Compute kvm_irqfds_allowed by checking the KVM_CAP_IRQFD extension. Remove direct settings in architecture specific files. Add a new kvm_resamplefds_allowed variable, initialized by checking the KVM_CAP_IRQFD_RESAMPLE extension. Add a corresponding kvm_resamplefds_enabled() function. A special notice for s390 where KVM_CAP_IRQFD was not immediatly advirtised when irqfd capability was introduced in the kernel. KVM_CAP_IRQ_ROUTING was advertised instead. This was fixed in "KVM: s390: announce irqfd capability", ebc3226202d5956a5963185222982d435378b899 whereas irqfd support was brought in 84223598778ba08041f4297fda485df83414d57e, "KVM: s390: irq routing for adapter interrupts". Both commits first appear in 3.15 so there should not be any kernel version impacted by this QEMU modification. Signed-off-by: Eric Auger <eric.auger@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
499 lines
14 KiB
C
499 lines
14 KiB
C
/*
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* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
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*
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* PAPR Virtualized Interrupt System, aka ICS/ICP aka xics, in-kernel emulation
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*
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* Copyright (c) 2013 David Gibson, IBM Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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#include "hw/hw.h"
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#include "trace.h"
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#include "hw/ppc/spapr.h"
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#include "hw/ppc/xics.h"
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#include "kvm_ppc.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include <sys/ioctl.h>
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typedef struct KVMXICSState {
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XICSState parent_obj;
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int kernel_xics_fd;
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} KVMXICSState;
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/*
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* ICP-KVM
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*/
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static void icp_get_kvm_state(ICPState *ss)
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{
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uint64_t state;
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struct kvm_one_reg reg = {
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.id = KVM_REG_PPC_ICP_STATE,
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.addr = (uintptr_t)&state,
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};
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int ret;
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/* ICP for this CPU thread is not in use, exiting */
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if (!ss->cs) {
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return;
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}
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ret = kvm_vcpu_ioctl(ss->cs, KVM_GET_ONE_REG, ®);
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if (ret != 0) {
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error_report("Unable to retrieve KVM interrupt controller state"
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" for CPU %ld: %s", kvm_arch_vcpu_id(ss->cs), strerror(errno));
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exit(1);
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}
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ss->xirr = state >> KVM_REG_PPC_ICP_XISR_SHIFT;
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ss->mfrr = (state >> KVM_REG_PPC_ICP_MFRR_SHIFT)
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& KVM_REG_PPC_ICP_MFRR_MASK;
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ss->pending_priority = (state >> KVM_REG_PPC_ICP_PPRI_SHIFT)
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& KVM_REG_PPC_ICP_PPRI_MASK;
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}
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static int icp_set_kvm_state(ICPState *ss, int version_id)
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{
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uint64_t state;
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struct kvm_one_reg reg = {
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.id = KVM_REG_PPC_ICP_STATE,
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.addr = (uintptr_t)&state,
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};
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int ret;
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/* ICP for this CPU thread is not in use, exiting */
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if (!ss->cs) {
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return 0;
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}
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state = ((uint64_t)ss->xirr << KVM_REG_PPC_ICP_XISR_SHIFT)
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| ((uint64_t)ss->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
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| ((uint64_t)ss->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);
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ret = kvm_vcpu_ioctl(ss->cs, KVM_SET_ONE_REG, ®);
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if (ret != 0) {
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error_report("Unable to restore KVM interrupt controller state (0x%"
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PRIx64 ") for CPU %ld: %s", state, kvm_arch_vcpu_id(ss->cs),
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strerror(errno));
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return ret;
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}
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return 0;
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}
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static void icp_kvm_reset(DeviceState *dev)
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{
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ICPState *icp = ICP(dev);
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icp->xirr = 0;
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icp->pending_priority = 0xff;
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icp->mfrr = 0xff;
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/* Make all outputs are deasserted */
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qemu_set_irq(icp->output, 0);
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icp_set_kvm_state(icp, 1);
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}
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static void icp_kvm_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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ICPStateClass *icpc = ICP_CLASS(klass);
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dc->reset = icp_kvm_reset;
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icpc->pre_save = icp_get_kvm_state;
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icpc->post_load = icp_set_kvm_state;
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}
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static const TypeInfo icp_kvm_info = {
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.name = TYPE_KVM_ICP,
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.parent = TYPE_ICP,
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.instance_size = sizeof(ICPState),
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.class_init = icp_kvm_class_init,
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.class_size = sizeof(ICPStateClass),
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};
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/*
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* ICS-KVM
