870 lines
24 KiB
C
870 lines
24 KiB
C
/*
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* QEMU PowerPC sPAPR XIVE interrupt controller model
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*
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* Copyright (c) 2017-2019, IBM Corporation.
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*
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* This code is licensed under the GPL version 2 or later. See the
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* COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/log.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "target/ppc/cpu.h"
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#include "sysemu/cpus.h"
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#include "sysemu/kvm.h"
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#include "sysemu/runstate.h"
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#include "hw/ppc/spapr.h"
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#include "hw/ppc/spapr_cpu_core.h"
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#include "hw/ppc/spapr_xive.h"
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#include "hw/ppc/xive.h"
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#include "kvm_ppc.h"
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#include "trace.h"
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#include <sys/ioctl.h>
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/*
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* Helpers for CPU hotplug
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*
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* TODO: make a common KVMEnabledCPU layer for XICS and XIVE
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*/
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typedef struct KVMEnabledCPU {
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unsigned long vcpu_id;
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QLIST_ENTRY(KVMEnabledCPU) node;
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} KVMEnabledCPU;
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static QLIST_HEAD(, KVMEnabledCPU)
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kvm_enabled_cpus = QLIST_HEAD_INITIALIZER(&kvm_enabled_cpus);
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static bool kvm_cpu_is_enabled(CPUState *cs)
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{
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KVMEnabledCPU *enabled_cpu;
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unsigned long vcpu_id = kvm_arch_vcpu_id(cs);
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QLIST_FOREACH(enabled_cpu, &kvm_enabled_cpus, node) {
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if (enabled_cpu->vcpu_id == vcpu_id) {
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return true;
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}
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}
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return false;
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}
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static void kvm_cpu_enable(CPUState *cs)
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{
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KVMEnabledCPU *enabled_cpu;
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unsigned long vcpu_id = kvm_arch_vcpu_id(cs);
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enabled_cpu = g_malloc(sizeof(*enabled_cpu));
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enabled_cpu->vcpu_id = vcpu_id;
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QLIST_INSERT_HEAD(&kvm_enabled_cpus, enabled_cpu, node);
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}
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static void kvm_cpu_disable_all(void)
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{
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KVMEnabledCPU *enabled_cpu, *next;
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QLIST_FOREACH_SAFE(enabled_cpu, &kvm_enabled_cpus, node, next) {
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QLIST_REMOVE(enabled_cpu, node);
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g_free(enabled_cpu);
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}
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}
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/*
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* XIVE Thread Interrupt Management context (KVM)
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*/
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int kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp)
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{
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SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
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uint64_t state[2];
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int ret;
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assert(xive->fd != -1);
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/* word0 and word1 of the OS ring. */
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state[0] = *((uint64_t *) &tctx->regs[TM_QW1_OS]);
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ret = kvm_set_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
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if (ret != 0) {
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error_setg_errno(errp, -ret,
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"XIVE: could not restore KVM state of CPU %ld",
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kvm_arch_vcpu_id(tctx->cs));
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return ret;
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}
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return 0;
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}
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int kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp)
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{
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SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
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uint64_t state[2] = { 0 };
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int ret;
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assert(xive->fd != -1);
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ret = kvm_get_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
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if (ret != 0) {
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error_setg_errno(errp, -ret,
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"XIVE: could not capture KVM state of CPU %ld",
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kvm_arch_vcpu_id(tctx->cs));
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return ret;
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}
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/* word0 and word1 of the OS ring. */
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*((uint64_t *) &tctx->regs[TM_QW1_OS]) = state[0];
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return 0;
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}
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typedef struct {
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XiveTCTX *tctx;
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Error **errp;
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int ret;
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} XiveCpuGetState;
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static void kvmppc_xive_cpu_do_synchronize_state(CPUState *cpu,
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run_on_cpu_data arg)
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{
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XiveCpuGetState *s = arg.host_ptr;
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s->ret = kvmppc_xive_cpu_get_state(s->tctx, s->errp);
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}
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int kvmppc_xive_cpu_synchronize_state(XiveTCTX *tctx, Error **errp)
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{
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XiveCpuGetState s = {
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.tctx = tctx,
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.errp = errp,
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};
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/*
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* Kick the vCPU to make sure they are available for the KVM ioctl.
