/T kVFXMXTmyeMTLCWY7PN2vTMcTm4hOP4= Received: from mx-prod-mc-04.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-582-I3EBlmaWOheMu2EXI5MiEQ-1; Tue, 11 Jun 2024 22:36:06 -0400 X-MC-Unique: I3EBlmaWOheMu2EXI5MiEQ-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (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-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E358019560BD; Wed, 12 Jun 2024 02:36:02 +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-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 1E53B19560AD; Wed, 12 Jun 2024 02:35:58 +0000 (UTC) From: Shaoqin Huang To: Oliver Upton , Marc Zyngier , kvmarm@lists.linux.dev Cc: Eric Auger , Sebastian Ott , Cornelia Huck , 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: [RFC PATCH v1 0/2] KVM: arm64: Making BT Field in ID_AA64PFR1_EL1 writable Date: Tue, 11 Jun 2024 22:35:50 -0400 Message-Id: <20240612023553.127813-1-shahuang@redhat.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Hi guys, I'm trying to enable migration from MtCollins(Ampere Altra, ARMv8.2+) to AmpereOne(AmpereOne, ARMv8.6+), the migration always fails when migration from MtCollins to AmpereOne due to some register fields differing between the two machines. In this patch series, we try to make more register fields writable like ID_AA64PFR1_EL1.BT. This is first step towards making the migration possible. Some other hurdles need to be overcome. This is not sufficient to make the migration successful from MtCollins to AmpereOne. Shaoqin Huang (2): KVM: arm64: Allow BT field in ID_AA64PFR1_EL1 writable KVM: selftests: aarch64: Add writable test for ID_AA64PFR1_EL1 arch/arm64/kvm/sys_regs.c | 2 +- tools/testing/selftests/kvm/aarch64/set_id_regs.c | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-)