From nobody Sat Nov 15 11:35:45 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=reject dis=none) header.from=unpredictable.fr ARC-Seal: i=1; a=rsa-sha256; t=1753111829; cv=none; d=zohomail.com; s=zohoarc; b=k7tbgUhrn7cLczki/igCUUHc4kwFSIZm86Pgz3ue7GFpBhVIRn+0JE+IqC5GJVT585cn/bBKH99DXkaNXA4NHzHxoove1cSUzEGyQSaWy/gdM6xYgHp0IVi6OoO/LOQ1T7ajhcMuQ+3R187c/KD/GbSoG0cdxrvMc1XhQziwYQA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1753111829; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=jUuG2nWJYMdDKWpXlx5PRoGJVPTWdBjLgl1UQZhKdl0=; b=K6SXsZzFg7ltbx+wtFoRp1W+U+iEF0E9f6y82AR7RsrLm2wbgxbnlTOmimAnh0KWzmxVtF+XhKRMcoYZC5cft+anT3SAy61TtH8Skf81iFa/FZCxzblk7VDm/Ppf6527oQM3DGX0eFs/9J7dkDRe4/z4vT+ny2HZg+I2Jm6r4po= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=reject dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1753111829539616.4882107120203; Mon, 21 Jul 2025 08:30:29 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1udsS6-0000Rl-HI; Mon, 21 Jul 2025 11:29:18 -0400 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 1udsS1-0000Jq-5D for qemu-devel@nongnu.org; Mon, 21 Jul 2025 11:29:14 -0400 Received: from p-east3-cluster7-host2-snip4-9.eps.apple.com ([57.103.84.150] helo=outbound.qs.icloud.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1udsRy-0008DR-D2 for qemu-devel@nongnu.org; Mon, 21 Jul 2025 11:29:12 -0400 Received: from outbound.qs.icloud.com (unknown [127.0.0.2]) by p00-icloudmta-asmtp-us-east-2d-100-percent-7 (Postfix) with ESMTPS id 8B6B91800615; Mon, 21 Jul 2025 15:29:07 +0000 (UTC) Received: from localhost.localdomain (qs-asmtp-me-k8s.p00.prod.me.com [17.57.155.37]) by p00-icloudmta-asmtp-us-east-2d-100-percent-7 (Postfix) with ESMTPSA id C238218000B7; Mon, 21 Jul 2025 15:29:05 +0000 (UTC) Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr; s=sig1; bh=jUuG2nWJYMdDKWpXlx5PRoGJVPTWdBjLgl1UQZhKdl0=; h=From:To:Subject:Date:Message-Id:MIME-Version:x-icloud-hme; b=elo4QUoUzwHTIK3J9o6jjQHaXjZtO6Vp1fadREoWwCNdL/UPDbOwXn1+ExZJG4KYP5I6Z4KDRJKly2kaEwlNcAU4jWGMO+XPnmySLb9z2TzOx8/P8m/VFh33NUDVJ21Xf/Fty3a+vXp5iEzrTtCX+p3Y3BgN3XRU2gGvc7IQ5ODPKJAYcBvqbJwKROAfQPboDzcrHAMMWxM1ddoPyQZVs9IivMY7JQuiZOX3kFzFfRPQ6SYaPCCJKnSQxgKd6ugzgc6Jviex6C4P6D/iGG9n7aaX3PNbdYtySFsKn0vS+dw3n41RJlb1J6wjQ3Sd5Rr8lwmx5fc9E0W72dAHZEq1MA== X-Client-IP: 46.189.47.18 From: Mohamed Mediouni To: qemu-devel@nongnu.org Cc: Alexander Graf , Mads Ynddal , Peter Maydell , qemu-arm@nongnu.org, Mohamed Mediouni Subject: [PATCH 1/2] target/arm: hvf: add timer frequency note Date: Mon, 21 Jul 2025 17:29:01 +0200 Message-Id: <20250721152902.38671-2-mohamed@unpredictable.fr> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250721152902.38671-1-mohamed@unpredictable.fr> References: <20250721152902.38671-1-mohamed@unpredictable.fr> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: _xWChcKvkEqUFlZpnK8SVXzVKUW_EsGE X-Proofpoint-GUID: _xWChcKvkEqUFlZpnK8SVXzVKUW_EsGE X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzIxMDEzOCBTYWx0ZWRfX2bKfgI5R8NHw 4pbLhq9FrKC1jegtJ/OuyUKw7+fFIERFNdmyoAtsMUFzHA5gLZEd+2/ZIqTAzjEVx8wmRfc1VeU E1UiptYExtcYg6l2rPRkvG7nwhBkEkzh6zSZEBA3GyZ4Fflkjzx1gzKCk4oG0pOkIcyi+8NJ+mU vUi0MfI13H2W22uWgLXdE1HTMNI6Bm5TEflFKMI9TWk+/Wr0pmwZYI7pdKnFEkKmdOOzNtLSYk4 68E0TzW+A03j4rPMYCjf78VyiyP4gQ+6awCetFLezqw9uU68EAzJL/+YKGgWvs+S3iTC+9Lko= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-21_04,2025-07-21_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 bulkscore=0 clxscore=1030 suspectscore=0 mlxscore=0 mlxlogscore=816 spamscore=0 phishscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.22.0-2506270000 definitions=main-2507210138 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=57.103.84.150; envelope-from=mohamed@unpredictable.fr; helo=outbound.qs.icloud.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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @unpredictable.fr) X-ZM-MESSAGEID: 1753111834031116600 Content-Type: text/plain; charset="utf-8" On Apple M3 and later, the timer frequency within apps and VM guests are di= fferent from each other. Note that app binaries compiled with older SDKs continue to retain a non-1 = GHz timer frequency on Apple M3/M4. Signed-off-by: Mohamed Mediouni --- target/arm/hvf/hvf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index c9cfcdc08b..4331a3386a 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -1018,6 +1018,13 @@ int hvf_arch_init_vcpu(CPUState *cpu) int i; =20 env->aarch64 =3D true; + /* + * TODO: This does not correspond to the exposed generic + * timer frequency to the guest on Apple M3/M4. + * This is due to a scaled 1GHz counter being exposed + * to applications built with newer SDKs when running + * on that silicon, while VMs get an unscaled counter. + */ asm volatile("mrs %0, cntfrq_el0" : "=3Dr"(arm_cpu->gt_cntfrq_hz)); =20 /* Allocate enough space for our sysreg sync */ --=20 2.39.5 (Apple Git-154)