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*/
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run_on_cpu(tctx->cs, kvmppc_xive_cpu_do_synchronize_state,
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RUN_ON_CPU_HOST_PTR(&s));
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return s.ret;
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}
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int kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp)
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{
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ERRP_GUARD();
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SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
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unsigned long vcpu_id;
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int ret;
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assert(xive->fd != -1);
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/* Check if CPU was hot unplugged and replugged. */
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if (kvm_cpu_is_enabled(tctx->cs)) {
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return 0;
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}
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vcpu_id = kvm_arch_vcpu_id(tctx->cs);
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trace_kvm_xive_cpu_connect(vcpu_id);
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ret = kvm_vcpu_enable_cap(tctx->cs, KVM_CAP_PPC_IRQ_XIVE, 0, xive->fd,
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vcpu_id, 0);
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if (ret < 0) {
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error_setg_errno(errp, -ret,
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"XIVE: unable to connect CPU%ld to KVM device",
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vcpu_id);
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if (ret == -ENOSPC) {
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error_append_hint(errp, "Try -smp maxcpus=N with N < %u\n",
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MACHINE(qdev_get_machine())->smp.max_cpus);
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}
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return ret;
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}
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kvm_cpu_enable(tctx->cs);
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return 0;
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}
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/*
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* XIVE Interrupt Source (KVM)
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*/
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int kvmppc_xive_set_source_config(SpaprXive *xive, uint32_t lisn, XiveEAS *eas,
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Error **errp)
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{
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uint32_t end_idx;
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uint32_t end_blk;
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uint8_t priority;
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uint32_t server;
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bool masked;
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uint32_t eisn;
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uint64_t kvm_src;
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assert(xive_eas_is_valid(eas));
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end_idx = xive_get_field64(EAS_END_INDEX, eas->w);
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end_blk = xive_get_field64(EAS_END_BLOCK, eas->w);
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eisn = xive_get_field64(EAS_END_DATA, eas->w);
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masked = xive_eas_is_masked(eas);
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spapr_xive_end_to_target(end_blk, end_idx, &server, &priority);
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kvm_src = priority << KVM_XIVE_SOURCE_PRIORITY_SHIFT &
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KVM_XIVE_SOURCE_PRIORITY_MASK;
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kvm_src |= server << KVM_XIVE_SOURCE_SERVER_SHIFT &
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KVM_XIVE_SOURCE_SERVER_MASK;
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kvm_src |= ((uint64_t) masked << KVM_XIVE_SOURCE_MASKED_SHIFT) &
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KVM_XIVE_SOURCE_MASKED_MASK;
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kvm_src |= ((uint64_t)eisn << KVM_XIVE_SOURCE_EISN_SHIFT) &
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KVM_XIVE_SOURCE_EISN_MASK;
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return kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE_CONFIG, lisn,
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&kvm_src, true, errp);
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}
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void kvmppc_xive_sync_source(SpaprXive *xive, uint32_t lisn, Error **errp)
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{
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kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE_SYNC, lisn,
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NULL, true, errp);
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}
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/*
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* At reset, the interrupt sources are simply created and MASKED. We
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* only need to inform the KVM XIVE device about their type: LSI or
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* MSI.
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*/
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int kvmppc_xive_source_reset_one(XiveSource *xsrc, int srcno, Error **errp)
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{
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SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
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uint64_t state = 0;
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trace_kvm_xive_source_reset(srcno);
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assert(xive->fd != -1);
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if (xive_source_irq_is_lsi(xsrc, srcno)) {
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state |= KVM_XIVE_LEVEL_SENSITIVE;
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if (xive_source_is_asserted(xsrc, srcno)) {
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state |= KVM_XIVE_LEVEL_ASSERTED;
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}
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}
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return kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE, srcno, &state,
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true, errp);
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}
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static int kvmppc_xive_source_reset(XiveSource *xsrc, Error **errp)
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{
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SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
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int i;
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for (i = 0; i < xsrc->nr_irqs; i++) {
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int ret;
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if (!xive_eas_is_valid(&xive->eat[i])) {
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continue;
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}
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ret = kvmppc_xive_source_reset_one(xsrc, i, errp);
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if (ret < 0) {
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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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/*
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* This is used to perform the magic loads on the ESB pages, described
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* in xive.h.
