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Subject: Re: [Qemu-devel] [Android-virt] [PATCH 00/12] Add support for
 Cortex-A15 and vexpress-a15
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Christoffer Dall <cdall@cs.columbia.edu>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "android-virt@lists.cs.columbia.edu" <android-virt@lists.cs.columbia.edu>, "patches@linaro.org" <patches@linaro.org>

On 17/01/12 19:08, Peter Maydell wrote:
> On 15 January 2012 22:56, Christoffer Dall <cdall@cs.columbia.edu> wrote:
>> On Fri, Jan 13, 2012 at 3:57 PM, Peter Maydell <peter.maydell@linaro.org=
> wrote:
>>> PPS: these patches are against qemu-master so for kvm you'd need
>>> to (a) rebase them on qemu-linaro (b) put the kvm patches on top
>>> of these (c) wait for me to do a. for you ;-)
>>
>> ok, I'll test this with the most recent KVM changes soon and also look
>> forward for your merge... :)
>=20
> vexpress-a15 now in qemu-linaro git tree. However it doesn't boot under
> KVM:
>=20
> root@LinaroE102767:~# /usr/local/bin/qemu-system-arm  -enable-kvm
> -kernel /a15-no-lpae-uImage  -m 128 -serial stdio -drive
> if=3Dsd,file=3D/maz/vex
> press.img -M vexpress-a15 -display none -append "console=3DttyAMA0
> earlyprintk rootwait mem=3D128M root=3D/dev/mmcblk0p2 rw --debug"
> Uncompressing Linux... done, booting the kernel.
> Booting Linux on physical CPU 0
> Linux version 3.1.0+ (petmay01@LinaroE102767) (gcc version 4.6.1
> (Ubuntu/Linaro 4.6.1-9ubuntu3) ) #19 SMP Fri Jan 13 12:23:22 GMT 2012
> CPU: ARMv7 Processor [412fc0f1] revision 1 (ARMv7), cr=3D10c5387f
> CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
> Machine: ARM-Versatile Express
> SoC: ARM VE Platform
> bootconsole [earlycon0] enabled
> Memory policy: ECC disabled, Data cache writealloc
> error: kvm run failed Invalid argument
> Aborted
>=20
> Under TCG the next thing printed is
> ct_ca15x4_init_cpu_map: ncores 1
> Architected timer frequency not available
> sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
>=20
> ...possibly the kernel side needs to implement the A15 L2 cache control
> register, which is where the guest kernel picks up the number of cores
> from; see patch 10 for the TCG version.

I've pushed a new branch (kvm-v3.3-rc1) to my arm-platforms repo. It
contains a fix (or shall we call it a horrible hack?) for the above.

=09M.
--=20
Jazz is not dead. It just smells funny...