From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Suresh E. Warrier" Subject: Re: [PATCH 00/14] KVM: PPC: Book3S HV: PCI Passthrough Interrupt Optimizations Date: Fri, 26 Feb 2016 12:49:42 -0600 Message-ID: <56D09E46.6090400@linux.vnet.ibm.com> References: <1456512032-31286-1-git-send-email-warrier@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: paulus@samba.org, agraf@suse.de To: kvm@vger.kernel.org, linuxppc-dev@ozlabs.org Return-path: Received: from e33.co.us.ibm.com ([32.97.110.151]:56866 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754589AbcBZStt (ORCPT ); Fri, 26 Feb 2016 13:49:49 -0500 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 26 Feb 2016 11:49:49 -0700 Received: from b03cxnp08025.gho.boulder.ibm.com (b03cxnp08025.gho.boulder.ibm.com [9.17.130.17]) by d03dlp02.boulder.ibm.com (Postfix) with ESMTP id A7B3F3E40047 for ; Fri, 26 Feb 2016 11:49:47 -0700 (MST) Received: from d03av05.boulder.ibm.com (d03av05.boulder.ibm.com [9.17.195.85]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u1QInlIa45809904 for ; Fri, 26 Feb 2016 11:49:47 -0700 Received: from d03av05.boulder.ibm.com (localhost [127.0.0.1]) by d03av05.boulder.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u1QInja3015427 for ; Fri, 26 Feb 2016 11:49:47 -0700 In-Reply-To: <1456512032-31286-1-git-send-email-warrier@linux.vnet.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: 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(-) >