linux-kernel - Re: [PATCH v5 00/43] arm64: Support for Arm CCA in KVM

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Message-Id: <4313C668-D48C-4443-917E-67A112BE1C37@linux.dev>
Date: Mon, 2 Dec 2024 19:42:35 +0900
From: Itaru Kitayama <itaru.kitayama@...ux.dev>
To: Jean-Philippe Brucker <jean-philippe@...aro.org>,
 Steven Price <steven.price@....com>
Cc: kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev,
 Catalin Marinas <catalin.marinas@....com>,
 Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>,
 James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>,
 Suzuki K Poulose <suzuki.poulose@....com>,
 Zenghui Yu <yuzenghui@...wei.com>,
 linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org,
 Joey Gouly <joey.gouly@....com>,
 Alexandru Elisei <alexandru.elisei@....com>,
 Christoffer Dall <christoffer.dall@....com>,
 Fuad Tabba <tabba@...gle.com>,
 linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 Gavin Shan <gshan@...hat.com>,
 Shanker Donthineni <sdonthineni@...dia.com>,
 Alper Gun <alpergun@...gle.com>,
 "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v5 00/43] arm64: Support for Arm CCA in KVM

Hi Jean, Steven,

> On Dec 2, 2024, at 19:26, Jean-Philippe Brucker <jean-philippe@...aro.org> wrote:
> 
> On Mon, Dec 02, 2024 at 08:54:11AM +0000, Steven Price wrote:
>> Hi Itaru,
>> 
>> On 02/12/2024 05:10, Itaru Kitayama wrote:
>>> On Fri, Oct 04, 2024 at 04:27:21PM +0100, Steven Price wrote:
>>>> This series adds support for running protected VMs using KVM under the
>>>> Arm Confidential Compute Architecture (CCA).
>> ...
>>> 
>>> On FVP, the v5+v7 kernel is unable to execute virt-manager:
>>> 
>>> Starting install...
>>> Allocating 'test9.qcow2'                                    |    0 B  00:00 ...
>>> Removing disk 'test9.qcow2'                                 |    0 B  00:00
>>> ERROR    internal error: process exited while connecting to monitor: 2024-12-04T18:56:11.646168Z qemu-system-aarch64: -accel kvm: ioctl(KVM_CREATE_VM) failed: Invalid argument
>>> 2024-12-04T18:56:11.646520Z qemu-system-aarch64: -accel kvm: failed to initialize kvm: Invalid argument
>>> Domain installation does not appear to have been successful.
>> 
>> Can you check that the kernel has detected the RMM being available, you
>> should have a message like below when the host kernel is booting:
>> 
>> kvm [1]: RMI ABI version 1.0
>> 
>> My guess is that you've got mismatched versions of the RMM and TF-A. The
>> interface between those two components isn't stable and there were
>> breaking changes fairly recently. And obviously if the RMM hasn't
>> initialised successfully then confidential VMs won't be available.
>> 
>>> Below is my virt-manager options:
>>> 
>>> virt-install --machine=virt --arch=aarch64 --name=test9 --memory=2048 --vcpu=1 --nographic --check all=off --features acpi=off --virt-type kvm --boot kernel=Image-cca,initrd=rootfs.cpio,kernel_args='earlycon console=ttyAMA0 rdinit=/sbin/init rw root=/dev/vda acpi=off' --qemu-commandline='-M virt,confidential-guest-support=rme0,gic-version=3 -cpu host -object rme-guest,id=rme0 -nodefaults' --disk size=4 --import --osinfo detect=on,require=off
>>> 
>>> Userland is Ubuntu 24.10, the VMM is Linaro's cca/2024-11-20:
>>> 
>>> https://git.codelinaro.org/linaro/dcap/qemu/-/tree/cca/2024-11-20?ref_type=heads
> 
> Indeed, QEMU branch 2024-11-20 has to be used with an older version of the
> KVM patch and older RMM. For KVM v5+v7 you need the most recent QEMU
> branch, confusingly called cca/v3 (because it's the third patch series).
> 
> Thanks,
> Jean

I wasn’t applying with the updated Shrinkwrap’s overlay file when building TF-RMM.
With the correct VMM as you guys mentioned (cca/v3) I was able to start the installation via
the virt-install interacting with the Ubuntu 24.10’s monolitihc libvirtd.

Thanks,
Itaru.

> 
>> 
>> I don't think this is the latest QEMU tree, Jean-Philippe posted an
>> update last week:
>> 
>> https://lore.kernel.org/qemu-devel/20241125195626.856992-2-jean-philippe@linaro.org/
>> 
>> I'm not sure if there were any important updates there, but there are
>> detailed instructions that might help.
>> 
>> Regards,
>> Steve