@@ -36873,6 +36873,36 @@ Virtualization Services
@end table
@end deftp
+@subsubheading Xen Guest Agent
+
+@cindex xen
+@cindex xen guest agent
+
+The Xen guest agent allows a Xen host to control the emulated system.
+The @code{xe-guest-agent} service runs the agent on Guix guests.
+
+@quotation Note
+The default Linux-libre kernel that Guix ships already enables the
+necessary features for a guest. There is nothing you need to enable for
+the guest to fully support paravirtualization features.
+@end quotation
+
+@defvar xe-guest-agent-service-type
+Service type for the QEMU guest agent service.
+@end defvar
+
+@deftp {Data Type} xe-guest-agent-configuration
+Configuration for the @code{xen-guest-agent} service.
+
+@table @asis
+@item @code{package} (default: @code{xen-guest-utilities})
+The Xen guest utilities package to use.
+
+@item @code{pid-file} (default: @code{"/var/run/xe-daemon.pid"})
+Path to the file holding the PID of xe-deamon.
+@end table
+@end deftp
+
@anchor{build-vm}
@subsubheading Virtual Build Machines
@@ -33,6 +33,9 @@ (define-module (gnu services virtualization)
#:autoload (gnu packages gnupg) (guile-gcrypt)
#:use-module (gnu packages package-management)
#:use-module (gnu packages ssh)
+ #:use-module (gnu packages base)
+ #:use-module (gnu packages gawk)
+ #:use-module (gnu packages linux)
#:use-module (gnu packages virtualization)
#:use-module (gnu services base)
#:use-module (gnu services configuration)
@@ -107,7 +110,10 @@ (define-module (gnu services virtualization)
qemu-guest-agent-configuration
qemu-guest-agent-configuration?
- qemu-guest-agent-service-type))
+ qemu-guest-agent-service-type
+
+ xe-guest-agent-configuration
+ xe-guest-agent-service-type))
(define (uglify-field-name field-name)
(let ((str (symbol->string field-name)))
@@ -1004,6 +1010,77 @@ (define qemu-guest-agent-service-type
(default-value (qemu-guest-agent-configuration))
(description "Run the QEMU guest agent.")))
+
+;;;
+;;; Guest agent for VMs running under Xen
+;;;
+(define-configuration/no-serialization xe-guest-agent-configuration
+ (package
+ (package xe-guest-utilities)
+ "Xen guest management utilities package.")
+ (pid-file
+ (string "/var/run/xe-daemon.pid")
+ "Path to the file holding the PID of xe-deamon."))
+
+(define (generate-xe-guest-agent-documentation)
+ "Generate documentation for xe-guest-agent fields"
+ (generate-documentation
+ `((xe-guest-agent-configuration ,xe-guest-agent-configuration-fields))
+ 'xe-guest-agent-configuration))
+
+(define (xe-guest-agent-shepherd-service config)
+ (let ((xe-guest-utils (xe-guest-agent-configuration-package config))
+ (pid-file (xe-guest-agent-configuration-pid-file config)))
+ (list
+ (shepherd-service
+ (provision '(xe-guest-agent))
+ (requirement '(networking user-processes udev))
+ (documentation "Run the Xen guest management agent.")
+ (start
+ #~(lambda _
+ (let ((pid (make-forkexec-constructor
+ (list
+ #$(file-append xe-guest-utils
+ "/sbin/xe-daemon")
+ "-p" #$pid-file)
+ #:log-file "/var/log/xe-daemon.log"
+ #:pid-file #$pid-file
+ #:environment-variables
+ (list (string-append
+ "PATH="
+ #$(file-append xe-guest-utils "/bin") ":"
+ ;; logger
+ #$(file-append inetutils "/bin"))))))
+ ;; Run xe-linux-distribution script before starting the actual
+ ;; daemon. The script collects some basic system information that
+ ;; is shared back to the Xen host.
+ (system* #$(file-append xe-guest-utils "/sbin/xe-linux-distribution")
+ "/var/cache/xe-linux-distribution")
+ ;; Finally, start and return the PID made by
+ ;; make-forkexec-constructor.
+ pid)))
+ (stop #~(make-kill-destructor))))))
+
+(define (xe-guest-agent-udev-rules-service config)
+ (let ((guest-utils (xe-guest-agent-configuration-package config)))
+ (list
+ (file->udev-rule "z10_xen-vcpu-hotplug.rules"
+ (file-append
+ guest-utils
+ ;; I hate this z10_ prefix too
+ "/lib/udev/rules.d/z10_xen-vcpu-hotplug.rules")))))
+
+(define xe-guest-agent-service-type
+ (service-type
+ (name 'xe-guest-agent)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ xe-guest-agent-shepherd-service)
+ (service-extension udev-service-type
+ xe-guest-agent-udev-rules-service)))
+ (default-value (xe-guest-agent-configuration))
+ (description "Run the Xen guest management utilities.")))