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*
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* Memory barriers should not be needed for loads (no store for now).
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*/
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static uint64_t xive_esb_rw(XiveSource *xsrc, int srcno, uint32_t offset,
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uint64_t data, bool write)
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{
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uint64_t *addr = xsrc->esb_mmap + xive_source_esb_mgmt(xsrc, srcno) +
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offset;
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if (write) {
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*addr = cpu_to_be64(data);
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return -1;
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} else {
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/* Prevent the compiler from optimizing away the load */
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volatile uint64_t value = be64_to_cpu(*addr);
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return value;
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}
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}
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static uint8_t xive_esb_read(XiveSource *xsrc, int srcno, uint32_t offset)
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{
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return xive_esb_rw(xsrc, srcno, offset, 0, 0) & 0x3;
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}
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static void kvmppc_xive_esb_trigger(XiveSource *xsrc, int srcno)
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{
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xive_esb_rw(xsrc, srcno, 0, 0, true);
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}
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uint64_t kvmppc_xive_esb_rw(XiveSource *xsrc, int srcno, uint32_t offset,
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uint64_t data, bool write)
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{
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if (write) {
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return xive_esb_rw(xsrc, srcno, offset, data, 1);
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}
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/*
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* Special Load EOI handling for LSI sources. Q bit is never set
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* and the interrupt should be re-triggered if the level is still
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* asserted.
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*/
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if (xive_source_irq_is_lsi(xsrc, srcno) &&
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offset == XIVE_ESB_LOAD_EOI) {
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xive_esb_read(xsrc, srcno, XIVE_ESB_SET_PQ_00);
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if (xive_source_is_asserted(xsrc, srcno)) {
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kvmppc_xive_esb_trigger(xsrc, srcno);
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}
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return 0;
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} else {
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return xive_esb_rw(xsrc, srcno, offset, 0, 0);
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}
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}
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static void kvmppc_xive_source_get_state(XiveSource *xsrc)
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{
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SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
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int i;
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for (i = 0; i < xsrc->nr_irqs; i++) {
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uint8_t pq;
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if (!xive_eas_is_valid(&xive->eat[i])) {
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continue;
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}
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/* Perform a load without side effect to retrieve the PQ bits */
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pq = xive_esb_read(xsrc, i, XIVE_ESB_GET);
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/* and save PQ locally */
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xive_source_esb_set(xsrc, i, pq);
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}
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}
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void kvmppc_xive_source_set_irq(void *opaque, int srcno, int val)
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{
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XiveSource *xsrc = opaque;
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if (!xive_source_irq_is_lsi(xsrc, srcno)) {
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if (!val) {
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return;
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}
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} else {
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xive_source_set_asserted(xsrc, srcno, val);
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}
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kvmppc_xive_esb_trigger(xsrc, srcno);
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}
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/*
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* sPAPR XIVE interrupt controller (KVM)
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*/
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int kvmppc_xive_get_queue_config(SpaprXive *xive, uint8_t end_blk,
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uint32_t end_idx, XiveEND *end,
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Error **errp)
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{
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struct kvm_ppc_xive_eq kvm_eq = { 0 };
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uint64_t kvm_eq_idx;
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uint8_t priority;
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uint32_t server;
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int ret;
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assert(xive_end_is_valid(end));
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/* Encode the tuple (server, prio) as a KVM EQ index */
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spapr_xive_end_to_target(end_blk, end_idx, &server, &priority);
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kvm_eq_idx = priority << KVM_XIVE_EQ_PRIORITY_SHIFT &
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KVM_XIVE_EQ_PRIORITY_MASK;
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kvm_eq_idx |= server << KVM_XIVE_EQ_SERVER_SHIFT &
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KVM_XIVE_EQ_SERVER_MASK;
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ret = kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
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&kvm_eq, false, errp);
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if (ret < 0) {
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return ret;
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}
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/*
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* The EQ index and toggle bit are updated by HW. These are the
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* only fields from KVM we want to update QEMU with. The other END
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* fields should already be in the QEMU END table.
