Re: [Qemu-devel] [PULL 11/27] arm: Allow system registers for KVM guests to be changed by QEMU code

[Auger Eric]

Hi Peter,

On 3/11/19 2:26 PM, Peter Maydell wrote:
> On Thu, 21 Feb 2019 at 14:20, Auger Eric <address@hidden> wrote:
>> This commit introduces a regression when running with EDK2 FW:
>>
>> I get the following traces:
>>
>> error: kvm run failed Function not implemented
> 
> Unfortunately I can't repro this, on a Mustang host with
> 4.8.0-42-generic host kernel, with this command line:
> 
>  ./build/kvm/aarch64-softmmu/qemu-system-aarch64  -M
> virt,gic-version=host -cpu host -smp 2 -m 4G -display none
> --enable-kvm  -serial stdio -bios
> ~/QEMU_EFI_cbuild_debug_feb21_2019.fd
> 
> Does that simplified command line still repro the problem
> for you on your hardware, or does the bug require all
> the extra stuff with blk and net devices and a real
> guest filesystem to trigger? (You'll need to revert the
> revert commit 942f99c825fc94c8b1a4, obivously.)
> 
> More generally, can you strip the repro command line
> down as much as possible to something that still shows
> the bug? I'd rather not have to sort out getting TAP networking
> on this box if it isn't actually a necessary component of
> reproducing the bug :-)

yes I hit the bug with your reduced command line:

aarch64-softmmu/qemu-system-aarch64 -M virt,gic-version=host -cpu host
-smp 2 -m 4G -display none --enable-kvm  -serial stdio -bios
~/VM/UEFI/QEMU_EFI_cbuild_debug_feb21_2019.fd

[285347.260500] kvm [82944]: load/store instruction decoding not implemented

InstallProtocolInterface: CE345171-BA0B-11D2-8E4F-00A0C969723B 13E6C2F20
 BlockSize : 262144
 LastBlock : FF
error: kvm run failed Function not implemented
 PC=000000013f5a6004 X00=0000000000000000 X01=000000013e7310b0
X02=000000013f5a6004 X03=00000000404003c5 X04=0000000000000000
X05=0000000096000046 X06=000000013f828210 X07=000000013f828310
X08=000000013f8504c8 X09=0000000400000000 X10=000000013d6c1000
X11=000000013f297fff X12=0000000000000000 X13=0000000000000008
X14=0000000000000002 X15=00000000000000ff X16=000000013f872da0
X17=00000000ffffa6ab X18=0000000000000000 X19=0000000009000000
X20=000000013f5a7a78 X21=000000000000003a X22=000000013f5a7ab2
X23=0000000009000018 X24=000000013f631090 X25=0000000000000010
X26=0000000000000100 X27=000000013f89501b X28=000000013e7311b0
X29=000000013e7313e0 X30=000000013f5a5e40  SP=000000013f7bdf60
PSTATE=804003c5 N--- EL1h

Thanks

Eric

> 
> thanks
> -- PMM
>