From: Anthony PERARD <anthony.perard@citrix.com>
To: Wei Liu <wei.liu2@citrix.com>
Cc: Xen-devel <xen-devel@lists.xenproject.org>,
Stefano Stabellini <sstabellini@kernel.org>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
Jan Beulich <JBeulich@suse.com>
Subject: Re: [PATCH 3/3] libxl: update vcpus bitmap in retrieved guest config
Date: Tue, 7 Jun 2016 15:45:29 +0100 [thread overview]
Message-ID: <20160607144529.GL1184@perard.uk.xensource.com> (raw)
In-Reply-To: <1465298642-5356-4-git-send-email-wei.liu2@citrix.com>
On Tue, Jun 07, 2016 at 12:24:02PM +0100, Wei Liu wrote:
> ... because the available vcpu bitmap can change during domain life time
> due to cpu hotplug and unplug.
>
> For QEMU upstream, we interrogate QEMU for the number of vcpus. For
> others, we look directly into xenstore for information.
>
> Reported-by: Jan Beulich <jbeulich@suse.com>
> Signed-off-by: Wei Liu <wei.liu2@citrix.com>
> ---
> tools/libxl/libxl.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 91 insertions(+)
>
> diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
> index 006b83f..4f8b663 100644
> --- a/tools/libxl/libxl.c
> +++ b/tools/libxl/libxl.c
> @@ -7222,6 +7222,57 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, libxl_mac *src)
> (*dst)[i] = (*src)[i];
> }
>
> +static int libxl__update_avail_vcpus_qmp(libxl__gc *gc, uint32_t domid,
> + unsigned int max_vcpus,
> + libxl_bitmap *map)
> +{
> + unsigned int count, i;
> + int rc;
> +
> + /* For QEMU upstream we always need to return the number
> + * of cpus present to QEMU whether they are online or not;
> + * otherwise QEMU won't accept the saved state.
> + */
> + rc = libxl__qmp_query_cpus(gc, domid, &count);
> + if (rc) {
> + LOG(ERROR, "fail to get number of cpus for domain %d", domid);
> + goto out;
> + }
> +
> + for (i = 0; i < count; i++)
> + libxl_bitmap_set(map, i);
What if I have cpu 1, 7 and 42 online, but all the other offline?
--
Anthony PERARD
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next prev parent reply other threads:[~2016-06-07 14:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 11:23 [PATCH 0/3] libxl: update available vcpus map in retrieve configuration function Wei Liu
2016-06-07 11:24 ` [PATCH 1/3] libxl: introduce libxl__json_array_count Wei Liu
2016-06-07 11:24 ` [PATCH 2/3] libxl: introduce libxl__qmp_query_cpus Wei Liu
2016-06-07 11:24 ` [PATCH 3/3] libxl: update vcpus bitmap in retrieved guest config Wei Liu
2016-06-07 14:45 ` Anthony PERARD [this message]
2016-06-07 16:03 ` Wei Liu
2016-06-07 16:22 ` Dario Faggioli
2016-06-07 16:46 ` Wei Liu
2016-06-07 17:05 ` Dario Faggioli
2016-06-07 16:36 ` Anthony PERARD
2016-06-07 16:39 ` Wei Liu
2016-06-14 16:31 ` Ian Jackson
2016-06-14 16:39 ` Wei Liu
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