[libvirt] [PATCH] qemu: Format gic-version=2 on the command line

Up until now we have only formatted non-default GIC versions on the command line, in order to maintain compatibility with older QEMU versions that didn't implement the gic-version option to begin with; however, doing so is entirely unnecessary for newer QEMU versions, where the option is available. Moreover, having the GIC version formatted on the command line at all times ensures that QEMU changing its own defaults doesn't affect the ABI of libvirt guests. A few test cases are removed to avoid extra churn. It doesn't matter for coverage, as those scenarios are already covered by other parts of the test suite. This patch is better viewed with 'git show -w'. Signed-off-by: Andrea Bolognani <abologna(a)redhat.com&gt; --- src/qemu/qemu_command.c | 44 +++++++++++++++++------- tests/qemuxml2argvdata/aarch64-gic-none-tcg.args | 2 +- tests/qemuxml2argvdata/aarch64-gic-v2.args | 2 +- tests/qemuxml2argvtest.c | 6 ---- 4 files changed, 33 insertions(+), 21 deletions(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 682d714419..1ab1e1a285 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -7299,21 +7299,39 @@ qemuBuildMachineCommandLine(virCommandPtr cmd, goto cleanup; if (def->features[VIR_DOMAIN_FEATURE_GIC] == VIR_TRISTATE_SWITCH_ON) { - if (def->gic_version != VIR_GIC_VERSION_NONE) { - /* The default GIC version (GICv2) should not be specified on - * the QEMU commandline for backwards compatibility reasons */ - if (def->gic_version != VIR_GIC_VERSION_2) { - if (!virQEMUCapsGet(qemuCaps, - QEMU_CAPS_MACH_VIRT_GIC_VERSION)) { - virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", - _("gic-version option is not available " - "with this QEMU binary")); - goto cleanup; - } + bool hasGICVersionOption = virQEMUCapsGet(qemuCaps, + QEMU_CAPS_MACH_VIRT_GIC_VERSION); + + switch ((virGICVersion) def->gic_version) { + case VIR_GIC_VERSION_2: + if (!hasGICVersionOption) { + /* If the gic-version option is not available, we can't + * configure the GIC; however, we know that before the + * option was introduced the guests would always get a + * GICv2, so in order to maintain compatibility with + * those old QEMU versions all we need to do is stop + * early instead of erroring out */ + break; + } + ATTRIBUTE_FALLTHROUGH; - virBufferAsprintf(&buf, ",gic-version=%s", - virGICVersionTypeToString(def->gic_version)); + case VIR_GIC_VERSION_3: + case VIR_GIC_VERSION_HOST: + if (!hasGICVersionOption) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("gic-version option is not available " + "with this QEMU binary")); + goto cleanup; } + + virBufferAsprintf(&buf, ",gic-version=%s", + virGICVersionTypeToString(def->gic_version)); + break; + + case VIR_GIC_VERSION_NONE: + case VIR_GIC_VERSION_LAST: + default: + break; } } diff --git a/tests/qemuxml2argvdata/aarch64-gic-none-tcg.args b/tests/qemuxml2argvdata/aarch64-gic-none-tcg.args index 4e3c0eee2d..b766a821d5 100644 --- a/tests/qemuxml2argvdata/aarch64-gic-none-tcg.args +++ b/tests/qemuxml2argvdata/aarch64-gic-none-tcg.args @@ -7,7 +7,7 @@ QEMU_AUDIO_DRV=none \ /usr/bin/qemu-system-aarch64 \ -name guest \ -S \ --machine virt,accel=tcg \ +-machine virt,accel=tcg,gic-version=2 \ -cpu cortex-a57 \ -m 1024 \ -smp 1,sockets=1,cores=1,threads=1 \ diff --git a/tests/qemuxml2argvdata/aarch64-gic-v2.args b/tests/qemuxml2argvdata/aarch64-gic-v2.args index 7e88bbde3f..eec5c4a082 100644 --- a/tests/qemuxml2argvdata/aarch64-gic-v2.args +++ b/tests/qemuxml2argvdata/aarch64-gic-v2.args @@ -7,7 +7,7 @@ QEMU_AUDIO_DRV=none \ /usr/bin/qemu-system-aarch64 \ -name aarch64test \ -S \ --machine virt,accel=kvm \ +-machine virt,accel=kvm,gic-version=2 \ -cpu host \ -m 1024 \ -smp 1,sockets=1,cores=1,threads=1 \ diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c index 308d71f725..dee765d3dd 100644 --- a/tests/qemuxml2argvtest.c +++ b/tests/qemuxml2argvtest.c @@ -2608,8 +2608,6 @@ mymain(void) DO_TEST("aarch64-cpu-passthrough", QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_DEVICE_VIRTIO_MMIO, QEMU_CAPS_KVM); - DO_TEST_GIC("aarch64-gic-none", GIC_NONE, - QEMU_CAPS_KVM, QEMU_CAPS_MACHINE_OPT); DO_TEST_GIC("aarch64-gic-none", GIC_NONE, QEMU_CAPS_KVM, QEMU_CAPS_MACHINE_OPT, QEMU_CAPS_MACH_VIRT_GIC_VERSION); @@ -2625,8 +2623,6 @@ mymain(void) DO_TEST_GIC("aarch64-gic-none-tcg", GIC_BOTH, QEMU_CAPS_MACHINE_OPT, QEMU_CAPS_MACH_VIRT_GIC_VERSION); - DO_TEST_GIC("aarch64-gic-default", GIC_NONE, - QEMU_CAPS_KVM, QEMU_CAPS_MACHINE_OPT); DO_TEST_GIC("aarch64-gic-default", GIC_NONE, QEMU_CAPS_KVM, QEMU_CAPS_MACHINE_OPT, QEMU_CAPS_MACH_VIRT_GIC_VERSION); @@ -2639,8 +2635,6 @@ mymain(void) DO_TEST_GIC("aarch64-gic-default-both", GIC_BOTH, QEMU_CAPS_KVM, QEMU_CAPS_MACHINE_OPT, QEMU_CAPS_MACH_VIRT_GIC_VERSION); - DO_TEST_GIC("aarch64-gic-v2", GIC_NONE, - QEMU_CAPS_KVM, QEMU_CAPS_MACHINE_OPT); DO_TEST_GIC("aarch64-gic-v2", GIC_NONE, QEMU_CAPS_KVM, QEMU_CAPS_MACHINE_OPT, QEMU_CAPS_MACH_VIRT_GIC_VERSION); -- 2.14.3