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*/
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end->w1 = xive_set_field32(END_W1_GENERATION, 0ul, kvm_eq.qtoggle) |
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xive_set_field32(END_W1_PAGE_OFF, 0ul, kvm_eq.qindex);
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return 0;
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}
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int kvmppc_xive_set_queue_config(SpaprXive *xive, uint8_t end_blk,
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uint32_t end_idx, XiveEND *end,
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Error **errp)
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{
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struct kvm_ppc_xive_eq kvm_eq = { 0 };
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uint64_t kvm_eq_idx;
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uint8_t priority;
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uint32_t server;
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/*
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* Build the KVM state from the local END structure.
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*/
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kvm_eq.flags = 0;
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if (xive_get_field32(END_W0_UCOND_NOTIFY, end->w0)) {
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kvm_eq.flags |= KVM_XIVE_EQ_ALWAYS_NOTIFY;
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}
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/*
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* If the hcall is disabling the EQ, set the size and page address
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* to zero. When migrating, only valid ENDs are taken into
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* account.
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*/
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if (xive_end_is_valid(end)) {
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kvm_eq.qshift = xive_get_field32(END_W0_QSIZE, end->w0) + 12;
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kvm_eq.qaddr = xive_end_qaddr(end);
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/*
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* The EQ toggle bit and index should only be relevant when
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* restoring the EQ state
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*/
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kvm_eq.qtoggle = xive_get_field32(END_W1_GENERATION, end->w1);
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kvm_eq.qindex = xive_get_field32(END_W1_PAGE_OFF, end->w1);
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} else {
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kvm_eq.qshift = 0;
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kvm_eq.qaddr = 0;
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}
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/* Encode the tuple (server, prio) as a KVM EQ index */
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spapr_xive_end_to_target(end_blk, end_idx, &server, &priority);
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kvm_eq_idx = priority << KVM_XIVE_EQ_PRIORITY_SHIFT &
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KVM_XIVE_EQ_PRIORITY_MASK;
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kvm_eq_idx |= server << KVM_XIVE_EQ_SERVER_SHIFT &
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KVM_XIVE_EQ_SERVER_MASK;
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return
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kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
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&kvm_eq, true, errp);
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}
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void kvmppc_xive_reset(SpaprXive *xive, Error **errp)
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{
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kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_CTRL, KVM_DEV_XIVE_RESET,
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NULL, true, errp);
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}
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static int kvmppc_xive_get_queues(SpaprXive *xive, Error **errp)
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{
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int i;
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int ret;
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for (i = 0; i < xive->nr_ends; i++) {
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if (!xive_end_is_valid(&xive->endt[i])) {
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continue;
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}
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ret = kvmppc_xive_get_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
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&xive->endt[i], errp);
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if (ret < 0) {
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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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/*
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* The primary goal of the XIVE VM change handler is to mark the EQ
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* pages dirty when all XIVE event notifications have stopped.
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*
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* Whenever the VM is stopped, the VM change handler sets the source
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* PQs to PENDING to stop the flow of events and to possibly catch a
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* triggered interrupt occuring while the VM is stopped. The previous
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* state is saved in anticipation of a migration. The XIVE controller
|
|
* is then synced through KVM to flush any in-flight event
|
|
* notification and stabilize the EQs.
|
|
*
|
|
* At this stage, we can mark the EQ page dirty and let a migration
|
|
* sequence transfer the EQ pages to the destination, which is done
|
|
* just after the stop state.
|
|
*
|
|
* The previous configuration of the sources is restored when the VM
|
|
* runs again. If an interrupt was queued while the VM was stopped,
|
|
* simply generate a trigger.
|
|
*/
|
|
static void kvmppc_xive_change_state_handler(void *opaque, bool running,
|
|
RunState state)
|
|
{
|
|
SpaprXive *xive = opaque;
|
|
XiveSource *xsrc = &xive->source;
|
|
Error *local_err = NULL;
|
|
int i;
|
|
|
|
/*
|
|
* Restore the sources to their initial state. This is called when
|
|
* the VM resumes after a stop or a migration.
