Blame patches.suse/arm64-Clear-OSDLR_EL1-on-CPU-boot.patch
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Ivan T. Ivanov |
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From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
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Ivan T. Ivanov |
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Date: Mon, 8 Apr 2019 18:17:18 +0100
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Ivan T. Ivanov |
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Subject: arm64: Clear OSDLR_EL1 on CPU boot
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Ivan T. Ivanov |
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Git-commit: 6fda41bf12615ee7c3ddac88155099b1a8cf8d00
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Ivan T. Ivanov |
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Patch-mainline: v5.2-rc1
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Ivan T. Ivanov |
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References: git-fixes
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Ivan T. Ivanov |
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Ivan T. Ivanov |
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Some firmwares may reboot CPUs with OS Double Lock set. Make sure that
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Ivan T. Ivanov |
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it is unlocked, in order to use debug exceptions.
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Ivan T. Ivanov |
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Ivan T. Ivanov |
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Cc: <stable@vger.kernel.org>
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Ivan T. Ivanov |
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Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
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Ivan T. Ivanov |
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Signed-off-by: Will Deacon <will.deacon@arm.com>
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Ivan T. Ivanov |
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Acked-by: Ivan T. Ivanov <iivanov@suse.de>
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Ivan T. Ivanov |
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---
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arch/arm64/kernel/debug-monitors.c | 1 +
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Ivan T. Ivanov |
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1 file changed, 1 insertion(+)
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Ivan T. Ivanov |
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Ivan T. Ivanov |
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--- a/arch/arm64/kernel/debug-monitors.c
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+++ b/arch/arm64/kernel/debug-monitors.c
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@@ -134,6 +134,7 @@ NOKPROBE_SYMBOL(disable_debug_monitors);
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*/
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static int clear_os_lock(unsigned int cpu)
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{
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+ write_sysreg(0, osdlr_el1);
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Ivan T. Ivanov |
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write_sysreg(0, oslar_el1);
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Ivan T. Ivanov |
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isb();
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Ivan T. Ivanov |
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return 0;
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