1 files changed, 13 insertions, 6 deletions
diff --git a/gnu/build/vm.scm b/gnu/build/vm.scm
index b85398ed24..6f920aec9e 100644
--- a/gnu/build/vm.scm
+++ b/gnu/build/vm.scm
@@ -82,6 +82,7 @@
                            make-disk-image?
                            single-file-output?
                            target-arm32?
+                           target-aarch64?
                            (disk-image-size (* 100 (expt 2 20)))
                            (disk-image-format "qcow2")
                            (references-graphs '()))
@@ -97,10 +98,14 @@ access it via /dev/hda.
 REFERENCES-GRAPHS can specify a list of reference-graph files as produced by
 the #:references-graphs parameter of 'derivation'."
 
+  (define target-arm? (or target-arm32? target-aarch64?))
+
   (define arch-specific-flags
     `(;; On ARM, a machine has to be specified. Use "virt" machine to avoid
       ;; hardware limits imposed by other machines.
-      ,@(if target-arm32? '("-M" "virt") '())
+      ,@(if target-arm?
+            '("-M" "virt")
+            '())
 
       ;; On ARM32, if the kernel is built without LPAE support, ECAM conflicts
       ;; with VIRT_PCIE_MMIO causing PCI devices not to show up.  Disable
@@ -112,9 +117,9 @@ the #:references-graphs parameter of 'derivation'."
 
       ;; Only enable kvm if we see /dev/kvm exists.  This allows users without
       ;; hardware virtualization to still use these commands.  KVM support is
-      ;; still buggy on some ARM32 boards. Do not use it even if available.
+      ;; still buggy on some ARM boards. Do not use it even if available.
       ,@(if (and (file-exists? "/dev/kvm")
-                 (not target-arm32?))
+                 (not target-arm?))
             '("-enable-kvm")
             '())
 
@@ -125,11 +130,11 @@ the #:references-graphs parameter of 'derivation'."
                       ;; The serial port name differs between emulated
                       ;; architectures/machines.
                       " console="
-                      (if target-arm32? "ttyAMA0" "ttyS0"))
+                      (if target-arm? "ttyAMA0" "ttyS0"))
 
       ;; NIC is not supported on ARM "virt" machine, so use a user mode
       ;; network stack instead.
-      ,@(if target-arm32?
+      ,@(if target-arm?
             '("-device" "virtio-net-pci,netdev=mynet"
               "-netdev" "user,id=mynet")
             '("-net" "nic,model=virtio"))))
@@ -153,7 +158,9 @@ the #:references-graphs parameter of 'derivation'."
     (_ #f))
 
   (apply invoke qemu "-nographic" "-no-reboot"
-         "-smp" (number->string (parallel-job-count))
+         ;; CPU "max" behaves as "host" when KVM is enabled, and like a system
+         ;; CPU with the maximum possible feature set otherwise.
+         "-cpu" "max"
          "-m" (number->string memory-size)
          "-object" "rng-random,filename=/dev/urandom,id=guixsd-vm-rng"
          "-device" "virtio-rng-pci,rng=guixsd-vm-rng"