[libvirt] How does libvirt access kvm infomation?
Hi, AFAIK kvm has only an interface of qemu console when we use device hotplug, migration and so on. How does libvirt access the interface of qemu console? Best Regards, Akio Takebe
Akio Takebe wrote:
Hi,
AFAIK kvm has only an interface of qemu console when we use device hotplug, migration and so on. How does libvirt access the interface of qemu console?
As far as I understand it (from looking at the code recently), you can tell the qemu monitor to open against a pty. libvirtd does this, and holds on to the other end of the pty, and then issues commands through the PTY to do anything that you need through the monitor interface. Look at src/qemu_driver.c:qemudWaitForMonitor() (or thereabouts) for where this is setup while starting a domain. Chris Lalancette
Hi, Chris Chris Lalancette wrote:
Akio Takebe wrote:
Hi,
AFAIK kvm has only an interface of qemu console when we use device hotplug, migration and so on. How does libvirt access the interface of qemu console?
As far as I understand it (from looking at the code recently), you can tell the qemu monitor to open against a pty. libvirtd does this, and holds on to the other end of the pty, and then issues commands through the PTY to do anything that you need through the monitor interface.
Look at src/qemu_driver.c:qemudWaitForMonitor() (or thereabouts) for where this is setup while starting a domain.
Thank you for your information. I understand it. I'll ckeck around the codes. Best Regards, Akio Takebe
participants (2)
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Akio Takebe -
Chris Lalancette