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Mon, 09 Dec 2024 09:45:29 -0800 (PST) Received: from dianders.sjc.corp.google.com ([2620:15c:9d:2:5dfc:4b08:57c5:2948]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7fd53ff4900sm1397667a12.50.2024.12.09.09.45.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Dec 2024 09:45:28 -0800 (PST) From: Douglas Anderson To: Catalin Marinas , Will Deacon , Mark Rutland Cc: Julius Werner , Jeffrey Hugo , Roxana Bradescu , bjorn.andersson@oss.qualcomm.com, linux-arm-kernel@lists.infradead.org, Trilok Soni , linux-arm-msm@vger.kernel.org, Douglas Anderson , linux-kernel@vger.kernel.org Subject: [PATCH 2/6] arm64: errata: Add QCOM_KRYO_2XX_GOLD to the spectre_bhb_firmware_mitigated_list Date: Mon, 9 Dec 2024 09:43:12 -0800 Message-ID: <20241209094310.2.Ia3dfc0afadbfbee81bb2efb0672262470973dd08@changeid> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241209174430.2904353-1-dianders@chromium.org> References: <20241209174430.2904353-1-dianders@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Qualcomm Kryo 200-series Gold cores appear to have a derivative of an ARM Cortex A73 in them. Since A73 needs Spectre mitigation then the Kyro 200-series Gold cores also should need Spectre mitigation. Signed-off-by: Douglas Anderson --- I don't really have any good way to test this patch but it seems likely it's needed. If nothing else the claim is that that Qualcomm Kyro 280 CPU is vulnerable [1] but I don't see any mitigations in the kernel for it. NOTE: presumably this patch won't actually do much on its own because (I believe) it requires a firmware update to go with it. [1] https://spectreattack.com/spectre.pdf arch/arm64/kernel/proton-pack.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pac= k.c index e149efadff20..0437be7c83bc 100644 --- a/arch/arm64/kernel/proton-pack.c +++ b/arch/arm64/kernel/proton-pack.c @@ -925,6 +925,7 @@ static bool is_spectre_bhb_fw_affected(int scope) static const struct midr_range spectre_bhb_firmware_mitigated_list[] =3D { MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), MIDR_ALL_VERSIONS(MIDR_CORTEX_A75), + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_GOLD), {}, }; bool cpu_in_list =3D is_midr_in_range_list(read_cpuid_id(), --=20 2.47.0.338.g60cca15819-goog