kernel/git/stable/linux.git/virt/kvm/eventfd.c, branch linux-3.5.y

KVM: Sanitize KVM_IRQFD flags

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

We only know of one so far. Signed-off-by: Alex Williamson Signed-off-by: Marcelo Tosatti

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: Intelligent device lookup on I/O bus

2011-09-25T16:17:59+00:00

Currently the method of dealing with an IO operation on a bus (PIO/MMIO) is to call the read or write callback for each device registered on the bus until we find a device which handles it. Since the number of devices on a bus can be significant due to ioeventfds and coalesced MMIO zones, this leads to a lot of overhead on each IO operation. Instead of registering devices, we now register ranges which points to a device. Lookup is done using an efficient bsearch instead of a linear search. Performance test was conducted by comparing exit count per second with 200 ioeventfds created on one byte and the guest is trying to access a different byte continuously (triggering usermode exits). Before the patch the guest has achieved 259k exits per second, after the patch the guest does 274k exits per second. Cc: Avi Kivity Cc: Marcelo Tosatti Signed-off-by: Sasha Levin Signed-off-by: Avi Kivity

Merge branch 'kvm-updates/2.6.39' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2011-04-07T18:33:04+00:00

* 'kvm-updates/2.6.39' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: move and fix substitue search for missing CPUID entries KVM: fix XSAVE bit scanning KVM: Enable async page fault processing KVM: fix crash on irqfd deassign

KVM: fix crash on irqfd deassign

2011-04-06T10:15:55+00:00

irqfd in kvm used flush_work incorrectly: it assumed that work scheduled previously can't run after flush_work, but since kvm uses a non-reentrant workqueue (by means of schedule_work) we need flush_work_sync to get that guarantee. Signed-off-by: Michael S. Tsirkin Reported-by: Jean-Philippe Menil Tested-by: Jean-Philippe Menil Signed-off-by: Avi Kivity

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi

KVM: improve comment on rcu use in irqfd_deassign

2011-03-17T16:08:33+00:00

The RCU use in kvm_irqfd_deassign is tricky: we have rcu_assign_pointer but no synchronize_rcu: synchronize_rcu is done by kvm_irq_routing_update which we share a spinlock with. Fix up a comment in an attempt to make this clearer. Signed-off-by: Michael S. Tsirkin Signed-off-by: Avi Kivity

KVM: fast-path msi injection with irqfd

2011-01-12T09:29:38+00:00

Store irq routing table pointer in the irqfd object, and use that to inject MSI directly without bouncing out to a kernel thread. While we touch this structure, rearrange irqfd fields to make fastpath better packed for better cache utilization. This also adds some comments about locking rules and rcu usage in code. Some notes on the design: - Use pointer into the rt instead of copying an entry, to make it possible to use rcu, thus side-stepping locking complexities. We also save some memory this way. - Old workqueue code is still used for level irqs. I don't think we DTRT with level anyway, however, it seems easier to keep the code around as it has been thought through and debugged, and fix level later than rip out and re-instate it later. Signed-off-by: Michael S. Tsirkin Acked-by: Marcelo Tosatti Acked-by: Gregory Haskins Signed-off-by: Avi Kivity

KVM: fix irqfd assign/deassign race

2010-09-23T14:31:51+00:00

I think I see the following (theoretical) race: During irqfd assign, we drop irqfds lock before we schedule inject work. Therefore, deassign running on another CPU could cause shutdown and flush to run before inject, causing user after free in inject. A simple fix it to schedule inject under the lock. Signed-off-by: Michael S. Tsirkin Acked-by: Gregory Haskins Signed-off-by: Marcelo Tosatti

KVM: Update Red Hat copyrights

2010-08-01T07:35:51+00:00

Signed-off-by: Avi Kivity