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From: | Thomas Huth |
Subject: | Re: [qemu-s390x] [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 08:31:16 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 |
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... Thomas
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