linux-kernel - Re: [RFC] Support for Arm CCA VMs on Linux

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Date:   Thu, 2 Mar 2023 07:12:24 +0900
From:   Itaru Kitayama <itaru.kitayama@...il.com>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc:     Suzuki K Poulose <suzuki.poulose@....com>,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        Alexandru Elisei <alexandru.elisei@....com>,
        Andrew Jones <andrew.jones@...ux.dev>,
        Catalin Marinas <catalin.marinas@....com>,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Christoffer Dall <christoffer.dall@....com>,
        Fuad Tabba <tabba@...gle.com>,
        James Morse <james.morse@....com>,
        Joey Gouly <Joey.Gouly@....com>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Steven Price <steven.price@....com>,
        Thomas Huth <thuth@...hat.com>, Will Deacon <will@...nel.org>,
        Zenghui Yu <yuzenghui@...wei.com>, kvmarm@...ts.cs.columbia.edu
Subject: Re: [RFC] Support for Arm CCA VMs on Linux

On Wed, Mar 1, 2023 at 6:20 PM Jean-Philippe Brucker
<jean-philippe@...aro.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