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

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Message-Id: <3750C774-62A4-4D02-8C07-6C98304F32F3@goldelico.com>
Date:   Mon, 7 Sep 2020 15:29:40 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     David Brazdil <dbrazdil@...gle.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marc Zyngier <maz@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [BUG]: KVM: arm64: Fix symbol dependency in __hyp_call_panic_nvhe

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));
  ^

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.

With a git revert 34f379956e9d7 on v5.8.7 I can compile without problems.

So something seems to be incomplete or premature with the backport.

BR and thanks,
Nikolaus Schaller