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Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback
From: |
Daniel P . Berrangé |
Subject: |
Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback |
Date: |
Mon, 27 Jun 2022 16:03:09 +0100 |
User-agent: |
Mutt/2.2.6 (2022-06-05) |
On Wed, Jun 22, 2022 at 03:34:52PM -0400, Peter Xu wrote:
> On Wed, Jun 22, 2022 at 07:39:06PM +0100, Dr. David Alan Gilbert (git) wrote:
> > diff --git a/migration/qemu-file.c b/migration/qemu-file.c
> > index 74f919de67..e206b05550 100644
> > --- a/migration/qemu-file.c
> > +++ b/migration/qemu-file.c
> > @@ -377,8 +377,22 @@ static ssize_t qemu_fill_buffer(QEMUFile *f)
> > return 0;
> > }
> >
> > - len = f->ops->get_buffer(f->ioc, f->buf + pending,
> > f->total_transferred,
> > - IO_BUF_SIZE - pending, &local_error);
> > + do {
> > + len = qio_channel_read(f->ioc,
> > + (char *)f->buf + pending,
> > + IO_BUF_SIZE - pending,
> > + &local_error);
> > + if (len == QIO_CHANNEL_ERR_BLOCK) {
> > + if (qemu_in_coroutine()) {
> > + qio_channel_yield(f->ioc, G_IO_IN);
> > + } else {
> > + qio_channel_wait(f->ioc, G_IO_IN);
> > + }
> > + } else if (len < 0) {
> > + len = EIO;
>
> This should be -EIO.
>
> > + }
> > + } while (len == QIO_CHANNEL_ERR_BLOCK);
>
> It's failing only with the new TLS test I added for postcopy somehow (at
> least /x86_64/migration/postcopy/recovery/tls).. I also verified after the
> change it'll work again.
Assuming you can still reproduce the pre-existing flaw, can you capture
a stack trace when it hangs. I'm wondering if it is a sign that the
migration is not converging when using TLS under certain load conditions,
because the test waits forever for converge.
Also what scenario are you running in ? Bare metal or a VM, and what
host arch ? Wondering if the machine is at all slow, or for example
missing AES hardware acceleration or some such thing.
With regards,
Daniel
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- [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, (continued)
- [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Dr. David Alan Gilbert (git), 2022/06/22
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Peter Xu, 2022/06/22
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Peter Xu, 2022/06/22
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Daniel P . Berrangé, 2022/06/23
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Peter Xu, 2022/06/23
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Daniel P . Berrangé, 2022/06/27
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Daniel P . Berrangé, 2022/06/27
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Peter Xu, 2022/06/27
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Daniel P . Berrangé, 2022/06/23
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Dr. David Alan Gilbert, 2022/06/23
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback,
Daniel P . Berrangé <=
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Peter Xu, 2022/06/27
- Re: [PULL 22/33] migration: remove the QEMUFileOps 'get_buffer' callback, Daniel P . Berrangé, 2022/06/28
[PULL 29/33] softmmu/dirtylimit: Implement vCPU dirtyrate calculation periodically, Dr. David Alan Gilbert (git), 2022/06/22
[PULL 31/33] softmmu/dirtylimit: Implement virtual CPU throttle, Dr. David Alan Gilbert (git), 2022/06/22
[PULL 33/33] tests: Add dirty page rate limit test, Dr. David Alan Gilbert (git), 2022/06/22
[PULL 20/33] migration: remove the QEMUFileOps 'set_blocking' callback, Dr. David Alan Gilbert (git), 2022/06/22
[PULL 26/33] accel/kvm/kvm-all: Refactor per-vcpu dirty ring reaping, Dr. David Alan Gilbert (git), 2022/06/22
[PULL 32/33] softmmu/dirtylimit: Implement dirty page rate limit, Dr. David Alan Gilbert (git), 2022/06/22
[PULL 25/33] migration: remove the QEMUFileOps abstraction, Dr. David Alan Gilbert (git), 2022/06/22
[PULL 21/33] migration: remove the QEMUFileOps 'close' callback, Dr. David Alan Gilbert (git), 2022/06/22