+
;;;
;;; Secrets for guest VMs.
@@ -1860,3 +1937,102 @@ (define hurd-vm-service-type
(description
"Provide a virtual machine (VM) running GNU/Hurd, also known as a
@dfn{childhurd}.")))
+
+(define-configuration/no-serialization xe-guest-utilities-configuration
+ (xe-guest-utilities
+ (file-like xe-guest-utilities)
+ "XenServer guest utilities package.")
+ (pid-file
+ (string "/var/run/xe-daemon.pid")
+ "File holding the PID of xe-deamon."))
+
+(define (generate-xe-guest-utilities-documentation)
+ "Generate documentation for xe-guest-utilities fields"
+ (generate-documentation
+ `((xe-guest-utilities-configuration ,xe-guest-utilities-configuration-fields))
+ 'xe-guest-utilities-configuration))
+
+(define (xe-guest-utils-service config)
+ (let ((pid-file (xe-guest-utilities-configuration-pid-file config)))
+ (list
+ ;; Generate <shepherd-service>s that run the xe-daemon forever.
+ (shepherd-service
+ (documentation "Run the xe-guest-utilities daemon.")
+ (provision '(xe-guest-utilities-daemon))
+ (requirement '(xe-guest-utilities-procfs
+ xe-guest-utilities-distro))
+ (start #~(make-forkexec-constructor
+ (list #$(file-append xe-guest-utilities "/bin/xe-daemon")
+ "-p" #$pid-file)
+ #:pid-file #$pid-file
+ #:environment-variables
+ (list (string-append
+ "PATH=/run/current-system/profile/bin:"
+ "/run/current-system/profile/sbin:"
+ #$(file-append coreutils "/bin") ":"
+ #$(file-append iproute "/bin")))))
+ (stop #~(make-kill-destructor)))
+
+ ;; Generate one-shot <shepherd-service>s that informs the host hypervisor about
+ ;; the distribution of the guest (Guix in this case)
+ (shepherd-service
+ (documentation "Inform host hypervisor of guest's distribution.")
+ (provision '(xe-guest-utilities-distro))
+ (requirement '(;;xe-guest-utilities-xend
+ ))
+ (one-shot? #t)
+ (start #~(make-forkexec-constructor
+ (list #$(file-append xe-guest-utilities "/bin/xe-linux-distribution")
+ "/var/run/xe-linux-distribution")
+ #:environment-variables
+ (list (string-append
+ "PATH="
+ #$(file-append xe-guest-utilities "/bin") ":"
+ #$(file-append coreutils "/bin") ":" ;uname & co
+ #$(file-append gawk "/bin") ":"
+ #$(file-append sed "/bin")))))
+ (stop #~(make-kill-destructor)))
+
+ ;; Generate <shepherd-service>s to mount the xen directory in /proc.
+ (shepherd-service
+ (documentation "Mount /proc/xen files.")
+ (provision '(xe-guest-utilities-procfs))
+ (requirement '(file-systems))
+ (start #~(lambda ()
+ (mount "xenfs" "/proc/xen" "/proc/xen")
+ (member "/proc/xen" (mount-points))))
+ (stop #~(lambda ()
+ (umount "/proc/xen" MNT_DETACH)
+ (not (member "/proc/xen" (mount-points))))))
+
+ ;; Generate <shepherd-service>s to create the necessary temporary directories for XenStore.
+ (shepherd-service
+ (documentation "Provide a temporary directory for XenStore.")
+ (provision '(xe-guest-utilities-tmp-dir))
+ (one-shot? #t)
+ (requirement '(file-systems))
+ (start #~(lambda ()
+ (mkdir "/var/run/xenstored")
+ (chmod o755 "/var/run/xenstored")))
+ (stop #~(lambda ()
+ (delete-file-recursively "/var/run/xenstored")))))))
+
+(define (xe-guest-utils-udev-rules-service config)
+ (let ((guest-utils (xe-guest-utilities-configuration-xe-guest-utilities config)))
+ (list
+ (file->udev-rule "z10_xen-vcpu-hotplug.rules"
+ (file-append
+ guest-utils
+ ;; I hate this z10_ prefix too
+ "/etc/udev/rules.d/z10_xen-vcpu-hotplug.rules")))))
+
+(define xe-guest-utilities-service-type
+ (service-type
+ (name 'xe-guest-utilities)
+ (extensions (list (service-extension shepherd-root-service-type
+ xe-guest-utils-service)
+ (service-extension udev-service-type
+ xe-guest-utils-udev-rules-service)))
+ (default-value (xe-guest-utilities-configuration))
+ (description
+ "Enable a Guix System VM to communicate with a Xen-based hypervisor host.")))