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*/
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static void ics_get_kvm_state(ICSState *ics)
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{
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KVMXICSState *icpkvm = KVM_XICS(ics->icp);
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uint64_t state;
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struct kvm_device_attr attr = {
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.flags = 0,
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.group = KVM_DEV_XICS_GRP_SOURCES,
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.addr = (uint64_t)(uintptr_t)&state,
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};
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int i;
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for (i = 0; i < ics->nr_irqs; i++) {
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ICSIRQState *irq = &ics->irqs[i];
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int ret;
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attr.attr = i + ics->offset;
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ret = ioctl(icpkvm->kernel_xics_fd, KVM_GET_DEVICE_ATTR, &attr);
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if (ret != 0) {
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error_report("Unable to retrieve KVM interrupt controller state"
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" for IRQ %d: %s", i + ics->offset, strerror(errno));
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exit(1);
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}
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irq->server = state & KVM_XICS_DESTINATION_MASK;
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irq->saved_priority = (state >> KVM_XICS_PRIORITY_SHIFT)
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& KVM_XICS_PRIORITY_MASK;
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/*
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* To be consistent with the software emulation in xics.c, we
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* split out the masked state + priority that we get from the
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* kernel into 'current priority' (0xff if masked) and
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* 'saved priority' (if masked, this is the priority the
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* interrupt had before it was masked). Masking and unmasking
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* are done with the ibm,int-off and ibm,int-on RTAS calls.
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*/
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if (state & KVM_XICS_MASKED) {
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irq->priority = 0xff;
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} else {
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irq->priority = irq->saved_priority;
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}
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if (state & KVM_XICS_PENDING) {
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if (state & KVM_XICS_LEVEL_SENSITIVE) {
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irq->status |= XICS_STATUS_ASSERTED;
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} else {
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/*
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* A pending edge-triggered interrupt (or MSI)
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* must have been rejected previously when we
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* first detected it and tried to deliver it,
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* so mark it as pending and previously rejected
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* for consistency with how xics.c works.
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*/
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irq->status |= XICS_STATUS_MASKED_PENDING
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| XICS_STATUS_REJECTED;
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}
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}
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}
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}
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static int ics_set_kvm_state(ICSState *ics, int version_id)
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{
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KVMXICSState *icpkvm = KVM_XICS(ics->icp);
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uint64_t state;
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struct kvm_device_attr attr = {
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.flags = 0,
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.group = KVM_DEV_XICS_GRP_SOURCES,
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.addr = (uint64_t)(uintptr_t)&state,
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};
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int i;
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for (i = 0; i < ics->nr_irqs; i++) {
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ICSIRQState *irq = &ics->irqs[i];
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int ret;
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attr.attr = i + ics->offset;
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state = irq->server;
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state |= (uint64_t)(irq->saved_priority & KVM_XICS_PRIORITY_MASK)
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<< KVM_XICS_PRIORITY_SHIFT;
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if (irq->priority != irq->saved_priority) {
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assert(irq->priority == 0xff);
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state |= KVM_XICS_MASKED;
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}
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if (ics->irqs[i].flags & XICS_FLAGS_IRQ_LSI) {
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state |= KVM_XICS_LEVEL_SENSITIVE;
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if (irq->status & XICS_STATUS_ASSERTED) {
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state |= KVM_XICS_PENDING;
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}
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} else {
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if (irq->status & XICS_STATUS_MASKED_PENDING) {
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state |= KVM_XICS_PENDING;
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}
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}
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ret = ioctl(icpkvm->kernel_xics_fd, KVM_SET_DEVICE_ATTR, &attr);
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if (ret != 0) {
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error_report("Unable to restore KVM interrupt controller state"
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" for IRQs %d: %s", i + ics->offset, strerror(errno));
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return ret;
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}
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}
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return 0;
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}
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static void ics_kvm_set_irq(void *opaque, int srcno, int val)
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{
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ICSState *ics = opaque;
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struct kvm_irq_level args;
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int rc;
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args.irq = srcno + ics->offset;
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if (ics->irqs[srcno].flags & XICS_FLAGS_IRQ_MSI) {
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if (!val) {
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return;
