kernel.git/virt/kvm/ioapic.c, branch linux-3.7.y

KVM: x86: drop parameter validation in ioapic/pic

2012-08-15T01:35:22Z

We validate irq pin number when routing is setup, so code handling illegal irq # in pic and ioapic on each injection is never called. Drop it, replace with BUG_ON to catch out of bounds access bugs. Signed-off-by: Michael S. Tsirkin Signed-off-by: Marcelo Tosatti

KVM: fix race with level interrupts

2012-07-20T19:12:00Z

When more than 1 source id is in use for the same GSI, we have the following race related to handling irq_states race: CPU 0 clears bit 0. CPU 0 read irq_state as 0. CPU 1 sets level to 1. CPU 1 calls kvm_ioapic_set_irq(1). CPU 0 calls kvm_ioapic_set_irq(0). Now ioapic thinks the level is 0 but irq_state is not 0. Fix by performing all irq_states bitmap handling under pic/ioapic lock. This also removes the need for atomics with irq_states handling. Reported-by: Gleb Natapov Signed-off-by: Michael S. Tsirkin Signed-off-by: Marcelo Tosatti

KVM: dont clear TMR on EOI

2012-04-16T23:36:38Z

Intel spec says that TMR needs to be set/cleared when IRR is set, but kvm also clears it on EOI. I did some tests on a real (AMD based) system, and I see same TMR values both before and after EOI, so I think it's a minor bug in kvm. This patch fixes TMR to be set/cleared on IRR set only as per spec. And now that we don't clear TMR, we can save an atomic read of TMR on EOI that's not propagated to ioapic, by checking whether ioapic needs a specific vector first and calculating the mode afterwards. Signed-off-by: Michael S. Tsirkin Signed-off-by: Marcelo Tosatti

KVM: drop bsp_vcpu pointer from kvm struct

2011-12-27T09:22:32Z

Drop bsp_vcpu pointer from kvm struct since its only use is incorrect anyway. Signed-off-by: Gleb Natapov Signed-off-by: Marcelo Tosatti

KVM: Allow aligned byte and word writes to IOAPIC registers.

2011-12-27T09:17:44Z

This fixes byte accesses to IOAPIC_REG_SELECT as mandated by at least the ICH10 and Intel Series 5 chipset specs. It also makes ioapic_mmio_write consistent with ioapic_mmio_read, which also allows byte and word accesses. Signed-off-by: Julian Stecklina Signed-off-by: Avi Kivity

KVM: Intelligent device lookup on I/O bus

2011-09-25T16:17:59Z

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

KVM: ioapic: Fix an error field reference

2011-05-22T12:39:27Z

Function ioapic_debug() in the ioapic_deliver() misnames one filed by reference. This patch correct it. Signed-off-by: Liu Yuan Signed-off-by: Avi Kivity

KVM: Convert mask notifiers to use irqchip/pin instead of gsi

2010-08-02T03:40:39Z

Devices register mask notifier using gsi, but irqchip knows about irqchip/pin, so conversion from irqchip/pin to gsi should be done before looking for mask notifier to call. Signed-off-by: Gleb Natapov Signed-off-by: Marcelo Tosatti

KVM: Update Red Hat copyrights

2010-08-01T07:35:51Z

Signed-off-by: Avi Kivity

KVM: read apic->irr with ioapic lock held

2010-06-10T17:29:03Z

Read ioapic->irr inside ioapic->lock protected section. KVM-Stable-Tag Signed-off-by: Marcelo Tosatti