b7616307b7
Include SLE feature requests, misc upstream stable bug fixes, and repair Jira feature references OBS-URL: https://build.opensuse.org/request/show/762845 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=521
43 lines
1.7 KiB
Diff
43 lines
1.7 KiB
Diff
From: Niek Linnenbank <nieklinnenbank@gmail.com>
|
|
Date: Mon, 2 Dec 2019 22:09:43 +0100
|
|
Subject: arm/arm-powerctl: set NSACR.{CP11, CP10} bits in arm_set_cpu_on()
|
|
|
|
Git-commit: 0c7f8c43daf6556078e51de98aa13f069e505985
|
|
|
|
This change ensures that the FPU can be accessed in Non-Secure mode
|
|
when the CPU core is reset using the arm_set_cpu_on() function call.
|
|
The NSACR.{CP11,CP10} bits define the exception level required to
|
|
access the FPU in Non-Secure mode. Without these bits set, the CPU
|
|
will give an undefined exception trap on the first FPU access for the
|
|
secondary cores under Linux.
|
|
|
|
This is necessary because in this power-control codepath QEMU
|
|
is effectively emulating a bit of EL3 firmware, and has to set
|
|
the CPU up as the EL3 firmware would.
|
|
|
|
Fixes: fc1120a7f5
|
|
Cc: qemu-stable@nongnu.org
|
|
Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com>
|
|
[PMM: added clarifying para to commit message]
|
|
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
|
|
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
|
|
Signed-off-by: Bruce Rogers <brogers@suse.com>
|
|
---
|
|
target/arm/arm-powerctl.c | 3 +++
|
|
1 file changed, 3 insertions(+)
|
|
|
|
diff --git a/target/arm/arm-powerctl.c b/target/arm/arm-powerctl.c
|
|
index f77a950db67276513977af686aa9..b064513d44a86932bbd70b06b3ca 100644
|
|
--- a/target/arm/arm-powerctl.c
|
|
+++ b/target/arm/arm-powerctl.c
|
|
@@ -104,6 +104,9 @@ static void arm_set_cpu_on_async_work(CPUState *target_cpu_state,
|
|
/* Processor is not in secure mode */
|
|
target_cpu->env.cp15.scr_el3 |= SCR_NS;
|
|
|
|
+ /* Set NSACR.{CP11,CP10} so NS can access the FPU */
|
|
+ target_cpu->env.cp15.nsacr |= 3 << 10;
|
|
+
|
|
/*
|
|
* If QEMU is providing the equivalent of EL3 firmware, then we need
|
|
* to make sure a CPU targeting EL2 comes out of reset with a
|