[libvirt] [PATCH 1/3] qemu: command: Support arm 32-on-64 KVM with -cpu aarch64=off
Cole Robinson
crobinso at redhat.com
Thu May 21 23:03:26 UTC 2015
qemu 2.3.0 added the -cpu host,aarch64=off option, which allows using
qemu-system-aarch64 KVM to run armv7l VMs.
Add a capabilities check for it, wire it up in qemu_command, and test
the command line generation.
---
src/qemu/qemu_capabilities.c | 7 +++++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 13 ++++++++
.../qemuxml2argv-aarch64-kvm-32-on-64.args | 10 +++++++
.../qemuxml2argv-aarch64-kvm-32-on-64.xml | 35 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 9 ++++++
6 files changed, 75 insertions(+)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.xml
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 375df22..88c31fa 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -284,6 +284,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
"aes-key-wrap",
"dea-key-wrap",
"pci-serial",
+ "aarch64-off",
);
@@ -3270,6 +3271,12 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
if (qemuCaps->version >= 2002000)
virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_VMPORT_OPT);
+ /* -cpu ...,aarch64=off supported in v2.3.0 and onwards. But it
+ isn't detectable via qmp at this point */
+ if (qemuCaps->arch == VIR_ARCH_AARCH64 &&
+ qemuCaps->version >= 2003000)
+ virQEMUCapsSet(qemuCaps, QEMU_CAPS_CPU_AARCH64_OFF);
+
if (virQEMUCapsProbeQMPCommands(qemuCaps, mon) < 0)
goto cleanup;
if (virQEMUCapsProbeQMPEvents(qemuCaps, mon) < 0)
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 9c956f3..b5a7770 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -228,6 +228,7 @@ typedef enum {
QEMU_CAPS_AES_KEY_WRAP = 186, /* -machine aes_key_wrap */
QEMU_CAPS_DEA_KEY_WRAP = 187, /* -machine dea_key_wrap */
QEMU_CAPS_DEVICE_PCI_SERIAL = 188, /* -device pci-serial */
+ QEMU_CAPS_CPU_AARCH64_OFF = 189, /* -cpu ...,aarch64=off */
QEMU_CAPS_LAST, /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 81e89fc..376769f 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7024,6 +7024,19 @@ qemuBuildCpuModelArgStr(virQEMUDriverPtr driver,
}
virBufferAddLit(buf, "host");
+ if (def->os.arch == VIR_ARCH_ARMV7L &&
+ host->arch == VIR_ARCH_AARCH64) {
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CPU_AARCH64_OFF)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("QEMU binary does not support CPU "
+ "host-passthrough for armv7l on "
+ "aarch64 host"));
+ goto cleanup;
+ }
+
+ virBufferAddLit(buf, ",aarch64=off");
+ }
+
if (ARCH_IS_PPC64(def->os.arch) &&
cpu->mode == VIR_CPU_MODE_HOST_MODEL &&
def->cpu->model != NULL) {
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.args b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.args
new file mode 100644
index 0000000..e60e234
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.args
@@ -0,0 +1,10 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-aarch64 -S -M virt -cpu host,aarch64=off -m 1024 -smp 1 \
+-nographic -nodefconfig -nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-boot c -kernel /arm.kernel -initrd /arm.initrd \
+-append 'console=ttyAMA0,115200n8 rw root=/dev/vda rootwait physmap.enabled=0' \
+-usb -drive file=/arm.raw,if=none,id=drive-virtio-disk0 \
+-device virtio-blk-device,drive=drive-virtio-disk0,id=virtio-disk0 \
+-device virtio-net-device,vlan=0,id=net0,mac=52:54:00:09:a4:37 \
+-net user,vlan=0,name=hostnet0 -serial pty
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.xml b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.xml
new file mode 100644
index 0000000..c145b5f
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-kvm-32-on-64.xml
@@ -0,0 +1,35 @@
+<domain type="kvm">
+ <name>armtest</name>
+ <uuid>496d7ea8-9739-544b-4ebd-ef08be936e6a</uuid>
+ <memory>1048576</memory>
+ <currentMemory>1048576</currentMemory>
+ <vcpu>1</vcpu>
+ <os>
+ <type arch="armv7l" machine="virt">hvm</type>
+ <kernel>/arm.kernel</kernel>
+ <initrd>/arm.initrd</initrd>
+ <cmdline>console=ttyAMA0,115200n8 rw root=/dev/vda rootwait physmap.enabled=0</cmdline>
+ </os>
+ <features>
+ <acpi/>
+ <apic/>
+ <pae/>
+ </features>
+ <cpu mode='host-passthrough'/>
+ <clock offset="utc"/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>restart</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-aarch64</emulator>
+ <disk type='file' device='disk'>
+ <source file='/arm.raw'/>
+ <target dev='vda' bus='virtio'/>
+ </disk>
+ <interface type='user'>
+ <mac address='52:54:00:09:a4:37'/>
+ <model type='virtio'/>
+ </interface>
+ <console type='pty'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 958f786..6d26222 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1546,6 +1546,15 @@ mymain(void)
DO_TEST("aarch64-gic", QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE,
QEMU_CAPS_KVM);
+ driver.caps->host.cpu->arch = VIR_ARCH_AARCH64;
+ DO_TEST("aarch64-kvm-32-on-64", QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE,
+ QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_DEVICE_VIRTIO_MMIO,
+ QEMU_CAPS_KVM, QEMU_CAPS_CPU_HOST, QEMU_CAPS_CPU_AARCH64_OFF);
+ DO_TEST_FAILURE("aarch64-kvm-32-on-64", QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE,
+ QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_DEVICE_VIRTIO_MMIO,
+ QEMU_CAPS_KVM, QEMU_CAPS_CPU_HOST);
+ driver.caps->host.cpu->arch = cpuDefault->arch;
+
DO_TEST("kvm-pit-device", QEMU_CAPS_KVM_PIT_TICK_POLICY);
DO_TEST("kvm-pit-delay", QEMU_CAPS_NO_KVM_PIT);
DO_TEST("kvm-pit-device", QEMU_CAPS_NO_KVM_PIT,
--
2.4.1
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