From: Shannon Zhao <zhaoshenglong@huawei.com>
To: r.sande@samsung.com,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
qemu-arm@nongnu.org
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Marc Zyngier <marc.zyngier@arm.com>,
Andre Przywara <andre.przywara@arm.com>,
qemu-devel@nongnu.org,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [Qemu-devel] [Query] Does Linux & Qemu support KVM for ARM32 guest on ARM64 host
Date: Thu, 28 Apr 2016 10:33:50 +0800 [thread overview]
Message-ID: <5721768E.407@huawei.com> (raw)
In-Reply-To: <BE.E9.04928.D4C61275@epcpsbgx1.samsung.com>
On 2016/4/28 9:50, RAVINDRA KUMAR SANDE wrote:
>
> What I did :
> 1) Just for investigation, I took a ARMv8 ( OdroidC2 ) board
> 2) I compiled Linux 3.14 with KVM support for this ARMv8 ( OdroidC2 )
> board, with modification replacing meson_timer by arm timer in its dts
> file.
> Why Linux 3.14 : I took Linux 3.14 because display drivers for this
> board are officially for this version; and I am interested in seeing
> some Linux guest booting with display on.
> 3) I see from boot log of that KVM is initialized successfully, and I
> can see /dev/kvm node.
> 4) I built latest Qemu with --enable-kvm on this board natively.
>
> What I find :
> 1) running "qemu-system-arm -enable-kvm -machine vexpress-a9 ...."
> gives error : no accelerator found
> 2) running "qemu-system-aarch64 -enable-kvm -machine vexpress-a9 ...."
> gives error : kmv_init_vcpu (IOCtl on /dev/kvm) failed, guest not supported
> ( I experimented some modifications as well to overcome above error,
> such as replacing value assigned to cpu->kvm_target etc, but IOCtl call
> is failing)
>
> Query:
> 1) Does Arm64 Linux not enable KVM support for Arm32 guest ?
> 2) Can qemu-system-arm not use the KVM feature on Arm64 host ?
> 3) Can qemu-system-aarch64 not use KVM feature for Arm32 guest ?
>
You can use below command to boot a ARM32 guest on ARM64：
qemu-system-aarch64 -enable-kvm -machine virt,kernel_irqchip=on -cpu
host,aarch64=off ....
--
Shannon
next parent reply other threads:[~2016-04-28 2:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <BE.E9.04928.D4C61275@epcpsbgx1.samsung.com>
2016-04-28 2:33 ` Shannon Zhao [this message]
2016-04-28 6:03 [Qemu-devel] [Query] Does Linux & Qemu support KVM for ARM32 guest on ARM64 host RAVINDRA KUMAR SANDE
2016-04-28 6:46 ` Peter Maydell
-- strict thread matches above, loose matches on Subject: below --
2016-04-28 1:50 RAVINDRA KUMAR SANDE
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