Please find my responses & questions in line. Thx, Venkat -----Original Message----- From: Avi Kivity [mailto:avi@xxxxxxxxxx] Sent: Wednesday, May 06, 2009 4:42 PM To: Kumar, Venkat Cc: kvm@xxxxxxxxxxxxxxx Subject: Re: Allocating Extra Memory To Guest Kumar, Venkat wrote: > Hi, > > 1. How should we allocate extra memory to guest other than memory allocated through "qemu_alloc_physram"?? > qemu_alloc_physram() is obsolete. I've just removed it to avoid confusion (and a warning). ==> If kvm-85 is the latest version, I still see "qemu_alloc_physram" invoked to allocate memory. This piece of code is in qemu/vl.c. =================================================================== phys_ram_base = qemu_alloc_physram(phys_ram_size); if (!phys_ram_base) { fprintf(stderr, "Could not allocate physical memory\n"); exit(1); } ==================================================================== I presume you want to give kvm memory which is not real RAM - from a host device? hw/device-assignment.c does that. Please clarify what you want to do. ==> I want to allocate extra RAM for the guest apart from memory allocated through "qemu_alloc_physram". Let's assume that I have allocated some RAM for guest through "qemu_alloc_physram" call and some more memory through "malloc or mmap", how will I register these two virtually discontinuous memory regions with KVM? > 2. How to register the extra allocated memory with KVM? > cpu_register_physical_memory(), but that has to come from qemu_ram_alloc(). As a hack, you can call qemu_ram_alloc(), and then mmap(qemu_ram_ptr(ram_offset), ... ) to replace the RAM with device memory. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
