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GET /api/1.0/patches/2197502/?format=api
{ "id": 2197502, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2197502/?format=api", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.0/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260218015151.4052-7-graf@amazon.com>", "date": "2026-02-18T01:51:46", "name": "[06/10] target/arm/cpu64: Allow -host for nitro", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4f84a4520ca0e4b6b9525b4728d97b4ccfce1ef3", "submitter": { "id": 76572, "url": "http://patchwork.ozlabs.org/api/1.0/people/76572/?format=api", "name": "Alexander Graf", "email": "graf@amazon.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260218015151.4052-7-graf@amazon.com/mbox/", "series": [ { "id": 492503, "url": "http://patchwork.ozlabs.org/api/1.0/series/492503/?format=api", "date": "2026-02-18T01:51:40", "name": "Native Nitro Enclaves support", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492503/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2197502/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=amazon.com header.i=@amazon.com header.a=rsa-sha256\n header.s=amazoncorp2 header.b=UXRY5C0G;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fG00R4tGZz1xwC\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 18 Feb 2026 12:53:27 +1100 (AEDT)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1vsWkS-0007wN-Q0; Tue, 17 Feb 2026 20:53:04 -0500", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <prvs=502105d20=graf@amazon.de>)\n id 1vsWkR-0007m1-BT; Tue, 17 Feb 2026 20:53:03 -0500", "from pdx-out-011.esa.us-west-2.outbound.mail-perimeter.amazon.com\n ([52.35.192.45])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <prvs=502105d20=graf@amazon.de>)\n id 1vsWkP-0005MY-Lx; Tue, 17 Feb 2026 20:53:03 -0500", "from ip-10-5-6-203.us-west-2.compute.internal (HELO\n smtpout.naws.us-west-2.prod.farcaster.email.amazon.dev) ([10.5.6.203])\n by internal-pdx-out-011.esa.us-west-2.outbound.mail-perimeter.amazon.com with\n ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Feb 2026 01:52:54 +0000", "from EX19MTAUWB001.ant.amazon.com [205.251.233.51:16402]\n by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.55.107:2525]\n with esmtp (Farcaster)\n id 37763521-d57a-4bf4-8565-5edb81b6cdf3;\n Wed, 18 Feb 2026 01:52:54 +0000 (UTC)", "from EX19D020UWC004.ant.amazon.com (10.13.138.149) by\n EX19MTAUWB001.ant.amazon.com (10.250.64.248) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.35;\n Wed, 18 Feb 2026 01:52:54 +0000", "from ip-10-253-83-51.amazon.com (172.19.99.218) by\n EX19D020UWC004.ant.amazon.com (10.13.138.149) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.35;\n Wed, 18 Feb 2026 01:52:51 +0000" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2;\n t=1771379581; x=1802915581;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=uVNVDznm7NxQ+bwTqP9jZD0VXeg2067NIquqLqqPp8k=;\n b=UXRY5C0G990DBgrw/dvKvQujZca4G5QBODoCfh1ikdtEG9cTAbVUlRZ9\n SZnv1lYQn3U/RuD1Lw7nmAiZUW3iTt8xd5WLMB2m8vhX/32zil0GfdpPS\n iU67TWv6lRkG1leUY8k+U5vr1PIfxn4ZG6oHe84Tu6TvECqnoKhbp9pAa\n GZkJsSFqlUSRFlFrhqdzepIi/qC1T0D2tEqKJUb0VGuP2NgzzxMQmRdaD\n Zqb1dbRi1Sh0zOMg+Er9bF3CvUvjy77tALU5Y+uFaXObSvZ3Y8zUH8mAi\n 3fP0k0ed0Raw0u29596c5q587ee6HWLdaA1Ztc9LRr17rJ01zIbzrHHeN g==;", "X-CSE-ConnectionGUID": "ec2gWyq0ToGqRTSbtgy7Gw==", "X-CSE-MsgGUID": "CyXLfvGWR6OfJac8E+6vEQ==", "X-IronPort-AV": "E=Sophos;i=\"6.21,297,1763424000\"; d=\"scan'208\";a=\"13037355\"", "X-Farcaster-Flow-ID": "37763521-d57a-4bf4-8565-5edb81b6cdf3", "From": "Alexander Graf <graf@amazon.com>", "To": "<qemu-devel@nongnu.org>", "CC": "<qemu-arm@nongnu.org>, Peter Maydell <peter.maydell@linaro.org>, \"Thomas\n Huth\" <thuth@redhat.com>, <alex.bennee@linaro.org>, <philmd@linaro.org>,\n <berrange@redhat.com>, <marcandre.lureau@redhat.com>, Cornelia Huck\n <cohuck@redhat.com>, <mst@redhat.com>, Dorjoy Chowdhury\n <dorjoychy111@gmail.com>, Pierrick Bouvier <pierrick.bouvier@linaro.org>,\n Paolo Bonzini <pbonzini@redhat.com>, Tyler Fanelli <tfanelli@redhat.com>,\n <mknaust@amazon.com>, <nh-open-source@amazon.com>", "Subject": "[PATCH 06/10] target/arm/cpu64: Allow -host for nitro", "Date": "Wed, 18 Feb 2026 01:51:46 +0000", "Message-ID": "<20260218015151.4052-7-graf@amazon.com>", "X-Mailer": "git-send-email 2.47.1", "In-Reply-To": "<20260218015151.4052-1-graf@amazon.com>", "References": "<20260218015151.4052-1-graf@amazon.com>", "MIME-Version": "1.0", "X-Originating-IP": "[172.19.99.218]", "X-ClientProxiedBy": "EX19D032UWA001.ant.amazon.com (10.13.139.62) To\n EX19D020UWC004.ant.amazon.com (10.13.138.149)", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Received-SPF": "pass client-ip=52.35.192.45;\n envelope-from=prvs=502105d20=graf@amazon.de;\n helo=pdx-out-011.esa.us-west-2.outbound.mail-perimeter.amazon.com", "X-Spam_score_int": "-19", "X-Spam_score": "-2.0", "X-Spam_bar": "--", "X-Spam_report": "(-2.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.043,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,\n HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_NONE=-0.0001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_NONE=0.001, T_SPF_PERMERROR=0.01,\n UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "The nitro accel does not actually make use of CPU emulation or details:\nIt always uses the host CPU regardless of configuration. Machines for\nthe nitro accel select the host CPU type as default to have a clear\nstatement of the above and to have a unified cpu type across all\nsupported architectures.\n\nThe arm64 logic on Linux currently only allows -cpu host for KVM based\nvirtual machines. Add a special case for nitro so that when the nitro\naccel is active, it allows use of the host cpu type.\n\nSigned-off-by: Alexander Graf <graf@amazon.com>\n---\n target/arm/cpu64.c | 8 ++++++++\n 1 file changed, 8 insertions(+)", "diff": "diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c\nindex 5d7c6b7fbb..c01051f038 100644\n--- a/target/arm/cpu64.c\n+++ b/target/arm/cpu64.c\n@@ -765,6 +765,14 @@ static void aarch64_a53_initfn(Object *obj)\n static void aarch64_host_initfn(Object *obj)\n {\n ARMCPU *cpu = ARM_CPU(obj);\n+\n+#if defined(CONFIG_NITRO)\n+ if (nitro_enabled()) {\n+ /* The nitro accel uses -cpu host, but does not actually consume it */\n+ return;\n+ }\n+#endif\n+\n #if defined(CONFIG_KVM)\n kvm_arm_set_cpu_features_from_host(cpu);\n if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {\n", "prefixes": [ "06/10" ] }