linux-kernel - [PATCH 2/6] arm64: errata: Add QCOM_KRYO_2XX_GOLD to the spectre_bhb_firmware_mitigated

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Message-ID: <20241209094310.2.Ia3dfc0afadbfbee81bb2efb0672262470973dd08@changeid>
Date: Mon,  9 Dec 2024 09:43:12 -0800
From: Douglas Anderson <dianders@...omium.org>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>
Cc: Julius Werner <jwerner@...omium.org>,
	Jeffrey Hugo <quic_jhugo@...cinc.com>,
	Roxana Bradescu <roxabee@...gle.com>,
	bjorn.andersson@....qualcomm.com,
	linux-arm-kernel@...ts.infradead.org,
	Trilok Soni <quic_tsoni@...cinc.com>,
	linux-arm-msm@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] arm64: errata: Add QCOM_KRYO_2XX_GOLD to the spectre_bhb_firmware_mitigated_list

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 <dianders@...omium.org>
---
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-pack.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[] = {
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A75),
+		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_GOLD),
 		{},
 	};
 	bool cpu_in_list = is_midr_in_range_list(read_cpuid_id(),
-- 
2.47.0.338.g60cca15819-goog