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# Date Author Comment
b827df58 05/08/2009 11:42 pm Avi Kivity

kvm: Add support for querying supported cpu features

kvm does not support all cpu features; add support for dunamically querying
the supported feature set.

Signed-off-by: Avi Kivity <>
Signed-off-by: Anthony Liguori <>
ad7b8b33 05/08/2009 11:42 pm Anthony Liguori

Introduce kvm_check_extension to check if KVM extensions are supported

Signed-off-by: Anthony Liguori <>
6f0437e8 05/01/2009 05:44 pm Jan Kiszka

kvm: Avoid COW if KVM MMU is asynchronous

Avi Kivity wrote:

Suggest wrapping in a function and hiding it deep inside kvm-all.c.

Done in v2:

---------->

If the KVM MMU is asynchronous (kernel does not support MMU_NOTIFIER),
we have to avoid COW for the guest memory. Otherwise we risk serious...
d3f8d37f 04/17/2009 05:26 pm aliguori

kvm: Add sanity checks to slot management (Jan Kiszka)

Fail loudly if we run out of memory slot.

Make sure that dirty log start/stop works with consistent memory regions
by reporting invalid parameters. This reveals several inconsistencies in
the vga code, patch to fix them follows later in this series....
e22a25c9 03/12/2009 10:12 pm aliguori

Guest debugging support for KVM (Jan Kiszka)

This is a backport of the guest debugging support for the KVM
accelerator that is now part of the KVM tree. It implements the reworked
KVM kernel API for guest debugging (KVM_CAP_SET_GUEST_DEBUG) which is
not yet part of any mainline kernel but will probably be 2.6.30 stuff....
f5d6f51b 12/16/2008 12:20 am aliguori

kvm: sync vcpu state during initialization (Hollis Blanchard)

Currently on x86, qemu initializes CPUState but KVM ignores it and does its
own vcpu initialization. However, PowerPC KVM needs to be able to set the
initial register state to support the -kernel and -append options....
f65ed4c1 12/09/2008 10:09 pm aliguori

KVM: Coalesced MMIO support

MMIO exits are more expensive in KVM or Xen than in QEMU because they
involve, at least, privilege transitions. However, MMIO write
operations can be effectively batched if those writes do not have side
effects.

Good examples of this include VGA pixel operations when in a planar...
bd322087 12/04/2008 10:33 pm aliguori

Add virtio-balloon support

This adds a VirtIO based balloon driver. It uses madvise() to actually balloon
the memory when possible.

Until 2.6.27, KVM forced memory pinning so we must disable ballooning unless the
kernel actually supports it when using KVM. It's always safe when using TCG....
5832d1f2 11/24/2008 09:36 pm aliguori

kvm: Introduce kvm logging interface (Glauber Costa)

Introduce functions to control logging of memory regions.
We select regions based on its start address, a
guest_physical_addr (target_phys_addr_t, in qemu nomenclature).

The main user of this interface right now is VGA optimization...
984b5181 11/13/2008 09:21 pm aliguori

Define kvm_ioctl in the same way as ioctl

The third argument to ioctl is a ... which allows any value to be passed. In
practice, glibc always treats the argument as a void *.

Do the same thing for the kvm ioctls to keep things consistent with a
traditional ioctl....
05330448 11/05/2008 06:29 pm aliguori

Add missing files to KVM commit.

Signed-off-by: Anthony Liguori <>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5629 c046a42c-6fe2-441c-8c8c-71466251a162