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hw/arm/virt: Implement kvm_type function for 4.0 machine

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This patch implements the machine class kvm_type() callback.
It returns the number of bits requested to implement the whole GPA
range including the RAM and IO regions located beyond.
The returned value is passed though the KVM_CREATE_VM ioctl and
this allows KVM to set the stage2 tables dynamically.

To compute the highest GPA used in the memory map, kvm_type()
must freeze the memory map by calling virt_set_memmap().

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-id: 20190304101339.25970-9-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2019-03-04 11:13:37 +01:00 committed by Peter Maydell
parent 957e32cffa
commit c9650222b8
1 changed files with 38 additions and 1 deletions
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39
hw/arm/virt.c
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@ -1440,7 +1440,13 @@ static void machvirt_init(MachineState *machine)
bool firmware_loaded = bios_name || drive_get(IF_PFLASH, 0, 0);
bool aarch64 = true;
virt_set_memmap(vms);
/*
* In accelerated mode, the memory map is computed earlier in kvm_type()
* to create a VM with the right number of IPA bits.
*/
if (!vms->memmap) {
virt_set_memmap(vms);
}
/* We can probe only here because during property set
* KVM is not available yet
@ -1829,6 +1835,36 @@ static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
return NULL;
}
/*
* for arm64 kvm_type [7-0] encodes the requested number of bits
* in the IPA address space
*/
static int virt_kvm_type(MachineState *ms, const char *type_str)
{
VirtMachineState *vms = VIRT_MACHINE(ms);
int max_vm_pa_size = kvm_arm_get_max_vm_ipa_size(ms);
int requested_pa_size;
/* we freeze the memory map to compute the highest gpa */
virt_set_memmap(vms);
requested_pa_size = 64 - clz64(vms->highest_gpa);
if (requested_pa_size > max_vm_pa_size) {
error_report("-m and ,maxmem option values "
"require an IPA range (%d bits) larger than "
"the one supported by the host (%d bits)",
requested_pa_size, max_vm_pa_size);
exit(1);
}
/*
* By default we return 0 which corresponds to an implicit legacy
* 40b IPA setting. Otherwise we return the actual requested PA
* logsize
*/
return requested_pa_size > 40 ? requested_pa_size : 0;
}
static void virt_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@ -1853,6 +1889,7 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
mc->cpu_index_to_instance_props = virt_cpu_index_to_props;
mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-a15");
mc->get_default_cpu_node_id = virt_get_default_cpu_node_id;
mc->kvm_type = virt_kvm_type;
assert(!mc->get_hotplug_handler);
mc->get_hotplug_handler = virt_machine_get_hotplug_handler;
hc->plug = virt_machine_device_plug_cb;