linux-kernel - Re: [BUG]: KVM: arm64: Fix symbol dependency in __hyp_call_panic

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Date:   Mon, 7 Sep 2020 16:42:02 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     David Brazdil <dbrazdil@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [BUG]: KVM: arm64: Fix symbol dependency in __hyp_call_panic_nvhe

Hi,

> Am 07.09.2020 um 16:22 schrieb Sasha Levin <sashal@...nel.org>:
> 
> On Mon, Sep 07, 2020 at 03:29:40PM +0200, H. Nikolaus Schaller wrote:
>> Hi,
>> it seems as if your patch
>> 
>> 34f379956e9d7 ("KVM: arm64: Fix symbol dependency in __hyp_call_panic_nvhe")
>> [ Upstream commit b38b298aa4397e2dc74a89b4dd3eac9e59b64c96 ]
>> 
>> fails to compile in v5.8.7 for me (using an aarch64 gcc 4.9 cross-toolchain to try
>> to build a kernel for the PinePhone):
>> 
>> CC      arch/arm64/kvm/hyp/switch.o - due to target missing
>> arch/arm64/kvm/hyp/switch.c: In function 'hyp_panic':
>> arch/arm64/kvm/hyp/switch.c:904:2: error: impossible constraint in 'asm'
>> asm volatile("ldr %0, =%1" : "=r" (str_va) : "S" (__hyp_panic_string));
>> ^
> 
> Does upstream build correctly for you?

It is 100% upstream code in arch/arm64, just with a private config.
diff --stat arch/arm64 shows only 2 dts and 2 config files. It did
compile well with v5.8.5 and just broke after merge v5.8.7.

> 
>> I can find the commit b38b298aa4397e2dc74a89b4dd3eac9e59b64c96 in upstream
>> but not the affected file. There is also "KVM: arm64: Split hyp/switch.c to VHE/nVHE"
>> which does a cleanup and rename and v5.9-rc4 compiles fine.
> 
> Right, it got moved around in upstream.

Maybe this has fixed something...

BR and thanks,
Nikolaus