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}
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args.level = KVM_INTERRUPT_SET;
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} else {
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args.level = val ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;
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}
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rc = kvm_vm_ioctl(kvm_state, KVM_IRQ_LINE, &args);
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if (rc < 0) {
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perror("kvm_irq_line");
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}
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}
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static void ics_kvm_reset(DeviceState *dev)
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{
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ICSState *ics = ICS(dev);
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int i;
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uint8_t flags[ics->nr_irqs];
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for (i = 0; i < ics->nr_irqs; i++) {
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flags[i] = ics->irqs[i].flags;
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}
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memset(ics->irqs, 0, sizeof(ICSIRQState) * ics->nr_irqs);
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for (i = 0; i < ics->nr_irqs; i++) {
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ics->irqs[i].priority = 0xff;
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ics->irqs[i].saved_priority = 0xff;
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ics->irqs[i].flags = flags[i];
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}
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ics_set_kvm_state(ics, 1);
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}
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static void ics_kvm_realize(DeviceState *dev, Error **errp)
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{
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ICSState *ics = ICS(dev);
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if (!ics->nr_irqs) {
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error_setg(errp, "Number of interrupts needs to be greater 0");
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return;
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}
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ics->irqs = g_malloc0(ics->nr_irqs * sizeof(ICSIRQState));
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ics->qirqs = qemu_allocate_irqs(ics_kvm_set_irq, ics, ics->nr_irqs);
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}
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static void ics_kvm_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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ICSStateClass *icsc = ICS_CLASS(klass);
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dc->realize = ics_kvm_realize;
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dc->reset = ics_kvm_reset;
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icsc->pre_save = ics_get_kvm_state;
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icsc->post_load = ics_set_kvm_state;
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}
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static const TypeInfo ics_kvm_info = {
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.name = TYPE_KVM_ICS,
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.parent = TYPE_ICS,
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.instance_size = sizeof(ICSState),
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.class_init = ics_kvm_class_init,
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};
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/*
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* XICS-KVM
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*/
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static void xics_kvm_cpu_setup(XICSState *icp, PowerPCCPU *cpu)
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{
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CPUState *cs;
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ICPState *ss;
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KVMXICSState *icpkvm = KVM_XICS(icp);
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cs = CPU(cpu);
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ss = &icp->ss[cs->cpu_index];
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assert(cs->cpu_index < icp->nr_servers);
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if (icpkvm->kernel_xics_fd == -1) {
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abort();
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}
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if (icpkvm->kernel_xics_fd != -1) {
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int ret;
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ss->cs = cs;
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ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0,
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icpkvm->kernel_xics_fd, kvm_arch_vcpu_id(cs));
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if (ret < 0) {
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error_report("Unable to connect CPU%ld to kernel XICS: %s",
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kvm_arch_vcpu_id(cs), strerror(errno));
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exit(1);
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}
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}
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}
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static void xics_kvm_set_nr_irqs(XICSState *icp, uint32_t nr_irqs, Error **errp)
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{
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icp->nr_irqs = icp->ics->nr_irqs = nr_irqs;
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}
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static void xics_kvm_set_nr_servers(XICSState *icp, uint32_t nr_servers,
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Error **errp)
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{
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int i;
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icp->nr_servers = nr_servers;
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icp->ss = g_malloc0(icp->nr_servers*sizeof(ICPState));
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for (i = 0; i < icp->nr_servers; i++) {
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char buffer[32];
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object_initialize(&icp->ss[i], sizeof(icp->ss[i]), TYPE_KVM_ICP);
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snprintf(buffer, sizeof(buffer), "icp[%d]", i);
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object_property_add_child(OBJECT(icp), buffer, OBJECT(&icp->ss[i]),
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errp);
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}
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}
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static void rtas_dummy(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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uint32_t token,
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uint32_t nargs, target_ulong args,
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uint32_t nret, target_ulong rets)
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{
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error_report("pseries: %s must never be called for in-kernel XICS",
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__func__);
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}
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static void xics_kvm_realize(DeviceState *dev, Error **errp)
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{
