Re: [libvirt] [RFC v3 PATCH 4/5] PowerPC : Clean up qemuBuildCommandLine to remove x86-specific assumptions from generic code.

From: Prerna Saxena <prerna(a)linux.vnet.ibm.com&gt; Date: Mon, 21 Nov 2011 18:20:42 +0530 Subject: [PATCH 4/5] Clean up qemuBuildCommandLine to remove x86-specific assumptions from generic code. This implements the minimal set of changes needed in libvirt to launch a PowerPC-KVM based guest. It removes x86-specific assumptions about choice of serial driver backend from generic qemu guest commandline generation code. It also restricts the ACPI capability to be available for an x86 or x86_64 domain. This is not a complete solution -- it still does not guarantee libvirt the capability to flag non-supported options in guest XML. (Eg, an ACPI specification in a PowerPC guest XML will still get processed, even though qemu-system-ppc64 does not support it while qemu-system-x86_64 does.) This drawback exists because libvirt falls back on qemu to query supported features, and qemu '-h' blindly lists all capabilities -- irrespective of whether they are available while emulating a given architecture or not. The long-term solution would be for qemu to list out capabilities based on architecture and platform -- so that libvirt can cleanly make out what devices are supported on an arch (say 'ppc64') and platform (say, 'mac99'). Signed-off-by: Prerna Saxena <prerna(a)linux.vnet.ibm.com&gt; --- src/qemu/qemu_command.c | 39 ++++++++++++++++++++++++++++++++++++--- src/qemu/qemu_command.h | 6 ++++++ 2 files changed, 42 insertions(+), 3 deletions(-)

/* * This method takes a string representing a QEMU command line ARGV set @@ -6649,7 +6680,9 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps, def->maxvcpus = 1; def->vcpus = 1; def->clock.offset = VIR_DOMAIN_CLOCK_OFFSET_UTC; - def->features = (1 << VIR_DOMAIN_FEATURE_ACPI) + + if (STREQ(def->os.arch, "i686")||STREQ(def->os.arch, "x86_64")) + def->features = (1 << VIR_DOMAIN_FEATURE_ACPI) /*| (1 << VIR_DOMAIN_FEATURE_APIC)*/; def->onReboot = VIR_DOMAIN_LIFECYCLE_RESTART; def->onCrash = VIR_DOMAIN_LIFECYCLE_DESTROY;