TODO

The following items need some love. Please post to the list if you are interested in helping out:

Real mode support: VT support for real mode is terrible, so we need to do it in software. This means extending the x86 emulator (x86_emulate.c) to handle more instructions, and changing the execution loop to call the emulator for real mode.
Move the apic/ioapic/pic/pit emulation into the kernel. This will simplify in-kernel paravirtualized devices (as there is no need to exit to userspace to inject an interrupt) and guest SMP. Some bitrotted code already exists.
Drop the preemption counter while doing mmu stuff, and turn kvm->lock into a mutex.
Fedora kernel package: packaging kernel modules is a rather arcane stuff. We already have volunteers for openSUSE and Debian; we need packages for Fedora.

The following smaller scale tasks can be a nice entry point to someone wishing to get involved:

Enforce the virtual time stamp counter monotonicity even when a vcpu is migrated to another physical cpu. (in progress, Leonard Norrgård)
Avoid saving/loading the floating point unit state on each vm entry/exit (Anthony Liguori has partially working code).
Trap #UD and emulate sysenter/syscall/sysret/sysexit. These instructions don't exist on all cpus in all modes, so they hinder cross-vendor migration
Consolidate the various functions that read and write guest memory. There is some duplication there.
Consolidate the inb/outb emulation helpers into x86_emulate.c

MMU related:

Attach kvm memory to a Linux address_space so that guest memory can be paged out.
Support large pages (in conjunction with the item above) so that if the guest uses a large page mapping and the guest memory is backed by hugetlbfs, a large-page pte is created.
Improve mmu page eviction algorithm (currently FIFO, change to approximate LRU).
Implement kvm_mmu_post_write() so that page table updates don't take an immediate page fault after the write.
Add a read-only memory type. This can be used to speed up APIC reads, which is fairly important for Windows guests.

For the adventurous:

Emulate the VT and SVM instructions, so that kvm can run in a virtual machine. Test by running a VM in a VT guest in an SVM guest on VT hardware, as well as running a VM in an SVM guest in a VT guest on SVM hardware.