linux-stable.git/include/linux/kvm_host.h, branch linux-2.6.34.y

KVM: unmap pages from the iommu when slots are removed

2014-02-10T21:10:42+00:00

commit 32f6daad4651a748a58a3ab6da0611862175722f upstream.

We've been adding new mappings, but not destroying old mappings.
This can lead to a page leak as pages are pinned using
get_user_pages, but only unpinned with put_page if they still
exist in the memslots list on vm shutdown.  A memslot that is
destroyed while an iommu domain is enabled for the guest will
therefore result in an elevated page reference count that is
never cleared.

Additionally, without this fix, the iommu is only programmed
with the first translation for a gpa.  This can result in
peer-to-peer errors if a mapping is destroyed and replaced by a
new mapping at the same gpa as the iommu will still be pointing
to the original, pinned memory address.

Signed-off-by: Alex Williamson 
Signed-off-by: Marcelo Tosatti 
[PG: minor tweak since 2.6.34 doesnt have kvm_for_each_memslot]
Signed-off-by: Paul Gortmaker

KVM: Ensure all vcpus are consistent with in-kernel irqchip settings

2012-08-17T19:35:04+00:00

commit 3e515705a1f46beb1c942bb8043c16f8ac7b1e9e upstream.

If some vcpus are created before KVM_CREATE_IRQCHIP, then
irqchip_in_kernel() and vcpu->arch.apic will be inconsistent, leading
to potential NULL pointer dereferences.

Fix by:
- ensuring that no vcpus are installed when KVM_CREATE_IRQCHIP is called
- ensuring that a vcpu has an apic if it is installed after KVM_CREATE_IRQCHIP

This is somewhat long winded because vcpu->arch.apic is created without
kvm->lock held.

Based on earlier patch by Michael Ellerman.

Signed-off-by: Michael Ellerman 
Signed-off-by: Avi Kivity 
[PG: in .34 label "unlock_vcpu_destroy" is just "vcpu_destroy"]
Signed-off-by: Paul Gortmaker

KVM: Increase NR_IOBUS_DEVS limit to 200

2010-04-20T10:08:30+00:00

This patch increases the current hardcoded limit of NR_IOBUS_DEVS
from 6 to 200. We are hitting this limit when creating a guest with more
than 1 virtio-net device using vhost-net backend. Each virtio-net
device requires 2 such devices to service notifications from rx/tx queues.

Signed-off-by: Sridhar Samudrala 
Signed-off-by: Avi Kivity

KVM: fix the handling of dirty bitmaps to avoid overflows

2010-04-20T10:06:55+00:00

Int is not long enough to store the size of a dirty bitmap.

This patch fixes this problem with the introduction of a wrapper
function to calculate the sizes of dirty bitmaps.

Note: in mark_page_dirty(), we have to consider the fact that
  __set_bit() takes the offset as int, not long.

Signed-off-by: Takuya Yoshikawa 
Signed-off-by: Marcelo Tosatti

KVM: Convert kvm->requests_lock to raw_spinlock_t

2010-03-01T15:36:13+00:00

The code relies on kvm->requests_lock inhibiting preemption.

Noted by Jan Kiszka.

Signed-off-by: Avi Kivity

KVM: Introduce kvm_host_page_size

2010-03-01T15:36:08+00:00

This patch introduces a generic function to find out the
host page size for a given gfn. This function is needed by
the kvm iommu code. This patch also simplifies the x86
host_mapping_level function.

Signed-off-by: Joerg Roedel 
Signed-off-by: Avi Kivity

KVM: enable PCI multiple-segments for pass-through device

2010-03-01T15:36:06+00:00

Enable optional parameter (default 0) - PCI segment (or domain) besides
BDF, when assigning PCI device to guest.

Signed-off-by: Zhai Edwin 
Acked-by: Chris Wright 
Signed-off-by: Marcelo Tosatti

KVM: Lazify fpu activation and deactivation

2010-03-01T15:35:50+00:00

Defer fpu deactivation as much as possible - if the guest fpu is loaded, keep
it loaded until the next heavyweight exit (where we are forced to unload it).
This reduces unnecessary exits.

We also defer fpu activation on clts; while clts signals the intent to use the
fpu, we can't be sure the guest will actually use it.

Signed-off-by: Avi Kivity

KVM: convert slots_lock to a mutex

2010-03-01T15:35:45+00:00

Signed-off-by: Marcelo Tosatti

KVM: switch vcpu context to use SRCU

2010-03-01T15:35:45+00:00

Signed-off-by: Marcelo Tosatti