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KVMXICSState *icpkvm = KVM_XICS(dev);
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XICSState *icp = XICS_COMMON(dev);
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int i, rc;
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Error *error = NULL;
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struct kvm_create_device xics_create_device = {
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.type = KVM_DEV_TYPE_XICS,
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.flags = 0,
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};
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if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_IRQ_XICS)) {
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error_setg(errp,
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"KVM and IRQ_XICS capability must be present for in-kernel XICS");
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goto fail;
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}
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spapr_rtas_register(RTAS_IBM_SET_XIVE, "ibm,set-xive", rtas_dummy);
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spapr_rtas_register(RTAS_IBM_GET_XIVE, "ibm,get-xive", rtas_dummy);
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spapr_rtas_register(RTAS_IBM_INT_OFF, "ibm,int-off", rtas_dummy);
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spapr_rtas_register(RTAS_IBM_INT_ON, "ibm,int-on", rtas_dummy);
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rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_SET_XIVE, "ibm,set-xive");
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if (rc < 0) {
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error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,set-xive");
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goto fail;
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}
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rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_GET_XIVE, "ibm,get-xive");
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if (rc < 0) {
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error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,get-xive");
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goto fail;
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}
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rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_ON, "ibm,int-on");
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if (rc < 0) {
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error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-on");
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goto fail;
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}
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rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_OFF, "ibm,int-off");
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if (rc < 0) {
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error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-off");
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goto fail;
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}
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/* Create the kernel ICP */
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rc = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &xics_create_device);
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if (rc < 0) {
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error_setg_errno(errp, -rc, "Error on KVM_CREATE_DEVICE for XICS");
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goto fail;
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}
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icpkvm->kernel_xics_fd = xics_create_device.fd;
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object_property_set_bool(OBJECT(icp->ics), true, "realized", &error);
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if (error) {
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error_propagate(errp, error);
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goto fail;
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}
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assert(icp->nr_servers);
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for (i = 0; i < icp->nr_servers; i++) {
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object_property_set_bool(OBJECT(&icp->ss[i]), true, "realized", &error);
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if (error) {
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error_propagate(errp, error);
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goto fail;
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}
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}
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kvm_kernel_irqchip = true;
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kvm_msi_via_irqfd_allowed = true;
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kvm_gsi_direct_mapping = true;
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return;
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fail:
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kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
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kvmppc_define_rtas_kernel_token(0, "ibm,get-xive");
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kvmppc_define_rtas_kernel_token(0, "ibm,int-on");
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kvmppc_define_rtas_kernel_token(0, "ibm,int-off");
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}
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static void xics_kvm_initfn(Object *obj)
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{
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XICSState *xics = XICS_COMMON(obj);
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xics->ics = ICS(object_new(TYPE_KVM_ICS));
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object_property_add_child(obj, "ics", OBJECT(xics->ics), NULL);
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xics->ics->icp = xics;
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}
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static void xics_kvm_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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XICSStateClass *xsc = XICS_COMMON_CLASS(oc);
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dc->realize = xics_kvm_realize;
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xsc->cpu_setup = xics_kvm_cpu_setup;
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xsc->set_nr_irqs = xics_kvm_set_nr_irqs;
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xsc->set_nr_servers = xics_kvm_set_nr_servers;
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}
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static const TypeInfo xics_kvm_info = {
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.name = TYPE_KVM_XICS,
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.parent = TYPE_XICS_COMMON,
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.instance_size = sizeof(KVMXICSState),
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.class_init = xics_kvm_class_init,
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.instance_init = xics_kvm_initfn,
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};
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static void xics_kvm_register_types(void)
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{
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type_register_static(&xics_kvm_info);
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type_register_static(&ics_kvm_info);
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type_register_static(&icp_kvm_info);
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}
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|
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type_init(xics_kvm_register_types)
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