linux-kernel - [PATCH 4.9 10/44] arm64: Clear OSDLR

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Message-Id: <20190520115232.246013965@linuxfoundation.org>
Date:   Mon, 20 May 2019 14:13:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 4.9 10/44] arm64: Clear OSDLR_EL1 on CPU boot

From: Jean-Philippe Brucker <jean-philippe.brucker@....com>

commit 6fda41bf12615ee7c3ddac88155099b1a8cf8d00 upstream.

Some firmwares may reboot CPUs with OS Double Lock set. Make sure that
it is unlocked, in order to use debug exceptions.

Cc: <stable@...r.kernel.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@....com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/kernel/debug-monitors.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -132,6 +132,7 @@ NOKPROBE_SYMBOL(disable_debug_monitors);
  */
 static int clear_os_lock(unsigned int cpu)
 {
+	write_sysreg(0, osdlr_el1);
 	write_sysreg(0, oslar_el1);
 	isb();
 	return 0;