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[Qemu-devel] Re: persistent tun & different virtual NICs & dead guest ne
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: persistent tun & different virtual NICs & dead guest network |
Date: |
Thu, 9 Jul 2009 21:13:17 +0300 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Sun, Apr 05, 2009 at 03:12:04PM +0300, Avi Kivity wrote:
> Avi Kivity wrote:
>>> I think all the settings should be reset to 0
>>> when opening the tun device.
>>
>> This should definitely be fixed. I'll look at writing a patch.
>>
>
> Okay, that's not in upstream qemu, so I committed a fix to
> kvm-userspace.git.
>
> Attached if you want to test it.
>
> --
> error compiling committee.c: too many arguments to function
>
> >From 25971710409c374e9486c960c297f324a9164a65 Mon Sep 17 00:00:00 2001
> From: Avi Kivity <address@hidden>
> Date: Sun, 5 Apr 2009 15:08:55 +0300
> Subject: [PATCH] kvm: qemu: clear tap features on initialization
>
> tap features change how tap interprets data, so they must be cleared on
> initialization to prevent old settings from interfering with new guest
> instances.
>
> Signed-off-by: Avi Kivity <address@hidden>
> ---
> qemu/net.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/qemu/net.c b/qemu/net.c
> index d753fa0..703d01c 100644
> --- a/qemu/net.c
> +++ b/qemu/net.c
> @@ -930,6 +930,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan,
> #endif
> #ifdef TUNSETOFFLOAD
> s->vc->set_offload = tap_set_offload;
> + tap_set_offload(s->vc, 0, 0, 0, 0);
BTW, should not these bits be restored on load?
I couldn't find code that does this.
> #endif
> qemu_set_fd_handler2(s->fd, tap_can_send, tap_send, NULL, s);
> snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd);
Looks good to me. Just a thought: do we want kernel to give us an
option to tie the offload bits to the character device, so that it gets
cleaned automatically when qemu dies?
--
MST
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