|
|
*/
|
|
if (running) {
|
|
for (i = 0; i < xsrc->nr_irqs; i++) {
|
|
uint8_t pq;
|
|
uint8_t old_pq;
|
|
|
|
if (!xive_eas_is_valid(&xive->eat[i])) {
|
|
continue;
|
|
}
|
|
|
|
pq = xive_source_esb_get(xsrc, i);
|
|
old_pq = xive_esb_read(xsrc, i, XIVE_ESB_SET_PQ_00 + (pq << 8));
|
|
|
|
/*
|
|
* An interrupt was queued while the VM was stopped,
|
|
* generate a trigger.
|
|
*/
|
|
if (pq == XIVE_ESB_RESET && old_pq == XIVE_ESB_QUEUED) {
|
|
kvmppc_xive_esb_trigger(xsrc, i);
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Mask the sources, to stop the flow of event notifications, and
|
|
* save the PQs locally in the XiveSource object. The XiveSource
|
|
* state will be collected later on by its vmstate handler if a
|
|
* migration is in progress.
|
|
*/
|
|
for (i = 0; i < xsrc->nr_irqs; i++) {
|
|
uint8_t pq;
|
|
|
|
if (!xive_eas_is_valid(&xive->eat[i])) {
|
|
continue;
|
|
}
|
|
|
|
pq = xive_esb_read(xsrc, i, XIVE_ESB_GET);
|
|
|
|
/*
|
|
* PQ is set to PENDING to possibly catch a triggered
|
|
* interrupt occuring while the VM is stopped (hotplug event
|
|
* for instance) .
|
|
*/
|
|
if (pq != XIVE_ESB_OFF) {
|
|
pq = xive_esb_read(xsrc, i, XIVE_ESB_SET_PQ_10);
|
|
}
|
|
xive_source_esb_set(xsrc, i, pq);
|
|
}
|
|
|
|
/*
|
|
* Sync the XIVE controller in KVM, to flush in-flight event
|
|
* notification that should be enqueued in the EQs and mark the
|
|
* XIVE EQ pages dirty to collect all updates.
|
|
*/
|
|
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_CTRL,
|
|
KVM_DEV_XIVE_EQ_SYNC, NULL, true, &local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
void kvmppc_xive_synchronize_state(SpaprXive *xive, Error **errp)
|
|
{
|
|
assert(xive->fd != -1);
|
|
|
|
/*
|
|
* When the VM is stopped, the sources are masked and the previous
|
|
* state is saved in anticipation of a migration. We should not
|
|
* synchronize the source state in that case else we will override
|
|
* the saved state.
|
|
*/
|
|
if (runstate_is_running()) {
|
|
kvmppc_xive_source_get_state(&xive->source);
|
|
}
|
|
|
|
/* EAT: there is no extra state to query from KVM */
|
|
|
|
/* ENDT */
|
|
kvmppc_xive_get_queues(xive, errp);
|
|
}
|
|
|
|
/*
|
|
* The SpaprXive 'pre_save' method is called by the vmstate handler of
|
|
* the SpaprXive model, after the XIVE controller is synced in the VM
|
|
* change handler.
|
|
*/
|
|
int kvmppc_xive_pre_save(SpaprXive *xive)
|
|
{
|
|
Error *local_err = NULL;
|
|
int ret;
|
|
|
|
assert(xive->fd != -1);
|
|
|
|
/* EAT: there is no extra state to query from KVM */
|
|
|
|
/* ENDT */
|
|
ret = kvmppc_xive_get_queues(xive, &local_err);
|
|
if (ret < 0) {
|
|
error_report_err(local_err);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The SpaprXive 'post_load' method is not called by a vmstate
|
|
* handler. It is called at the sPAPR machine level at the end of the
|
|
* migration sequence by the sPAPR IRQ backend 'post_load' method,
|
|
* when all XIVE states have been transferred and loaded.
