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vhost-user-i2c on xen x86

To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>

From: "Mavila, Sudheesh" <Sudheesh.Mavila@xxxxxxx>

Date: Sun, 28 Aug 2022 18:28:49 +0000

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Thread-topic: vhost-user-i2c on xen x86

[AMD Official Use Only - General]

Hi All,

I tried to run vhost-user-i2c on X86 machine according to the page https://lists.gnu.org/archive/html/qemu-devel/2021-03/msg08379.html

The aim is to access i2c device from VM.

How can I pass the below arguments to boot the VM using xl tool? Which is the recommended way to access i2c bus from VM on x86?

-chardev socket,path=vi2c.sock,id=vi2c \

-device vhost-user-i2c-pci,chardev=vi2c,id=i2c

I tried to pass this arguments as below, but failed to boot the VM

device_model_args_hvm = [ "-chardev", "socket","path=vi2c.sock0","id=vi2c" ]

device_model_args_hvm = [ "-device", "vhost-user-i2c-pci","chardev=vi2c","id=i2c" ]

compiled qemu with the i2c-backend patch

./vhost-user-i2c --socket-path=vi2c.sock --device-list 0:57

vhost-user-i2c-Message: 19:23:00.434: awaiting connection to vi2c.sock

host : test

release : 5.18.0

version : #137 SMP PREEMPT_DYNAMIC Fri Aug 26 15:04:03 IST 2022

machine : x86_64

nr_cpus : 4

max_cpu_id : 15

nr_nodes : 1

cores_per_socket : 2

threads_per_core : 2

cpu_mhz : 2595.174

hw_caps : 178bf3ff:76d8320b:2e500800:244033ff:0000000f:209c01a9:00000000:00000500

virt_caps : pv hvm hvm_directio pv_directio hap shadow gnttab-v1 gnttab-v2

total_memory : 14234

free_memory : 269

sharing_freed_memory : 0

sharing_used_memory : 0

outstanding_claims : 0

free_cpus : 0

xen_major : 4

xen_minor : 16

xen_extra : .0

xen_version : 4.16.0

xen_caps : xen-3.0-x86_64 hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64

xen_scheduler : credit2

xen_pagesize : 4096

platform_params : virt_start=0xffff800000000000

xen_changeset : Tue Nov 30 11:42:42 2021 +0000 git:b0b4661fa3-dirty

xen_commandline : placeholder no-real-mode edd=off

cc_compiler : gcc (Ubuntu 10.3.0-15ubuntu1) 10.3.0

cc_compile_by : root

cc_compile_domain :

cc_compile_date : Fri Aug 26 18:27:08 IST 2022

build_id : d1e031cd177cfb054ac36a8872af15f6be926c56

xend_config_format : 4

test@test:~$ /usr/local/lib/xen/bin/qemu-system-i386 --version

QEMU emulator version 6.1.0

Thanks in advance.

Regards,

Sudheesh