From: Niek Linnenbank <nieklinnenbank@gmail.com>
To: "Peter Maydell" <peter.maydell@linaro.org>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Cc: Beniamino Galvani <b.galvani@gmail.com>,
qemu-arm <qemu-arm@nongnu.org>,
QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [PATCH 06/10] arm/arm-powerctl: set NSACR.{CP11, CP10} bits in arm_set_cpu_on()
Date: Fri, 13 Dec 2019 21:52:21 +0100 [thread overview]
Message-ID: <CAPan3Wqw0enwMDd8ZmEDU=JeC+XQCZvfxaoEVtVJd9tsP3=Qww@mail.gmail.com> (raw)
In-Reply-To: <CAPan3WrYWpa2ymBjy5zCWAEdeVXVRYo7arNVOXWsbFeTAi0ucA@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 2793 bytes --]
Hi Peter,
Philippe discovered that this patch triggers an hflags assertion error when
building QEMU
with debugging enabled (--enable-debug and --extra-cflags=-ggdb).
See this thread for details:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg665049.html
What I added to resolve that is to call arm_rebuild_hflags() after setting
CP10,CP11.
However I'm not sure of any other side effects because I just don't know
this area of the code very well.
Regards,
Niek
diff --git a/target/arm/arm-powerctl.c b/target/arm/arm-powerctl.c
index f77a950db6..cf2f3d69ab 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
@@ -124,6 +127,9 @@ static void arm_set_cpu_on_async_work(CPUState
*target_cpu_state,
target_cpu->env.regs[0] = info->context_id;
}
+ /* Ensure hflags is rebuild */
+ arm_rebuild_hflags(&target_cpu->env);
+
/* Start the new CPU at the requested address */
cpu_set_pc(target_cpu_state, info->entry);
On Fri, Dec 6, 2019 at 9:01 PM Niek Linnenbank <nieklinnenbank@gmail.com>
wrote:
> Hey Peter,
>
> On Fri, Dec 6, 2019 at 3:25 PM Peter Maydell <peter.maydell@linaro.org>
> wrote:
>
>> On Mon, 2 Dec 2019 at 21:10, Niek Linnenbank <nieklinnenbank@gmail.com>
>> wrote:
>> >
>> > 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.
>> >
>> > Fixes: fc1120a7f5
>> > Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com>
>> > ---
>>
>> Oops, another place where we failed to realise the ramifications
>> of making NSACR actually do something.
>>
>> Since this is a bugfix I'm going to fish it out of this patchset
>> and apply it to target-arm.next with a cc: stable.
>>
>> Thanks for the catch!
>>
>
> Sure, I'm happy to help. Note that I only tested this fix with
> the Allwinner H3 SoC patches that I'm working on.
>
> OK, I'll keep an eye out for it. Once it is solved in master, I'll remove
> this patch from the patch series.
>
> Regards,
> Niek
>
>>
>> -- PMM
>>
>
>
> --
> Niek Linnenbank
>
>
--
Niek Linnenbank
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next prev parent reply other threads:[~2019-12-13 21:26 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 21:09 [PATCH 00/10] Add Allwinner H3 SoC and Orange Pi PC Machine Niek Linnenbank
2019-12-02 21:09 ` [PATCH 01/10] hw: arm: add Allwinner H3 System-on-Chip Niek Linnenbank
2019-12-04 16:53 ` Philippe Mathieu-Daudé
2019-12-04 20:44 ` Niek Linnenbank
