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Re: [Qemu-devel] [PATCH v1 for-2.13 2/4] pc-bios/s390-ccw/net: Stop virt
From: |
Christian Borntraeger |
Subject: |
Re: [Qemu-devel] [PATCH v1 for-2.13 2/4] pc-bios/s390-ccw/net: Stop virtio-net device before jumping into the OS |
Date: |
Fri, 20 Apr 2018 09:25:37 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 |
On 04/20/2018 08:31 AM, Thomas Huth wrote:
> On 19.04.2018 17:49, Christian Borntraeger wrote:
>> On 04/18/2018 02:31 PM, Thomas Huth wrote:
>>> The virtio-net receive buffers are filled asynchronously, so we should
>>> make sure to properly shut down the virtio-net device before we jump into
>>> the loaded kernel. Otherwise an incoming packet could destroy memory of
>>> the OS kernel if it did not re-initialize the virtio-net device fast
>>> enough yet.
>>
>> The normal bios does a full subsystem reset before we enter the OS.
>> (see jump_to_IPL_code the diag 308). That should reset all virtio
>> devices on the qemu level. Shouldnt we rather do the same for
>> the net bios?
>
> That should fix this issue, too, right. I'll give it a try and include
> it in v2 if I can make it work...
The advantage is that it also put the sclp console into a default state.
>
> Thomas
>
- [Qemu-devel] [PATCH v1 for-2.13 0/4] pc-bios/s390-ccw: Network boot improvements, Thomas Huth, 2018/04/18
- [Qemu-devel] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Thomas Huth, 2018/04/18
- Re: [Qemu-devel] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Viktor VM Mihajlovski, 2018/04/19
- Re: [Qemu-devel] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Thomas Huth, 2018/04/19
- Re: [Qemu-devel] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Viktor VM Mihajlovski, 2018/04/19
- Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Thomas Huth, 2018/04/19
- Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Viktor VM Mihajlovski, 2018/04/20
- Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Thomas Huth, 2018/04/20
- Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Viktor VM Mihajlovski, 2018/04/20
- Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Thomas Huth, 2018/04/20
- Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.13 3/4] pc-bios/s390-ccw/net: Add support for pxelinux-style config files, Viktor VM Mihajlovski, 2018/04/20