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Subject: Re: lib/x86_64/handlers.S:20: Error: unrecognized instruction `call
 route_exception'
To:     Sean Christopherson <seanjc@google.com>,
        kernel test robot <lkp@intel.com>
Cc:     Aaron Lewis <aaronlewis@google.com>, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org, Alexander Graf <graf@amazon.com>
References: <202107270520.DIJjv4ia-lkp@intel.com>
 <YQAvVGwJqUak1E0l@google.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <65701bf2-e980-6cf7-8263-5eed7ba338ac@redhat.com>
Date:   Tue, 27 Jul 2021 20:51:26 +0200
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On 27/07/21 18:07, Sean Christopherson wrote:
> On Tue, Jul 27, 2021, kernel test robot wrote:
>> Hi Aaron,
>>
>> First bad commit (maybe != root cause):
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   ff1176468d368232b684f75e82563369208bc371
>> commit: 29faeb9632012d6c3fa4aa33c3d589b9ff18b206 selftests: kvm: Add exception handling to selftests
>> date:   9 months ago
>> config: openrisc-randconfig-s031-20210726 (attached as .config)
>> compiler: or1k-linux-gcc (GCC) 10.3.0
>> reproduce:
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          # apt-get install sparse
>>          # sparse version: v0.6.3-341-g8af24329-dirty
>>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29faeb9632012d6c3fa4aa33c3d589b9ff18b206
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout 29faeb9632012d6c3fa4aa33c3d589b9ff18b206
>>          # save the attached .config to linux build tree
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross C=1
>>          CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=openrisc
>>          SHELL=/bin/bash -C tools/testing/selftests install
> 
> KVM's selftests don't play nice with cross-compiles for unsupported architectures.
> arm64 and s390 have expilict x86_64 -> {arm64,s390} support from commit 66d69e081b52
> ("selftests: fix kvm relocatable native/cross builds and installs"), but for
> anything else the Makefile assumes an x86_64 target.
> 
> Realistically, only test bots are going to run afoul of our laziness.  Do we care
> enough to fix this up properly?

Seems easy enough, I will give it a shot.

Paolo