Anthony Liguori wrote:
Sukanto Ghosh wrote:
ii) Who does the allocation of host physical memory to the guest,
is it KVM module or the associated QEmu process ?
The QEMU process allocates the memory via malloc().
Doesn't the QEMU process and the guest have different address-spaces
? So, how can it malloc for the guest ? I thought the QEMU process
requests for the memory allocation to the kvm module via the /dev/kvm
device node.
Yes, the guest has a different address space from the host. The QEMU
process malloc()'s the physical memory for the guest, and tells KVM
what the region is (via an ioctl to /dev/kvm).
Why does the QEMU process needs to malloc() the physical memory for the
guest ? Why can't it be done by the kernel itself ? Is it because the
said pages will be sharable between the QEMU process and the guest,
which will aid the QEMU process while performing DMA.
Also, when and how are host-initiated virtual interrupts delivered? I
guess, that it is done at the time of VM-entry. But what about the
interrupts that need to be delivered immediately and while the VM is
executing (assume interrupts are enabled in the guest). Is any kind of
signal-based mechanism employed to force a VM-exit ?
Thanks and Regards,
Sukanto Ghosh
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