From: Bruce Richardson <bruce.richardson@intel.com>
To: Ilya Maximets <i.maximets@samsung.com>
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>,
dev@dpdk.org, tiwei.bie@intel.com, zhihong.wang@intel.com,
jfreimann@redhat.com, dgilbert@redhat.com,
Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [dpdk-dev] [04/12] vhost: introduce postcopy's advise message
Date: Fri, 28 Sep 2018 14:24:27 +0100 [thread overview]
Message-ID: <20180928132426.GA20200@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <20180928131524eucas1p174f4057454f99c035b2025c4a7c7dec1~YkqhekGjc3150031500eucas1p1X@eucas1p1.samsung.com>
On Fri, Sep 28, 2018 at 04:17:34PM +0300, Ilya Maximets wrote:
> On 28.09.2018 15:13, Bruce Richardson wrote:
> > On Fri, Sep 28, 2018 at 01:40:25PM +0300, Ilya Maximets wrote:
> >> On 27.09.2018 11:28, Ilya Maximets wrote:
> >>> On 26.09.2018 10:26, Maxime Coquelin wrote:
> >>>> This patch opens a userfaultfd and sends it back to Qemu's
> >>>> VHOST_USER_POSTCOPY_ADVISE request.
> >>>>
> >>>> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> >>>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >>>> ---
> >>>> lib/librte_vhost/vhost.h | 2 ++
> >>>> lib/librte_vhost/vhost_user.c | 37 +++++++++++++++++++++++++++++++++++
> >>>> lib/librte_vhost/vhost_user.h | 3 ++-
> >>>> 3 files changed, 41 insertions(+), 1 deletion(-)
> >>>>
> >>>> diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
> >>>> index 25ffd7614..21722d8a8 100644
> >>>> --- a/lib/librte_vhost/vhost.h
> >>>> +++ b/lib/librte_vhost/vhost.h
> >>>> @@ -363,6 +363,8 @@ struct virtio_net {
> >>>> int slave_req_fd;
> >>>> rte_spinlock_t slave_req_lock;
> >>>>
> >>>> + int postcopy_ufd;
> >>>> +
> >>>> /*
> >>>> * Device id to identify a specific backend device.
> >>>> * It's set to -1 for the default software implementation.
> >>>> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> >>>> index a9b429598..bdfe2cac0 100644
> >>>> --- a/lib/librte_vhost/vhost_user.c
> >>>> +++ b/lib/librte_vhost/vhost_user.c
> >>>> @@ -24,9 +24,13 @@
> >>>> #include <stdlib.h>
> >>>> #include <string.h>
> >>>> #include <unistd.h>
> >>>> +#include <fcntl.h>
> >>>> +#include <linux/userfaultfd.h>
> >>>
> >>> Maybe we need compile time check for this header existence?
> >>> Otherwise, this will bump minimal kernel version for default linux build
> >>> to something like 4.3.
> >>
> >> We'll need a config option here (disabled by default) and guard all
> >> the postcopy related code.
> >> Meson build will be able to detect the header file and enable
> >> the config if possible. Like this:
> >>
> >> lib/librte_vhost/meson.build:
> >> if cc.has_header('linux/userfaultfd.h')
> >> dpdk_conf.set10('RTE_LIBRTE_VHOST_POSTCOPY', true)
> >
> > Are you sure you want 'set10' rather than 'set'. Set is probably easier
> > because it ensures no define on false, while set10 has a define of 0. This
> > has caught me out before.
> >
> > FYI, you can also avoid the if by putting the condition into the define:
> >
> > dpdk_conf.set('RTE_LIBRTE_VHOST_POSTCOPY', cc.has_header('...'))
>
> Sure, this variant looks better. Thanks for suggestions.
> I just copied my version from the similar code for 'RTE_HAS_LIBNUMA'.
>
Yes, looking at that code, it could do with a clean-up to shorten it too.
[It's true that nothing embarasses a programmer more than their own code 6
months layer :-)]
/Bruce
next prev parent reply other threads:[~2018-09-28 13:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-26 7:26 [dpdk-dev] [PATCH 00/12] vhost: add postcopy live-migration support Maxime Coquelin
2018-09-26 7:26 ` [dpdk-dev] [PATCH 01/12] vhost: define postcopy protocol flag Maxime Coquelin
2018-09-26 7:26 ` [dpdk-dev] [PATCH 02/12] vhost: add number of fds to vhost-user messages and use it Maxime Coquelin
2018-09-26 7:26 ` [dpdk-dev] [PATCH 03/12] vhost: enable fds passing when sending vhost-user messages Maxime Coquelin
2018-09-26 7:26 ` [dpdk-dev] [PATCH 04/12] vhost: introduce postcopy's advise message Maxime Coquelin
2018-09-26 15:22 ` Alejandro Lucero
2018-09-27 9:35 ` Maxime Coquelin
[not found] ` <CGME20180927082608eucas1p17cd1d99e54134fb2a6de3151e52048f3@eucas1p1.samsung.com>
2018-09-27 8:28 ` [dpdk-dev] [04/12] " Ilya Maximets
2018-09-28 10:40 ` Ilya Maximets
2018-09-28 12:13 ` Bruce Richardson
2018-09-28 13:17 ` Ilya Maximets
2018-09-28 13:24 ` Bruce Richardson [this message]
2018-09-28 13:49 ` Maxime Coquelin
2018-09-26 7:26 ` [dpdk-dev] [PATCH 05/12] vhost: add support for postcopy's listen message Maxime Coquelin
2018-09-26 7:26 ` [dpdk-dev] [PATCH 06/12] vhost: register new regions with userfaultfd Maxime Coquelin
2018-09-26 15:31 ` Alejandro Lucero
2018-09-27 9:37 ` Maxime Coquelin
2018-09-26 7:27 ` [dpdk-dev] [PATCH 07/12] vhost: avoid useless VhostUserMemory copy Maxime Coquelin
2018-09-26 7:27 ` [dpdk-dev] [PATCH 08/12] vhost: send userfault range addresses back to qemu Maxime Coquelin
2018-09-26 7:27 ` [dpdk-dev] [PATCH 09/12] vhost: add support to postcopy's end request Maxime Coquelin
2018-09-26 7:27 ` [dpdk-dev] [PATCH 10/12] vhost: enable postcopy protocol feature Maxime Coquelin
2018-09-26 7:27 ` [dpdk-dev] [PATCH 11/12] vhost: add flag to enable postcopy live-migration Maxime Coquelin
2018-09-26 7:27 ` [dpdk-dev] [PATCH 12/12] net/vhost: add parameter to enable postcopy migration support Maxime Coquelin
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