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Fri, 07 Feb 2025 22:57:36 +0000 (GMT) Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA04.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 517MvZeb001765 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 7 Feb 2025 22:57:35 GMT Received: from [10.110.94.65] (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 7 Feb 2025 14:57:31 -0800 Message-ID: <04adfe6c-5f04-4e28-a52d-b8cb5654771a@quicinc.com> Date: Fri, 7 Feb 2025 14:57:30 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/5] arm64: errata: Add KRYO 2XX/3XX/4XX silver cores to Spectre BHB safe list To: Douglas Anderson , Catalin Marinas , Will Deacon , Mark Rutland CC: Roxana Bradescu , Julius Werner , , , Florian Fainelli , , Jeffrey Hugo , Scott Bauer , , James Morse , References: <20250107200715.422172-1-dianders@chromium.org> <20250107120555.v4.3.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid> Content-Language: en-US From: Trilok Soni In-Reply-To: <20250107120555.v4.3.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: BmfbeKS-e0ck2Bd04tpftWN13s_vAgSN X-Proofpoint-GUID: BmfbeKS-e0ck2Bd04tpftWN13s_vAgSN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-07_11,2025-02-07_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 bulkscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 mlxlogscore=718 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502070173 On 1/7/2025 12:06 PM, Douglas Anderson wrote: > Qualcomm has confirmed that, much like Cortex A53 and A55, KRYO > 2XX/3XX/4XX silver cores are unaffected by Spectre BHB. Add them to > the safe list. > > > Fixes: 558c303c9734 ("arm64: Mitigate spectre style branch history side channels") > Cc: stable@vger.kernel.org > Cc: Scott Bauer > Signed-off-by: Douglas Anderson > --- > > Changes in v4: > - Re-added KRYO 2XX/3XX/4XX silver patch after Qualcomm confirmed. > > Changes in v3: > - Removed KRYO 2XX/3XX/4XX silver patch. > > Changes in v2: > - New > > arch/arm64/kernel/proton-pack.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c > index 17aa836fe46d..89405be53d8f 100644 > --- a/arch/arm64/kernel/proton-pack.c > +++ b/arch/arm64/kernel/proton-pack.c > @@ -854,6 +854,9 @@ static bool is_spectre_bhb_safe(int scope) > MIDR_ALL_VERSIONS(MIDR_CORTEX_A510), > MIDR_ALL_VERSIONS(MIDR_CORTEX_A520), > MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), > + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER), > + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), > + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), > {}, > }; > static bool all_safe = true; Acked-by: Trilok Soni -- ---Trilok Soni