From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 0822FCEE334 for ; Tue, 18 Nov 2025 16:13:10 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vLOI0-00030j-GZ; Tue, 18 Nov 2025 11:10:44 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vLOHa-0002l9-4a for qemu-devel@nongnu.org; Tue, 18 Nov 2025 11:10:21 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vLOHX-0005Gx-D8 for qemu-devel@nongnu.org; Tue, 18 Nov 2025 11:10:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1763482214; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oe9X9vrtzuAvfuKIbXQg7zoSn4VcD4HMrEpnSfOuFKg=; b=aaUDFUSkPaVAhVJa0DfZ3Q7rdRyNgqpAWQT5/UpoFnHp+hkqWfWRtxjpa0jsTkc71J1S1q F4nNjJjqxU7FsPLWlcsUZtIETe3gMecfJ9JCzDZ49cOx/A7cgihq6FyggbbYhblTwG6uVL mtz+/HDtU2t0BJOeoxxGYOZ08sn7Ux8= Received: from mx-prod-mc-01.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-252-E3JPMRIzOsevxW9EbuKpBA-1; Tue, 18 Nov 2025 11:10:09 -0500 X-MC-Unique: E3JPMRIzOsevxW9EbuKpBA-1 X-Mimecast-MFC-AGG-ID: E3JPMRIzOsevxW9EbuKpBA_1763482208 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (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-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5986C195607F; Tue, 18 Nov 2025 16:10:08 +0000 (UTC) Received: from laptop.redhat.com (unknown [10.44.32.16]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id BF4B519560B2; Tue, 18 Nov 2025 16:10:03 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, cohuck@redhat.com, maz@kernel.org, oliver.upton@linux.dev, sebott@redhat.com, gshan@redhat.com, ddutile@redhat.com, peterx@redhat.com, philmd@linaro.org, pbonzini@redhat.com Subject: [PATCH v2 7/8] target/arm/cpu: Expose x-mig-hidden-regs and x-mig-safe-missing-regs properties Date: Tue, 18 Nov 2025 17:07:37 +0100 Message-ID: <20251118160920.554809-8-eric.auger@redhat.com> In-Reply-To: <20251118160920.554809-1-eric.auger@redhat.com> References: <20251118160920.554809-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Allows to set both array properties along with arm cpus. Their "x-" prefix reminds that those shall be used carefully for distro specific use cases to garantee cross kernel migration. This will allow to define such compat machine props like: static GlobalProperty arm_virt_kernel_compat_10_1[] = { /* KVM_REG_ARM_VENDOR_HYP_BMAP_2 */ { TYPE_ARM_CPU, "x-mig-hidden-regs", "0x6030000000160003" }, { TYPE_ARM_CPU, "x-mig-safe-missing-regs", /* TCR_EL1, PIRE0_EL1, PIR_EL1 */ "0x603000000013c103, 0x603000000013c512, 0x603000000013c513" }, } The first one means KVM_REG_ARM_VENDOR_HYP_BMAP_2 shall always been hidden for machine types older than 10.1. The second one means that along with 10.1 machine type we may receive in the incoming migration stream, 3 registers that are unknown on destination. Obvioulsy, using the reg index as defined in linux/Documentation/virt/kvm/api.rst is not user friendly. However those options, prefixed with "x-" are supposed to be used rarely by people who know the details. Signed-off-by: Eric Auger --- target/arm/cpu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 066746d76f..c41774cb4c 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -2248,6 +2248,11 @@ static const Property arm_cpu_properties[] = { DEFINE_PROP_BOOL("backcompat-cntfrq", ARMCPU, backcompat_cntfrq, false), DEFINE_PROP_BOOL("backcompat-pauth-default-use-qarma5", ARMCPU, backcompat_pauth_default_use_qarma5, false), + DEFINE_PROP_ARRAY("x-mig-hidden-regs", ARMCPU, + nr_hidden_regs, hidden_regs, qdev_prop_uint64, uint64_t), + DEFINE_PROP_ARRAY("x-mig-safe-missing-regs", ARMCPU, + nr_mig_safe_missing_regs, mig_safe_missing_regs, + qdev_prop_uint64, uint64_t), }; static const gchar *arm_gdb_arch_name(CPUState *cs) -- 2.51.1