* [Query] Does Linux & Qemu support KVM for ARM32 guest on ARM64 host
[not found] <BE.E9.04928.D4C61275@epcpsbgx1.samsung.com>
@ 2016-04-28 2:33 ` Shannon Zhao
0 siblings, 0 replies; 2+ messages in thread
From: Shannon Zhao @ 2016-04-28 2:33 UTC (permalink / raw)
To: linux-arm-kernel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
[parent not found: <708585848.188261461823397987.JavaMail.weblogic@ep2mlwas06d>]
* [Query] Does Linux & Qemu support KVM for ARM32 guest on ARM64 host
[not found] <708585848.188261461823397987.JavaMail.weblogic@ep2mlwas06d>
@ 2016-04-28 6:46 ` Peter Maydell
0 siblings, 0 replies; 2+ messages in thread
From: Peter Maydell @ 2016-04-28 6:46 UTC (permalink / raw)
To: linux-arm-kernel
On 28 April 2016 at 07:03, RAVINDRA KUMAR SANDE <r.sande@samsung•com> wrote:
> I have another query, for Arm32 host with KVM enabled.
> I see that "qemu-system-arm -enable-kvm -machine vexpress-a9 ..." gives error
> kmv_init_vcpu (IOCtl on /dev/kvm) failed, guest not supported.
>
> Is there any way to emulate vexpress-a9 with -enable-kvm on qemu ?
No. You can only emulate a CPU of the same type as the host
you're using, and the vexpress-a9 must use a Cortex-A9 CPU,
so it can't be used under virtualization.
thanks
-- PMM
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2016-04-28 2:33 ` [Query] Does Linux & Qemu support KVM for ARM32 guest on ARM64 host Shannon Zhao
[not found] <708585848.188261461823397987.JavaMail.weblogic@ep2mlwas06d>
2016-04-28 6:46 ` Peter Maydell
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