The recent changes on the XICS layer removed the XICSState object to let the sPAPR machine handle the ICP and ICS directly. The reset of these objects was previously handled by XICSState, which was a SysBus device, and to keep the same behavior, the ICP and ICS were assigned to SysbBus. But that broke the 'info qtree' command in the monitor. 'qtree' performs a loop on the children of a bus to print their properties and SysBus devices are expected to be found under SysBus, which is not the case anymore. The fix for this problem is to register reset handlers for the ICP and ICS objects and stop using SysBus for such devices. Signed-off-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Tested-by: Thomas Huth <thuth@redhat.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
438 lines
12 KiB
C
438 lines
12 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 "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "cpu.h"
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#include "hw/hw.h"
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#include "trace.h"
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#include "sysemu/kvm.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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static int kernel_xics_fd = -1;
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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 *icp)
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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 (!icp->cs) {
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return;
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}
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ret = kvm_vcpu_ioctl(icp->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(icp->cs), strerror(errno));
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exit(1);
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}
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icp->xirr = state >> KVM_REG_PPC_ICP_XISR_SHIFT;
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icp->mfrr = (state >> KVM_REG_PPC_ICP_MFRR_SHIFT)
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& KVM_REG_PPC_ICP_MFRR_MASK;
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icp->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 *icp, 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 (!icp->cs) {
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return 0;
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}
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state = ((uint64_t)icp->xirr << KVM_REG_PPC_ICP_XISR_SHIFT)
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| ((uint64_t)icp->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
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| ((uint64_t)icp->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);
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ret = kvm_vcpu_ioctl(icp->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(icp->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(void *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 as deasserted only if the CPU thread is in use */
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if (icp->output) {
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qemu_set_irq(icp->output, 0);
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}
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icp_set_kvm_state(icp, 1);
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}
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static void icp_kvm_cpu_setup(ICPState *icp, PowerPCCPU *cpu)
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{
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CPUState *cs = CPU(cpu);
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int ret;
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if (kernel_xics_fd == -1) {
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abort();
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}
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/*
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* If we are reusing a parked vCPU fd corresponding to the CPU
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* which was hot-removed earlier we don't have to renable
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* KVM_CAP_IRQ_XICS capability again.
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*/
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if (icp->cap_irq_xics_enabled) {
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return;
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}
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ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0, kernel_xics_fd,
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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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icp->cap_irq_xics_enabled = true;
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}
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static void icp_kvm_realize(DeviceState *dev, Error **errp)
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{
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qemu_register_reset(icp_kvm_reset, dev);
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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->realize = icp_kvm_realize;
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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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icpc->cpu_setup = icp_kvm_cpu_setup;
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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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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(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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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(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(void *dev)
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{
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ICSState *ics = ICS_SIMPLE(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_SIMPLE(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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qemu_register_reset(ics_kvm_reset, dev);
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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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ICSStateClass *icsc = ICS_BASE_CLASS(klass);
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icsc->realize = ics_kvm_realize;
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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_ICS_KVM,
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.parent = TYPE_ICS_SIMPLE,
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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 rtas_dummy(PowerPCCPU *cpu, sPAPRMachineState *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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int xics_kvm_init(sPAPRMachineState *spapr, Error **errp)
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{
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int rc;
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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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kernel_xics_fd = xics_create_device.fd;
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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 rc;
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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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return -1;
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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(&ics_kvm_info);
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type_register_static(&icp_kvm_info);
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}
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type_init(xics_kvm_register_types)
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