From 4b280b726a329a97db03323d8d03ed554f7872b8 Mon Sep 17 00:00:00 2001 From: Andrew Jones Date: Tue, 27 Oct 2015 12:00:50 +0000 Subject: [PATCH] hw/arm/virt: don't use a15memmap directly We should always go through VirtBoardInfo when we need the memmap. To avoid using a15memmap directly, in this case, we need to defer the max-cpus check from class init time to instance init time. In class init we now use MAX_CPUMASK_BITS for max_cpus initialization, which is the maximum QEMU supports, and also, incidentally, the maximum KVM/gicv3 currently supports. Also, a nice side-effect of delaying the max-cpus check is that we now get more appropriate error messages for gicv2 machines that try to configure more than 123 cpus. Before this patch it would complain that the requested number of cpus was greater than 123, but for gicv2 configs, it should complain that the number is greater than 8. Signed-off-by: Andrew Jones Message-id: 1445189728-860-3-git-send-email-drjones@redhat.com Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- hw/arm/virt.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 5d38c47444..77d9267599 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -923,7 +923,7 @@ static void machvirt_init(MachineState *machine) qemu_irq pic[NUM_IRQS]; MemoryRegion *sysmem = get_system_memory(); int gic_version = vms->gic_version; - int n; + int n, max_cpus; MemoryRegion *ram = g_new(MemoryRegion, 1); const char *cpu_model = machine->cpu_model; VirtBoardInfo *vbi; @@ -957,6 +957,22 @@ static void machvirt_init(MachineState *machine) exit(1); } + /* The maximum number of CPUs depends on the GIC version, or on how + * many redistributors we can fit into the memory map. + */ + if (gic_version == 3) { + max_cpus = vbi->memmap[VIRT_GIC_REDIST].size / 0x20000; + } else { + max_cpus = GIC_NCPU; + } + + if (smp_cpus > max_cpus) { + error_report("Number of SMP CPUs requested (%d) exceeds max CPUs " + "supported by machine 'mach-virt' (%d)", + smp_cpus, max_cpus); + exit(1); + } + vbi->smp_cpus = smp_cpus; if (machine->ram_size > vbi->memmap[VIRT_MEM].size) { @@ -1155,10 +1171,11 @@ static void virt_class_init(ObjectClass *oc, void *data) mc->desc = "ARM Virtual Machine", mc->init = machvirt_init; - /* Our maximum number of CPUs depends on how many redistributors - * we can fit into memory map + /* Start max_cpus at the maximum QEMU supports. We'll further restrict + * it later in machvirt_init, where we have more information about the + * configuration of the particular instance. */ - mc->max_cpus = a15memmap[VIRT_GIC_REDIST].size / 0x20000; + mc->max_cpus = MAX_CPUMASK_BITS; mc->has_dynamic_sysbus = true; mc->block_default_type = IF_VIRTIO; mc->no_cdrom = 1;