|
|
*/
|
|
int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
|
|
{
|
|
Error *local_err = NULL;
|
|
CPUState *cs;
|
|
int i;
|
|
int ret;
|
|
|
|
/* The KVM XIVE device should be in use */
|
|
assert(xive->fd != -1);
|
|
|
|
/* Restore the ENDT first. The targetting depends on it. */
|
|
for (i = 0; i < xive->nr_ends; i++) {
|
|
if (!xive_end_is_valid(&xive->endt[i])) {
|
|
continue;
|
|
}
|
|
|
|
ret = kvmppc_xive_set_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
|
|
&xive->endt[i], &local_err);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* Restore the EAT */
|
|
for (i = 0; i < xive->nr_irqs; i++) {
|
|
if (!xive_eas_is_valid(&xive->eat[i])) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We can only restore the source config if the source has been
|
|
* previously set in KVM. Since we don't do that for all interrupts
|
|
* at reset time anymore, let's do it now.
|
|
*/
|
|
ret = kvmppc_xive_source_reset_one(&xive->source, i, &local_err);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = kvmppc_xive_set_source_config(xive, i, &xive->eat[i], &local_err);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restore the thread interrupt contexts of initial CPUs.
|
|
*
|
|
* The context of hotplugged CPUs is restored later, by the
|
|
* 'post_load' handler of the XiveTCTX model because they are not
|
|
* available at the time the SpaprXive 'post_load' method is
|
|
* called. We can not restore the context of all CPUs in the
|
|
* 'post_load' handler of XiveTCTX because the machine is not
|
|
* necessarily connected to the KVM device at that time.
|
|
*/
|
|
CPU_FOREACH(cs) {
|
|
PowerPCCPU *cpu = POWERPC_CPU(cs);
|
|
|
|
ret = kvmppc_xive_cpu_set_state(spapr_cpu_state(cpu)->tctx, &local_err);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* The source states will be restored when the machine starts running */
|
|
return 0;
|
|
|
|
fail:
|
|
error_report_err(local_err);
|
|
return ret;
|
|
}
|
|
|
|
/* Returns MAP_FAILED on error and sets errno */
|
|
static void *kvmppc_xive_mmap(SpaprXive *xive, int pgoff, size_t len,
|
|
Error **errp)
|
|
{
|
|
void *addr;
|
|
uint32_t page_shift = 16; /* TODO: fix page_shift */
|
|
|
|
addr = mmap(NULL, len, PROT_WRITE | PROT_READ, MAP_SHARED, xive->fd,
|
|
pgoff << page_shift);
|
|
if (addr == MAP_FAILED) {
|
|
error_setg_errno(errp, errno, "XIVE: unable to set memory mapping");
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
|
|
/*
|
|
* All the XIVE memory regions are now backed by mappings from the KVM
|
|
* XIVE device.
|
|
*/
|
|
int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
|
|
Error **errp)
|
|
{
|
|
SpaprXive *xive = SPAPR_XIVE(intc);
|
|
XiveSource *xsrc = &xive->source;
|
|
size_t esb_len = xive_source_esb_len(xsrc);
|
|
size_t tima_len = 4ull << TM_SHIFT;
|
|
CPUState *cs;
|
|
int fd;
|
|
void *addr;
|
|
int ret;
|
|
|
|
/*
|
|
* The KVM XIVE device already in use. This is the case when
|
|
* rebooting under the XIVE-only interrupt mode.
