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[PATCH 0/1] target/arm: Fix SCR_EL3 migration issue

From: Mike Nawrocki
Subject: [PATCH 0/1] target/arm: Fix SCR_EL3 migration issue
Date: Thu, 28 Jan 2021 09:31:01 -0500

The SCR_EL3 register reset value (0)  and the value produced when
writing 0 via the scr_write function (set as writefn in the register
struct) differ. This causes migration to fail.

I believe the solution is to specify a raw_writefn for that register.

Failing invocation:
$ qemu-system-arm -machine vexpress-a9 -cpu cortex-a9 -nographic
QEMU 5.2.0 monitor - type 'help' for more information
(qemu) migrate "exec:cat > img"
(qemu) q
$ qemu-system-arm -machine vexpress-a9 -cpu cortex-a9 -nographic -incoming 
"exec:cat img"
qemu-system-arm: error while loading state for instance 0x0 of device 'cpu'
qemu-system-arm: load of migration failed: Operation not permitted

Mike Nawrocki (1):
  target/arm: Add raw_writefn to SCR_EL3 register

 target/arm/helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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