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Re: [libvirt] [PATCH v3 4/4] Build QEMU command line for pcihole64



On 08/27/2013 03:39 PM, Daniel P. Berrange wrote:
> On Thu, Aug 15, 2013 at 01:30:21PM +0200, Ján Tomko wrote:
>> QEMU commit 3984890 introduced the "pci-hole64-size" property,
>> to i440FX-pcihost and q35-pcihost with a default setting of 2 GB.
>>
>> Translate <pcihole64>x<pcihole64/> to:
>> -global q35-pcihost.pci-hole64-size=x for q35 machines and
>> -global i440FX-pcihost.pci-hole64-size=x for i440FX-based machines.
>>
>> Error out on other machine types or if the size was specified
>> but the pcihost device lacks 'pci-hole64-size' property.
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=990418
>> ---
>>  src/qemu/qemu_capabilities.c                       | 14 ++++++
>>  src/qemu/qemu_capabilities.h                       |  2 +
>>  src/qemu/qemu_command.c                            | 58 ++++++++++++++++++++++
>>  .../qemuxml2argv-pcihole64-none.args               |  4 ++
>>  .../qemuxml2argv-pcihole64-q35.args                |  9 ++++
>>  tests/qemuxml2argvdata/qemuxml2argv-pcihole64.args |  5 ++
>>  tests/qemuxml2argvtest.c                           | 10 ++++
>>  7 files changed, 102 insertions(+)
>>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pcihole64-none.args
>>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pcihole64-q35.args
>>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pcihole64.args
> 
> 
>> +    for (i = 0; i < def->ncontrollers; i++) {
>> +        virDomainControllerDefPtr cont = def->controllers[i];
>> +        if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_PCI &&
>> +            cont->opts.pciopts.pcihole64) {
> 
> Hmm, by doing  'if (cont->opts.pciopts.pcihole64)' we loose the ability
> to set  pcihole64=0, to completely disable the PCI hole. Is this something
> we need to worry about ? If so, then we'll need a way to distinguish  a
> hole value of 0, from the "no attribute set" scenario.
> 

pciopts.pcihole64 is a bool meaning "the attribute is set", the size is stored
in pciopts.pcihole64size.

Jan


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