|
|
*/
|
|
if (xive->fd != -1) {
|
|
return 0;
|
|
}
|
|
|
|
if (!kvmppc_has_cap_xive()) {
|
|
error_setg(errp, "IRQ_XIVE capability must be present for KVM");
|
|
return -1;
|
|
}
|
|
|
|
/* First, create the KVM XIVE device */
|
|
fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
|
|
if (fd < 0) {
|
|
error_setg_errno(errp, -fd, "XIVE: error creating KVM device");
|
|
return -1;
|
|
}
|
|
xive->fd = fd;
|
|
|
|
/* Tell KVM about the # of VCPUs we may have */
|
|
if (kvm_device_check_attr(xive->fd, KVM_DEV_XIVE_GRP_CTRL,
|
|
KVM_DEV_XIVE_NR_SERVERS)) {
|
|
ret = kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_CTRL,
|
|
KVM_DEV_XIVE_NR_SERVERS, &nr_servers, true,
|
|
errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 1. Source ESB pages - KVM mapping
|
|
*/
|
|
addr = kvmppc_xive_mmap(xive, KVM_XIVE_ESB_PAGE_OFFSET, esb_len, errp);
|
|
if (addr == MAP_FAILED) {
|
|
goto fail;
|
|
}
|
|
xsrc->esb_mmap = addr;
|
|
|
|
memory_region_init_ram_device_ptr(&xsrc->esb_mmio_kvm, OBJECT(xsrc),
|
|
"xive.esb-kvm", esb_len, xsrc->esb_mmap);
|
|
memory_region_add_subregion_overlap(&xsrc->esb_mmio, 0,
|
|
&xsrc->esb_mmio_kvm, 1);
|
|
|
|
/*
|
|
* 2. END ESB pages (No KVM support yet)
|
|
*/
|
|
|
|
/*
|
|
* 3. TIMA pages - KVM mapping
|
|
*/
|
|
addr = kvmppc_xive_mmap(xive, KVM_XIVE_TIMA_PAGE_OFFSET, tima_len, errp);
|
|
if (addr == MAP_FAILED) {
|
|
goto fail;
|
|
}
|
|
xive->tm_mmap = addr;
|
|
|
|
memory_region_init_ram_device_ptr(&xive->tm_mmio_kvm, OBJECT(xive),
|
|
"xive.tima", tima_len, xive->tm_mmap);
|
|
memory_region_add_subregion_overlap(&xive->tm_mmio, 0,
|
|
&xive->tm_mmio_kvm, 1);
|
|
|
|
xive->change = qemu_add_vm_change_state_handler(
|
|
kvmppc_xive_change_state_handler, xive);
|
|
|
|
/* Connect the presenters to the initial VCPUs of the machine */
|
|
CPU_FOREACH(cs) {
|
|
PowerPCCPU *cpu = POWERPC_CPU(cs);
|
|
|
|
ret = kvmppc_xive_cpu_connect(spapr_cpu_state(cpu)->tctx, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* Update the KVM sources */
|
|
ret = kvmppc_xive_source_reset(xsrc, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
kvm_kernel_irqchip = true;
|
|
kvm_msi_via_irqfd_allowed = true;
|
|
kvm_gsi_direct_mapping = true;
|
|
return 0;
|
|
|
|
fail:
|
|
kvmppc_xive_disconnect(intc);
|
|
return -1;
|
|
}
|
|
|
|
void kvmppc_xive_disconnect(SpaprInterruptController *intc)
|
|
{
|
|
SpaprXive *xive = SPAPR_XIVE(intc);
|
|
XiveSource *xsrc;
|
|
size_t esb_len;
|
|
|
|
assert(xive->fd != -1);
|
|
|
|
/* Clear the KVM mapping */
|
|
xsrc = &xive->source;
|
|
esb_len = xive_source_esb_len(xsrc);
|
|
|
|
if (xsrc->esb_mmap) {
|
|
memory_region_del_subregion(&xsrc->esb_mmio, &xsrc->esb_mmio_kvm);
|
|
object_unparent(OBJECT(&xsrc->esb_mmio_kvm));
|
|
munmap(xsrc->esb_mmap, esb_len);
|
|
xsrc->esb_mmap = NULL;
|
|
}
|
|
|
|
if (xive->tm_mmap) {
|
|
memory_region_del_subregion(&xive->tm_mmio, &xive->tm_mmio_kvm);
|
|
object_unparent(OBJECT(&xive->tm_mmio_kvm));
|
|
munmap(xive->tm_mmap, 4ull << TM_SHIFT);
|
|
xive->tm_mmap = NULL;
|
|
}
|
|
|
|
/*
|
|
* When the KVM device fd is closed, the KVM device is destroyed
|
|
* and removed from the list of devices of the VM. The VCPU
|
|
* presenters are also detached from the device.
|
|
*/
|
|
close(xive->fd);
|
|
xive->fd = -1;
|
|
|
|
kvm_kernel_irqchip = false;
|
|
kvm_msi_via_irqfd_allowed = false;
|
|
kvm_gsi_direct_mapping = false;
|
|
|
|
/* Clear the local list of presenter (hotplug) */
|
|
kvm_cpu_disable_all();
|
|
|
|
/* VM Change state handler is not needed anymore */
|
|
if (xive->change) {
|
|
qemu_del_vm_change_state_handler(xive->change);
|
|
xive->change = NULL;
|
|
}
|
|
}
|