lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:   Sun,  3 Oct 2021 20:13:41 -0700
From:   Max Filippov <>
Cc:     Chris Zankel <>,,
        Guenter Roeck <>,
        Max Filippov <>
Subject: [PATCH] xtensa: xtfpga: Try software restart before simulating CPU reset

From: Guenter Roeck <>

Rebooting xtensa images loaded with the '-kernel' option in qemu does
not work. When executing a reboot command, the qemu session either hangs
or experiences an endless sequence of error messages.

  Kernel panic - not syncing: Unrecoverable error in exception handler

Reset code jumps to the CPU restart address, but Linux can not recover
from there because code and data in the kernel init sections have been
discarded and overwritten at this point.

XTFPGA platforms have a means to reset the CPU by writing 0xdead into a
specific FPGA IO address. When used in QEMU the kernel image loaded with
the '-kernel' option gets restored to its original state allowing the
machine to boot successfully.

Use that mechanism to attempt a platform reset. If it does not work,
fall back to the existing mechanism.

Signed-off-by: Guenter Roeck <>
Signed-off-by: Max Filippov <>
 arch/xtensa/platforms/xtfpga/setup.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/xtensa/platforms/xtfpga/setup.c b/arch/xtensa/platforms/xtfpga/setup.c
index 4f7d6142d41f..9b1e36b06530 100644
--- a/arch/xtensa/platforms/xtfpga/setup.c
+++ b/arch/xtensa/platforms/xtfpga/setup.c
@@ -51,8 +51,12 @@ void platform_power_off(void)
 void platform_restart(void)
-	/* Flush and reset the mmu, simulate a processor reset, and
-	 * jump to the reset vector. */
+	/* Try software reset first. */
+	*((unsigned int *)XTFPGA_SWRST_VADDR) = 0xdead;
+	/* If software reset did not work, flush and reset the mmu,
+	 * simulate a processor reset, and jump to the reset vector.
+	 */
 	/* control never gets here */

Powered by blists - more mailing lists