Re: [libvirt PATCH v2 39/44] Deprecate QEMU_CAPS_MACHINE_OPT

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On Tue, Apr 17, 2018 at 01:16:41PM +0200, Andrea Bolognani wrote:
On Mon, 2018-04-09 at 17:20 +0200, Ján Tomko wrote:
diff --git a/tests/qemuxml2argvdata/aarch64-aavmf-virtio-mmio.args b/tests/qemuxml2argvdata/aarch64-aavmf-virtio-mmio.args
index 6f332941ce..6a25e53175 100644
--- a/tests/qemuxml2argvdata/aarch64-aavmf-virtio-mmio.args
+++ b/tests/qemuxml2argvdata/aarch64-aavmf-virtio-mmio.args
@@ -7,7 +7,7 @@ QEMU_AUDIO_DRV=none \
 /usr/bin/qemu-system-aarch64 \
 -name aarch64test \
 -S \
--M virt \
+-machine virt,accel=tcg \
 -cpu cortex-a53 \
 -m 1024 \
 -smp 1,sockets=1,cores=1,threads=1 \

[ ... etc ...]

One of the hunks you snipped looks pretty interesting:

diff --git a/tests/qemuxml2argvdata/controller-order.args b/tests/qemuxml2argvdata/controller-order.args
index 276f42fdce..7de96d5620 100644
--- a/tests/qemuxml2argvdata/controller-order.args
+++ b/tests/qemuxml2argvdata/controller-order.args
@@ -7,8 +7,7 @@ QEMU_AUDIO_DRV=spice \
 /usr/bin/qemu-system-x86_64 \
 -name fdr \
 -S \
--M rhel6.1.0 \
--enable-kvm \
+-machine rhel6.1.0,accel=kvm \
 -m 4096 \
 -smp 4,sockets=4,cores=1,threads=1 \
 -uuid d091ea82-29e6-2e34-3005-f02617b36e87 \

Unless I'm mistaken, we only use qemuBuildObsoleteAccelArg() (the
function that adds -enable-kvm) if we don't have -machine, which is
never going to be the case now, or we are asked for an accelerator
which is neither KVM or TCG, in which case we'll just error out.

As a follow-up cleanup patch, we should get rid of that function
altogether and turn the

   if (def->virtType == VIR_DOMAIN_VIRT_QEMU)
       virBufferAddLit(&buf, ",accel=tcg");
   else if (def->virtType == VIR_DOMAIN_VIRT_KVM)
       virBufferAddLit(&buf, ",accel=kvm");
   else
       obsoleteAccel = true;

from qemuBuildMachineCommandLine() into

   switch ((virDomainVirtType) def->virtType) {
   case VIR_DOMAIN_VIRT_QEMU:
       virBufferAddLit(&buf, ",accel=tcg");
       break;
   case VIR_DOMAIN_VIRT_KVM:
       virBufferAddLit(&buf, ",accel=kvm");
       break;
   default:
       virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                      _("the QEMU binary does not support %s"),
                      virDomainVirtTypeToString(def->virtType));
       goto cleanup;
   }


Right, it seems the other option for AccelArg was VIR_DOMAIN_VIRT_XEN:
commit 1f17ce215f8db809a2e5b77ef27412b7352e1451
   qemu: Remove remnants of xenner support

(One of the many commits removing xenner support)

Jano

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