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From:   Itaru Kitayama <itaru.kitayama@gmail.com>
Date:   Thu, 2 Mar 2023 07:12:24 +0900
Message-ID: <CANW9uysnvGCwANu+_6dp9+3rvHGOkThT9d0K2qpQV4exdmYWoA@mail.gmail.com>
Subject: Re: [RFC] Support for Arm CCA VMs on Linux
To:     Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc:     Suzuki K Poulose <suzuki.poulose@arm.com>,
        linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, kvmarm@lists.linux.dev,
        linux-arm-kernel@lists.infradead.org,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Andrew Jones <andrew.jones@linux.dev>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Chao Peng <chao.p.peng@linux.intel.com>,
        Christoffer Dall <christoffer.dall@arm.com>,
        Fuad Tabba <tabba@google.com>,
        James Morse <james.morse@arm.com>,
        Joey Gouly <Joey.Gouly@arm.com>, Marc Zyngier <maz@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Oliver Upton <oliver.upton@linux.dev>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Quentin Perret <qperret@google.com>,
        Sean Christopherson <seanjc@google.com>,
        Steven Price <steven.price@arm.com>,
        Thomas Huth <thuth@redhat.com>, Will Deacon <will@kernel.org>,
        Zenghui Yu <yuzenghui@huawei.com>, kvmarm@lists.cs.columbia.edu
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On Wed, Mar 1, 2023 at 6:20 PM Jean-Philippe Brucker
<jean-philippe@linaro.org> wrote:
>
> Hi Itaru,
>
> On Wed, Mar 01, 2023 at 08:35:05AM +0900, Itaru Kitayama wrote:
> > Hi Jean,
> > I've tried your series in Real on CCA Host, but the KVM arch init
> > emits an Invalid argument error and terminates.
>
> Do you know which call returns this error?  Normally the RMEGuest support
> should print more detailed errors. Are you able to launch normal guests
> (without the rme-guest object and confidential-guest-support machine
> parameter)?  Could you give the complete QEMU command-line?

No, I cant say which. Yes, the CCA-capable QEMU boots if I don't set
RME-related options.

Here's mine (based upon your command-line):
qemu-system-aarch64 -cpu host -accel kvm -machine
virt,gic-version=3,confidential-guest-support=rme0 -smp 2 -m 256M
-nographic -object rme-guest,id=rme0,measurement-algo=sha512 -kernel
Image -initrd rootfs.ext2 -append 'console=ttyAMA0 earlycon'
-overcommit mem-lock=on

Itaru.
>
> > I configure it with the aarch64-softmmu target only and built, any
> > other steps I should worry?
>
> No, that should be enough
>
> Thanks,
> Jean