Commit 3d0ad09412ffe00c9afa201d01effdb6023d09b4 ("drivers/net: Disable
UFO through virtio") breaks live migration of KVM guests from older to
newer host kernels:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d0ad09412ffe00c9afa201d01effdb6023d09b4
The problem occurs
On Tue, 2014-11-11 at 10:58 +, Stefan Hajnoczi wrote:
> Commit 3d0ad09412ffe00c9afa201d01effdb6023d09b4 ("drivers/net: Disable
> UFO through virtio") breaks live migration of KVM guests from older to
> newer host kernels:
>
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/comm
On Tue, 2014-11-04 at 09:35 +, Shannon Zhao wrote:
> As the current virtio-mmio only support single irq,
> so some advanced features such as vhost-net with irqfd
> are not supported. And the net performance is not
> the best without vhost-net and irqfd supporting.
Could you, please, help under
Hi Ming,
On 11.11.2014 08:56, Ming Lei wrote:
> On Tue, Nov 11, 2014 at 7:31 AM, Jens Axboe wrote:
> > Known, I'm afraid, Ming is looking into it.
Actually I had also tried to reproduce this bug, without success.
But today I happened to know how to trigger the bug, by coincidence,
during testing
On Tue, Nov 11, 2014 at 12:17:26PM +, Ben Hutchings wrote:
> On Tue, 2014-11-11 at 10:58 +, Stefan Hajnoczi wrote:
> > Commit 3d0ad09412ffe00c9afa201d01effdb6023d09b4 ("drivers/net: Disable
> > UFO through virtio") breaks live migration of KVM guests from older to
> > newer host kernels:
>
From: "Michael S. Tsirkin"
Date: Tue, 11 Nov 2014 17:57:50 +0200
> Basically userspace assumed that features will only
> ever be added, never removed, so this change is
> breaking it.
I essentially agree.
We can't just toss feature bits like this which have been present for so
long.
"There is
On Tue, Nov 11, 2014 at 11:42 PM, Dongsu Park
wrote:
> Hi Ming,
>
> On 11.11.2014 08:56, Ming Lei wrote:
>> On Tue, Nov 11, 2014 at 7:31 AM, Jens Axboe wrote:
>> > Known, I'm afraid, Ming is looking into it.
>
> Actually I had also tried to reproduce this bug, without success.
> But today I happe
On Tue, 2014-11-11 at 17:57 +0200, Michael S. Tsirkin wrote:
> On Tue, Nov 11, 2014 at 12:17:26PM +, Ben Hutchings wrote:
> > On Tue, 2014-11-11 at 10:58 +, Stefan Hajnoczi wrote:
> > > Commit 3d0ad09412ffe00c9afa201d01effdb6023d09b4 ("drivers/net: Disable
> > > UFO through virtio") breaks
This reverts commit 88e0e0e5aa722b193c8758c8b45d041de5316924 for
the tap drivers, but leaves UFO disabled in virtio_net.
libvirt at least assumes that tap features will never be dropped
in new kernel versions, and doing so prevents migration of VMs to
the never kernel version while they are runnin
From: Ben Hutchings
Date: Tue, 11 Nov 2014 17:12:58 +
> This reverts commit 88e0e0e5aa722b193c8758c8b45d041de5316924 for
> the tap drivers, but leaves UFO disabled in virtio_net.
>
> libvirt at least assumes that tap features will never be dropped
> in new kernel versions, and doing so preve
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Amos Kong writes:
> From: Rusty Russell
>
> current_rng holds one reference, and we bump it every time we want
> to do a read from it.
>
> This means we only hold the rng_mutex to grab or drop a reference,
> so accessing /sys/devices/virtual/misc/hw_random/rng_current doesn't
> block on read of /
Amos Kong writes:
> From: Rusty Russell
>
> The previous patch added one potential problem: we can still be
> reading from a hwrng when it's unregistered. Add a wait for zero
> in the hwrng_unregister path.
>
> v4: add cleanup_done flag to insure that cleanup is done
That's a bit weird. The us
On Mon, Nov 10, 2014 at 09:47:27PM +0800, Herbert Xu wrote:
> On Mon, Nov 03, 2014 at 11:56:24PM +0800, Amos Kong wrote:
> >
> > @@ -98,6 +99,8 @@ static inline void cleanup_rng(struct kref *kref)
> >
> > if (rng->cleanup)
> > rng->cleanup(rng);
>
> You need a compiler barrier he
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