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+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <[email protected]>
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+Date: Thu, 12 Aug 2021 11:52:42 +0200
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+Subject: [PATCH] arm64: don't issue HVC on boot
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+MIME-Version: 1.0
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+Content-Type: text/plain; charset=UTF-8
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+Content-Transfer-Encoding: 8bit
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+
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+Broadcom's CFE loader seems to miss setting SCR_EL3.HCE which results in
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+generating an UNDEF and kernel panic on the first HVC.
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+
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+HVC gets issued by kernels 5.12+ while booting, by kexec and KVM. Until
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+someone finds a workaround we have to avoid all above.
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+
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+Workarounds: 0c93df9622d4 ("arm64: Initialise as nVHE before switching to VHE")
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+Signed-off-by: Rafał Miłecki <[email protected]>
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+---
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+ arch/arm64/kernel/hyp-stub.S | 2 +-
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+ 1 file changed, 1 insertion(+), 1 deletion(-)
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+
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+--- a/arch/arm64/kernel/hyp-stub.S
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++++ b/arch/arm64/kernel/hyp-stub.S
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+@@ -238,7 +238,7 @@ SYM_FUNC_START(switch_to_vhe)
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+
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+ // Turn the world upside down
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+ mov x0, #HVC_VHE_RESTART
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+- hvc #0
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++// hvc #0
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+ 1:
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+ ret
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+ SYM_FUNC_END(switch_to_vhe)
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Rafał Miłecki