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Re: [Qemu-devel] [Android-virt] [PATCH 00/12] Add support for Cortex-A15


From: Peter Maydell
Subject: Re: [Qemu-devel] [Android-virt] [PATCH 00/12] Add support for Cortex-A15 and vexpress-a15
Date: Tue, 17 Jan 2012 19:08:03 +0000

On 15 January 2012 22:56, Christoffer Dall <address@hidden> wrote:
> On Fri, Jan 13, 2012 at 3:57 PM, Peter Maydell <address@hidden> 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... :)

vexpress-a15 now in qemu-linaro git tree. However it doesn't boot under
KVM:

address@hidden:~# /usr/local/bin/qemu-system-arm  -enable-kvm
-kernel /a15-no-lpae-uImage  -m 128 -serial stdio -drive
if=sd,file=/maz/vex
press.img -M vexpress-a15 -display none -append "console=ttyAMA0
earlyprintk rootwait mem=128M root=/dev/mmcblk0p2 rw --debug"
Uncompressing Linux... done, booting the kernel.
Booting Linux on physical CPU 0
Linux version 3.1.0+ (address@hidden) (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=10c5387f
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

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

...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.

-- PMM



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