diff options
| -rw-r--r-- | target/linux/bcm4908/patches-5.15/301-arm64-don-t-issue-HVC-on-boot.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/target/linux/bcm4908/patches-5.15/301-arm64-don-t-issue-HVC-on-boot.patch b/target/linux/bcm4908/patches-5.15/301-arm64-don-t-issue-HVC-on-boot.patch new file mode 100644 index 0000000000..d167c2ed00 --- /dev/null +++ b/target/linux/bcm4908/patches-5.15/301-arm64-don-t-issue-HVC-on-boot.patch @@ -0,0 +1,30 @@ +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Thu, 12 Aug 2021 11:52:42 +0200 +Subject: [PATCH] arm64: don't issue HVC on boot +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Broadcom's CFE loader seems to miss setting SCR_EL3.HCE which results in +generating an UNDEF and kernel panic on the first HVC. + +HVC gets issued by kernels 5.12+ while booting, by kexec and KVM. Until +someone finds a workaround we have to avoid all above. + +Workarounds: 0c93df9622d4 ("arm64: Initialise as nVHE before switching to VHE") +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +--- + arch/arm64/kernel/hyp-stub.S | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/arch/arm64/kernel/hyp-stub.S ++++ b/arch/arm64/kernel/hyp-stub.S +@@ -238,7 +238,7 @@ SYM_FUNC_START(switch_to_vhe) + + // Turn the world upside down + mov x0, #HVC_VHE_RESTART +- hvc #0 ++// hvc #0 + 1: + ret + SYM_FUNC_END(switch_to_vhe) |