This patch set adds support for handling interrupts for PCI adapters entirely in the guest under the right conditions. When an interrupt is received by KVM in real mode, if the interrupt is from a PCI passthrough adapter owned by the guest, KVM will update the virtual ICP for the VCPU that is the target of the interrupt entirely in real mode and generate the virtual interrupt. If the VCPU is not running in the guest, it will wake up the VCPU. It will also update the affinity of the interrupt to directly target the CPU (core) where this VCPU is being scheduled as an optimization. KVM needs the mapping between hardware interrupt numbers in the host to the virtual hardware interrupt (GSI) that needs to get injected into the guest. This patch set takes advantage of the IRQ bypass manager feature to create this mapping. For now, we allocate and manage a separate mapping structure per VM. Although a mapping is created for every passthrough IRQ requested in the guest, we also maintain a cache of mappings that is used to speed up search. For now, KVM real mode code only looks in the cache for a mapping. If no mapping is found, we fall back on the usual interrupt routing mechanism - switch back to host and run the VFIO interrupt handler. This is based on 4.5-rc1 plus the patch set in http://www.spinics.net/lists/kvm-ppc/msg11131.html since it has dependencies on vmalloc_to_phys() being public. Suresh Warrier (14): powerpc: Add simple cache inhibited MMIO accessors KVM: PPC: Book3S HV: Convert kvmppc_read_intr to a C function KVM: PPC: select IRQ_BYPASS_MANAGER KVM: PPC: Book3S HV: Introduce kvmppc_passthru_irqmap KVM: PPC: Book3S HV: Enable IRQ bypass KVM: PPC: Book3S HV: Caching for passthrough IRQ map KVM: PPC: Book3S HV: Handle passthrough interrupts in guest KVM: PPC: Book3S HV: Complete passthrough interrupt in host KVM: PPC: Book3S HV: Enable KVM real mode handling of passthrough IRQs KVM: PPC: Book3S HV: Dump irqmap in debugfs KVM: PPC: Book3S HV: Tunable to disable KVM IRQ bypass KVM: PPC: Book3S HV: Update irq stats for IRQs handled in real mode KVM: PPC: Book3S HV: Change affinity for passthrough IRQ KVM: PPC: Book3S HV: Counters for passthrough IRQ stats arch/powerpc/include/asm/io.h | 28 +++ arch/powerpc/include/asm/kvm_asm.h | 10 + arch/powerpc/include/asm/kvm_book3s.h | 1 + arch/powerpc/include/asm/kvm_host.h | 25 +++ arch/powerpc/include/asm/kvm_ppc.h | 28 +++ arch/powerpc/include/asm/pnv-pci.h | 1 + arch/powerpc/kvm/Kconfig | 2 + arch/powerpc/kvm/book3s.c | 45 +++++ arch/powerpc/kvm/book3s_hv.c | 318 +++++++++++++++++++++++++++++- arch/powerpc/kvm/book3s_hv_builtin.c | 157 +++++++++++++++ arch/powerpc/kvm/book3s_hv_rm_xics.c | 181 +++++++++++++++++ arch/powerpc/kvm/book3s_hv_rmhandlers.S | 226 ++++++++++++--------- arch/powerpc/kvm/book3s_xics.c | 68 ++++++- arch/powerpc/kvm/book3s_xics.h | 3 + arch/powerpc/platforms/powernv/pci-ioda.c | 14 +- 15 files changed, 1013 insertions(+), 94 deletions(-) -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
