From 38afd772f802ff787ea16af73b0c0d24a8c46b6c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Date: Mon, 13 May 2019 10:42:33 +0200 Subject: spapr/xive: add KVM support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This introduces a set of helpers when KVM is in use, which create the KVM XIVE device, initialize the interrupt sources at a KVM level and connect the interrupt presenters to the vCPU. They also handle the initialization of the TIMA and the source ESB memory regions of the controller. These have a different type under KVM. They are 'ram device' memory mappings, similarly to VFIO, exposed to the guest and the associated VMAs on the host are populated dynamically with the appropriate pages using a fault handler. Signed-off-by: Cédric Le Goater Reviewed-by: David Gibson Message-Id: <20190513084245.25755-3-clg@kaod.org> Signed-off-by: David Gibson --- hw/intc/spapr_xive.c | 48 ++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 6 deletions(-) (limited to 'hw/intc/spapr_xive.c') diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c index 62e13ac353..27632683e6 100644 --- a/hw/intc/spapr_xive.c +++ b/hw/intc/spapr_xive.c @@ -174,7 +174,7 @@ void spapr_xive_pic_print_info(SpaprXive *xive, Monitor *mon) } } -static void spapr_xive_map_mmio(SpaprXive *xive) +void spapr_xive_map_mmio(SpaprXive *xive) { sysbus_mmio_map(SYS_BUS_DEVICE(xive), 0, xive->vc_base); sysbus_mmio_map(SYS_BUS_DEVICE(xive), 1, xive->end_base); @@ -251,6 +251,9 @@ static void spapr_xive_instance_init(Object *obj) object_initialize_child(obj, "end_source", &xive->end_source, sizeof(xive->end_source), TYPE_XIVE_END_SOURCE, &error_abort, NULL); + + /* Not connected to the KVM XIVE device */ + xive->fd = -1; } static void spapr_xive_realize(DeviceState *dev, Error **errp) @@ -259,6 +262,7 @@ static void spapr_xive_realize(DeviceState *dev, Error **errp) XiveSource *xsrc = &xive->source; XiveENDSource *end_xsrc = &xive->end_source; Error *local_err = NULL; + MachineState *machine = MACHINE(qdev_get_machine()); if (!xive->nr_irqs) { error_setg(errp, "Number of interrupt needs to be greater 0"); @@ -305,6 +309,32 @@ static void spapr_xive_realize(DeviceState *dev, Error **errp) xive->eat = g_new0(XiveEAS, xive->nr_irqs); xive->endt = g_new0(XiveEND, xive->nr_ends); + xive->nodename = g_strdup_printf("interrupt-controller@%" PRIx64, + xive->tm_base + XIVE_TM_USER_PAGE * (1 << TM_SHIFT)); + + qemu_register_reset(spapr_xive_reset, dev); + + if (kvm_enabled() && machine_kernel_irqchip_allowed(machine)) { + kvmppc_xive_connect(xive, &local_err); + if (local_err && machine_kernel_irqchip_required(machine)) { + error_prepend(&local_err, + "kernel_irqchip requested but unavailable: "); + error_propagate(errp, local_err); + return; + } + + if (!local_err) { + return; + } + + /* + * We failed to initialize the XIVE KVM device, fallback to + * emulated mode + */ + error_prepend(&local_err, "kernel_irqchip allowed but unavailable: "); + warn_report_err(local_err); + } + /* TIMA initialization */ memory_region_init_io(&xive->tm_mmio, OBJECT(xive), &xive_tm_ops, xive, "xive.tima", 4ull << TM_SHIFT); @@ -316,11 +346,6 @@ static void spapr_xive_realize(DeviceState *dev, Error **errp) /* Map all regions */ spapr_xive_map_mmio(xive); - - xive->nodename = g_strdup_printf("interrupt-controller@%" PRIx64, - xive->tm_base + XIVE_TM_USER_PAGE * (1 << TM_SHIFT)); - - qemu_register_reset(spapr_xive_reset, dev); } static int spapr_xive_get_eas(XiveRouter *xrtr, uint8_t eas_blk, @@ -495,6 +520,17 @@ bool spapr_xive_irq_claim(SpaprXive *xive, uint32_t lisn, bool lsi) if (lsi) { xive_source_irq_set_lsi(xsrc, lisn); } + + if (kvm_irqchip_in_kernel()) { + Error *local_err = NULL; + + kvmppc_xive_source_reset_one(xsrc, lisn, &local_err); + if (local_err) { + error_report_err(local_err); + return false; + } + } + return true; } -- cgit v1.2.3