2019-12-10 9:02 ` Philippe Mathieu-Daudé
2019-12-10 19:17 ` Niek Linnenbank
2019-12-02 21:09 ` [PATCH 02/10] hw: arm: add Xunlong Orange Pi PC machine Niek Linnenbank
2019-12-03 9:17 ` Philippe Mathieu-Daudé
2019-12-03 19:33 ` Niek Linnenbank
2019-12-04 9:03 ` Philippe Mathieu-Daudé
2019-12-04 19:50 ` Niek Linnenbank
2019-12-05 22:15 ` Niek Linnenbank
2019-12-06 5:41 ` Philippe Mathieu-Daudé
2019-12-06 22:15 ` Niek Linnenbank
2019-12-10 8:59 ` Philippe Mathieu-Daudé
2019-12-10 19:14 ` Niek Linnenbank
2019-12-02 21:09 ` [PATCH 03/10] arm: allwinner-h3: add Clock Control Unit Niek Linnenbank
2019-12-13 0:03 ` Philippe Mathieu-Daudé
2019-12-02 21:09 ` [PATCH 04/10] arm: allwinner-h3: add USB host controller Niek Linnenbank
2019-12-04 16:11 ` Aleksandar Markovic
2019-12-04 20:20 ` Niek Linnenbank
2019-12-10 7:56 ` Philippe Mathieu-Daudé
2019-12-10 8:29 ` Gerd Hoffmann
2019-12-10 19:11 ` Niek Linnenbank
2019-12-02 21:09 ` [PATCH 05/10] arm: allwinner-h3: add System Control module Niek Linnenbank
2019-12-13 0:09 ` Philippe Mathieu-Daudé
2019-12-15 23:27 ` Niek Linnenbank
2019-12-16 0:17 ` Philippe Mathieu-Daudé
2019-12-02 21:09 ` [PATCH 06/10] arm/arm-powerctl: set NSACR.{CP11, CP10} bits in arm_set_cpu_on() Niek Linnenbank
2019-12-06 14:24 ` Peter Maydell
2019-12-06 20:01 ` Niek Linnenbank
2019-12-13 20:52 ` Niek Linnenbank [this message]
2019-12-02 21:09 ` [PATCH 07/10] arm: allwinner-h3: add CPU Configuration module Niek Linnenbank
2019-12-02 21:09 ` [PATCH 08/10] arm: allwinner-h3: add Security Identifier device Niek Linnenbank
2019-12-06 14:27 ` Peter Maydell
2019-12-06 16:35 ` Philippe Mathieu-Daudé
2019-12-06 20:20 ` Niek Linnenbank
2019-12-02 21:09 ` [PATCH 09/10] arm: allwinner-h3: add SD/MMC host controller Niek Linnenbank
2019-12-11 22:34 ` Niek Linnenbank
2019-12-12 23:56 ` Philippe Mathieu-Daudé
2019-12-13 21:00 ` Niek Linnenbank
2019-12-14 13:59 ` Philippe Mathieu-Daudé
2019-12-14 20:32 ` Niek Linnenbank
2019-12-15 23:07 ` Niek Linnenbank
2019-12-16 0:14 ` Philippe Mathieu-Daudé
2019-12-16 19:46 ` Niek Linnenbank
2019-12-16 21:28 ` Philippe Mathieu-Daudé
2019-12-02 21:09 ` [PATCH 10/10] arm: allwinner-h3: add EMAC ethernet device Niek Linnenbank
2019-12-03 9:33 ` KONRAD Frederic
2019-12-03 19:41 ` Niek Linnenbank
2019-12-04 15:14 ` Philippe Mathieu-Daudé
2019-12-04 15:22 ` KONRAD Frederic
2019-12-03 8:47 ` [PATCH 00/10] Add Allwinner H3 SoC and Orange Pi PC Machine Philippe Mathieu-Daudé
2019-12-03 19:25 ` Niek Linnenbank
2019-12-10 8:40 ` Philippe Mathieu-Daudé
2019-12-09 21:37 ` Niek Linnenbank
2019-12-10 8:26 ` Philippe Mathieu-Daudé
2019-12-10 20:12 ` Niek Linnenbank
2019-12-12 23:07 ` Niek Linnenbank
2019-12-12 23:25 ` Philippe Mathieu-Daudé
2019-12-13 20:45 ` Niek Linnenbank
2019-12-03 9:02 ` Philippe Mathieu-Daudé
2019-12-03 19:32 ` Niek Linnenbank
2019-12-06 14:16 ` Peter Maydell
2019-12-09 22:24 ` Aleksandar Markovic
2019-12-10 10:34 ` KONRAD Frederic
2019-12-10 19:55 ` Niek Linnenbank
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