diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/intc/spapr_xive_kvm.c | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c index 507637d..66bf4c0 100644 --- a/hw/intc/spapr_xive_kvm.c +++ b/hw/intc/spapr_xive_kvm.c @@ -146,13 +146,43 @@ int kvmppc_xive_cpu_synchronize_state(XiveTCTX *tctx, Error **errp) return s.ret; } -static int kvmppc_xive_reset_ipi(SpaprXive *xive, CPUState *cs, Error **errp) +/* + * Allocate the vCPU IPIs from the vCPU context. This will allocate + * the XIVE IPI interrupt on the chip on which the vCPU is running. + * This gives a better distribution of IPIs when the guest has a lot + * of vCPUs. When the vCPUs are pinned, this will make the IPI local + * to the chip of the vCPU. It will reduce rerouting between interrupt + * controllers and gives better performance. + */ +typedef struct { + SpaprXive *xive; + Error *err; + int rc; +} XiveInitIPI; + +static void kvmppc_xive_reset_ipi_on_cpu(CPUState *cs, run_on_cpu_data arg) { unsigned long ipi = kvm_arch_vcpu_id(cs); + XiveInitIPI *s = arg.host_ptr; uint64_t state = 0; - return kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE, ipi, - &state, true, errp); + s->rc = kvm_device_access(s->xive->fd, KVM_DEV_XIVE_GRP_SOURCE, ipi, + &state, true, &s->err); +} + +static int kvmppc_xive_reset_ipi(SpaprXive *xive, CPUState *cs, Error **errp) +{ + XiveInitIPI s = { + .xive = xive, + .err = NULL, + .rc = 0, + }; + + run_on_cpu(cs, kvmppc_xive_reset_ipi_on_cpu, RUN_ON_CPU_HOST_PTR(&s)); + if (s.err) { + error_propagate(errp, s.err); + } + return s.rc; } int kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp) |