On 02/26/2016 12:40 PM, Suresh Warrier wrote: > 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(-) > -- 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
