linux-stable.git/include/linux/kvm_host.h, branch v3.5.4

KVM: Pass kvm_irqfd to functions

2012-07-03T00:10:30+00:00

Prune this down to just the struct kvm_irqfd so we can avoid
changing function definition for every flag or field we use.

Signed-off-by: Alex Williamson 
Acked-by: Cornelia Huck 
Signed-off-by: Marcelo Tosatti

KVM: MMU: Don't use RCU for lockless shadow walking

2012-05-16T19:08:28+00:00

Using RCU for lockless shadow walking can increase the amount of memory
in use by the system, since RCU grace periods are unpredictable.  We also
have an unconditional write to a shared variable (reader_counter), which
isn't good for scaling.

Replace that with a scheme similar to x86's get_user_pages_fast(): disable
interrupts during lockless shadow walk to force the freer
(kvm_mmu_commit_zap_page()) to wait for the TLB flush IPI to find the
processor with interrupts enabled.

We also add a new vcpu->mode, READING_SHADOW_PAGE_TABLES, to prevent
kvm_flush_remote_tlbs() from avoiding the IPI.

Signed-off-by: Avi Kivity 
Signed-off-by: Marcelo Tosatti

KVM: s390: Implement the directed yield (diag 9c) hypervisor call for KVM

2012-05-01T00:38:31+00:00

This patch implements the directed yield hypercall found on other
System z hypervisors. It delegates execution time to the virtual cpu
specified in the instruction's parameter.

Useful to avoid long spinlock waits in the guest.

Christian Borntraeger: moved common code in virt/kvm/

Signed-off-by: Konstantin Weitz 
Signed-off-by: Christian Borntraeger 
Signed-off-by: Marcelo Tosatti

KVM: Introduce direct MSI message injection for in-kernel irqchips

2012-04-24T12:59:47+00:00

Currently, MSI messages can only be injected to in-kernel irqchips by
defining a corresponding IRQ route for each message. This is not only
unhandy if the MSI messages are generated "on the fly" by user space,
IRQ routes are a limited resource that user space has to manage
carefully.

By providing a direct injection path, we can both avoid using up limited
resources and simplify the necessary steps for user land.

Signed-off-by: Jan Kiszka 
Signed-off-by: Avi Kivity

KVM: Fix page-crossing MMIO

2012-04-19T23:35:07+00:00

MMIO that are split across a page boundary are currently broken - the
code does not expect to be aborted by the exit to userspace for the
first MMIO fragment.

This patch fixes the problem by generalizing the current code for handling
16-byte MMIOs to handle a number of "fragments", and changes the MMIO
code to create those fragments.

Signed-off-by: Avi Kivity 
Signed-off-by: Marcelo Tosatti

Merge branch 'linus' into queue

2012-04-19T20:06:26+00:00

Merge reason: development work has dependency on kvm patches merged
upstream.

Conflicts:
	Documentation/feature-removal-schedule.txt

Signed-off-by: Marcelo Tosatti

KVM: unmap pages from the iommu when slots are removed

2012-04-12T01:55:25+00:00

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

KVM: Remove unused dirty_bitmap_head and nr_dirty_pages

2012-04-08T09:50:01+00:00

Now that we do neither double buffering nor heuristic selection of the
write protection method these are not needed anymore.

Note: some drivers have their own implementation of set_bit_le() and
making it generic needs a bit of work; so we use test_and_set_bit_le()
and will later replace it with generic set_bit_le().

Signed-off-by: Takuya Yoshikawa 
Signed-off-by: Avi Kivity

KVM: PPC: Rework wqp conditional code

2012-04-08T09:47:49+00:00

On PowerPC, we sometimes use a waitqueue per core, not per thread,
so we can't always use the vcpu internal waitqueue.

This code has been generalized by Christoffer Dall recently, but
unfortunately broke compilation for PowerPC. At the time the helper
function is defined, struct kvm_vcpu is not declared yet, so we can't
dereference it.

This patch moves all logic into the generic inline function, at which
time we have all information necessary.

Signed-off-by: Alexander Graf 
Signed-off-by: Marcelo Tosatti 
Signed-off-by: Avi Kivity

KVM: Factor out kvm_vcpu_kick to arch-generic code

2012-04-08T09:47:47+00:00

The kvm_vcpu_kick function performs roughly the same funcitonality on
most all architectures, so we shouldn't have separate copies.

PowerPC keeps a pointer to interchanging waitqueues on the vcpu_arch
structure and to accomodate this special need a
__KVM_HAVE_ARCH_VCPU_GET_WQ define and accompanying function
kvm_arch_vcpu_wq have been defined. For all other architectures this
is a generic inline that just returns &vcpu->wq;

Acked-by: Scott Wood 
Signed-off-by: Christoffer Dall 
Signed-off-by: Marcelo Tosatti 
Signed-off-by: Avi Kivity