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

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Date:   Fri, 3 Mar 2023 09:46:18 +0000
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Itaru Kitayama <itaru.kitayama@...il.com>
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 Thu, Mar 02, 2023 at 07:12:24AM +0900, Itaru Kitayama wrote:
> > > I've tried your series in Real on CCA Host, but the KVM arch init
> > > emits an Invalid argument error and terminates.

This was the KVM_SET_ONE_REG for the SVE vector size. During my tests I
didn't enable SVE in the host but shrinkwrap enables more options.

Until we figure out support for SVE, disable it on the QEMU command-line
(similarly to '--disable-sve' needed for kvmtool boot):

	-cpu host,sve=off

Thanks,
Jean