zhunxun@xxxxxxxxx
发件人： zhunxun@xxxxxxxxx发送时间： 2016-10-23 17:42收件人： berrange主题： Re: Re: How libvirt address qemu command line argsThanks，However,I have to use this method.Now I wander how get the VM xml contents in Libvirt source code,I try output some message in qemuProcessStart function like this ,but I get nothing,anyone can help me??thanks!my code is :in qemuStartProcess functionchar *str=qemuDomainDefFormatXML(driver, vm->def, 0);
FILE *op=fopen("/root/libvirt.log","a");
if(op!=NULL){
if(str!=NULL)
fprintf(op,"str----cmd : %s\n",str);
else
fprintf(op,"str is null\n");
fclose(op);
}else{
fprintf(op,"open file error!\n");
}
zhunxun@xxxxxxxxxFrom: Daniel P. BerrangeDate: 2016-10-19 15:35To: Michal PrivoznikSubject: Re: How libvirt address qemu command line argsOn Wed, Oct 19, 2016 at 10:17:21AM +0800, Michal Privoznik wrote:> On 18.10.2016 14:59, zhunxun@xxxxxxxxx wrote:> > Now I want to add some args about TPM to domain's XML,so I can start a domain by virt-manager or other virsh command,and then ,I would like to use sVIrt security context to label vTPM and correspondingVM,But I do not know how to get these XML args in libvirt.> > the key problem is that how can i get and recognize these args!!!> > related XML content :>> Usually, grepping the code for cmd name <-> XML element/attribute> translation is sufficient (esp. if you grep tests/)>> >> > <qemu:commandline>> > <qemu:arg value='-enable-kvm'/>>> Firstly, this is obsolete in favour of "-machine accel=kvm". In any> case, <domain type='kvm'/> will do the trick (libvirt will use whatever> is supported by qemu binary in your system).>> > <qemu:arg value='-drive'/>> > <qemu:arg value='file=/root/nvram_2.0-jin.qcow2,if=none,id=nvram0-0-0,format=qcow2'/>>> Okay, this is not supported by libvirt yet. We don't really have a way> how to specify NVRAM in anything other than a raw file. BTW: isn't qcow> too big gun for NVRAM? I mean, NVRAM has a fixed size of what ~190 KB?> QCOW header is about the same size.>> > <qemu:arg value='-device'/>> > <qemu:arg value='tpm-tis,tpmdev=tpm-tpm0,id=tpm0'/>> > <qemu:arg value='-tpmdev'/>> > <qemu:arg value='libtpms,id=tpm-tpm0,nvram=nvram0-0-0,startup=clear'/>>> I'm not sure there's a way how to put startup=clean on the cmd line. I'm> not even sure what it does.> And I have not idea what libtpms is either :-)>> > <qemu:arg value='-bios'/>> > <qemu:arg value='/root/xenSeabios/out/bios.bin'/>> > </qemu:commandline>> >On top of all that - QEMU is likely to fail to start since libvirt bydefault runs it as qemu:qemu user/group, and so it won't have permissionto read any of the files in /root. If you have selinux/apparmour thatwill also block permission.This is an example of why usage of qemu:commandline is discouraged - itwill always have problems with permissions if you pass files using it.Regards,Daniel--|: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :||: http://libvirt.org -o- http://virt-manager.org :||: http://entangle-photo.org -o- http://search.cpan.org/~danberr/ :|
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