From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Hao Chen <chenh@yusur.tech>, dev@dpdk.org
Cc: zy@yusur.tech, Chenbo Xia <chenbo.xia@intel.com>
Subject: Re: [PATCH v3] examples/vdpa: support running in nested virtualization environment
Date: Wed, 26 Oct 2022 08:10:14 +0200 [thread overview]
Message-ID: <9be2c87a-bbab-1187-93c9-1fc2a42cc7b9@redhat.com> (raw)
In-Reply-To: <20221025061939.3229676-1-chenh@yusur.tech>
Hi Hao
On 10/25/22 08:19, Hao Chen wrote:
> When we run dpdk vdpa in the nested virtual machine vm-L1 and ping
> test in vm-L2, the ping is NG. The reason for troubleshooting is
NG == not good? Please don't use abbreviations.
> that the virtio net in vm-L2 sends control information to the vring,
> and the qemu back-end device in vm-L1 cannot obtain correct data
> from the vring. This problem is related to the opening of the vIOMMU.
>
> This patch add option '--iommu-support' to use guest vIOMMU to
> protect vhost, then the ping test in vm-L2 is OK.
> This option is required in a nested virtualization environment.
I'm wondering whether the flag shouldn't just be set by default, as the
feature negotiation will be done between the vDPA driver & the guest
driver anyways?
> Signed-off-by: Hao Chen <chenh@yusur.tech>
> ---
> v3:
> *Modify mail title.
>
> v2:
> *fprintf all string including the eal one.
> *remove exit(1).
>
> examples/vdpa/main.c | 17 ++++++++++++-----
> 1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/examples/vdpa/main.c b/examples/vdpa/main.c
> index 4c7e81d7b6..71149461c6 100644
> --- a/examples/vdpa/main.c
> +++ b/examples/vdpa/main.c
> @@ -43,16 +43,18 @@ static char iface[MAX_PATH_LEN];
> static int devcnt;
> static int interactive;
> static int client_mode;
> +static int iommu_support;
>
> /* display usage */
> static void
> vdpa_usage(const char *prgname)
> {
> - printf("Usage: %s [EAL options] -- "
> - " --interactive|-i: run in interactive mode.\n"
> - " --iface <path>: specify the path prefix of the socket files, e.g. /tmp/vhost-user-.\n"
> - " --client: register a vhost-user socket as client mode.\n",
> - prgname);
> + const char *usage_str = " --interactive|-i: run in interactive mode.\n"
> + " --iface <path>: specify the path prefix of the socket files, e.g. /tmp/vhost-user-.\n"
> + " --client: register a vhost-user socket as client mode.\n"
> + " --iommu-support: use guest vIOMMU to protect vhost.\n";
> +
> + fprintf(stderr, "Usage: %s [EAL options] --\n%s", prgname, usage_str);
> }
>
> static int
> @@ -63,6 +65,7 @@ parse_args(int argc, char **argv)
> {"iface", required_argument, NULL, 0},
> {"interactive", no_argument, &interactive, 1},
> {"client", no_argument, &client_mode, 1},
> + {"iommu-support", no_argument, &iommu_support, 1},
> {NULL, 0, 0, 0},
> };
> int opt, idx;
> @@ -220,6 +223,10 @@ start_vdpa(struct vdpa_port *vport)
> socket_path);
> return -1;
> }
> +
> + if (iommu_support)
> + vport->flags |= RTE_VHOST_USER_IOMMU_SUPPORT;
> +
> ret = rte_vhost_driver_register(socket_path, vport->flags);
> if (ret != 0)
> rte_exit(EXIT_FAILURE,
next prev parent reply other threads:[~2022-10-26 6:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-11 2:55 [PATCH] example: vdpa: support run " Hao Chen
2022-10-17 7:23 ` Xia, Chenbo
2022-10-25 6:08 ` [PATCH v2] " Hao Chen
2022-10-25 6:19 ` [PATCH v3] examples/vdpa: support running " Hao Chen
2022-10-26 6:10 ` Maxime Coquelin [this message]
2022-10-26 6:48 ` Hao Chen
2022-11-14 3:04 ` [PATCH v4] " Hao Chen
2023-01-19 10:16 ` Maxime Coquelin
2023-02-03 14:47 ` Maxime Coquelin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9be2c87a-bbab-1187-93c9-1fc2a42cc7b9@redhat.com \
--to=maxime.coquelin@redhat.com \
--cc=chenbo.xia@intel.com \
--cc=chenh@yusur.tech \
--cc=dev@dpdk.org \
--cc=zy@yusur.tech \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).