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Re: [XEN PATCH 1/2] xen/domctl: Add highest allocated evtchn port to getdomaininfo
- To: Matthew Barnes <matthew.barnes@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 18 Apr 2024 16:59:16 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 18 Apr 2024 14:59:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.04.2024 17:24, Matthew Barnes wrote:
> --- a/xen/common/domctl.c
> +++ b/xen/common/domctl.c
> @@ -73,6 +73,7 @@ void getdomaininfo(struct domain *d, struct
> xen_domctl_getdomaininfo *info)
>
> info->domain = d->domain_id;
> info->max_vcpu_id = XEN_INVALID_MAX_VCPU_ID;
> + info->highest_evtchn_port = read_atomic(&d->valid_evtchns);
>
> /*
> * - domain is marked as blocked only if all its vcpus are blocked
> --- a/xen/include/public/domctl.h
> +++ b/xen/include/public/domctl.h
> @@ -145,7 +145,8 @@ struct xen_domctl_getdomaininfo {
> xen_domain_handle_t handle;
> uint32_t cpupool;
> uint8_t gpaddr_bits; /* Guest physical address space size. */
> - uint8_t pad2[7];
> + uint8_t pad2[3];
> + evtchn_port_t highest_evtchn_port; /* Highest allocated event channel
> port. Used for enumeration */
While, as per my reply to patch 2, I don't think this is a viable route, I'd
still like to mention that the name of the new field is wrong, leading to an
off-by-1 in the consumer in patch 2. d->valid_evtchns is a count, not the
"maximum valid" port number.
Jan
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