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 in passed though the KVM_CREATE_VM ioctl and
this allows KVM to set the stage2 tables dynamically.
Signed-off-by: Eric Auger <eric.au...@redhat.com>
---
v6 -> v7:
- Introduce RAMBASE and rename add LEGACY_ prefix in that patch
- use local variables with explicit names in virt_set_memmap:
device_memory_base, device_memory_size
- add an extended_memmap field in the class
v5 -> v6:
- add some comments
- high IO region cannot start before 256GiB
---
hw/arm/virt.c | 50 ++++++++++++++++++++++++++++++++++++++++++-
include/hw/arm/virt.h | 2 ++
2 files changed, 51 insertions(+), 1 deletion(-)
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 9db602457b..ad3a0ad73d 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -1437,7 +1437,14 @@ 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 in kvm_type(),
+ * if set, to create a VM with the right number of IPA bits.
+ */
+
+ if (!mc->kvm_type || !kvm_enabled()) {
+ virt_set_memmap(vms);
+ }
/* We can probe only here because during property set
* KVM is not available yet
@@ -1814,6 +1821,36 @@ 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);
@@ -1838,6 +1875,7 @@ 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;
@@ -1909,6 +1947,12 @@ static void virt_instance_init(Object *obj)
"Valid values are none and smmuv3",
NULL);
+ if (vmc->no_extended_memmap) {
+ vms->extended_memmap = false;
+ } else {
+ vms->extended_memmap = true;
+ }
+
vms->irqmap = a15irqmap;
}
@@ -1939,8 +1983,12 @@ DEFINE_VIRT_MACHINE_AS_LATEST(4, 0)
static void virt_machine_3_1_options(MachineClass *mc)
{
+ VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
virt_machine_4_0_options(mc);
compat_props_add(mc->compat_props, hw_compat_3_1, hw_compat_3_1_len);
+
+ /* extended memory map is enabled from 4.0 onwards */
+ vmc->no_extended_memmap = true;
}
DEFINE_VIRT_MACHINE(3, 1)
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index acad0400d8..7798462cb0 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -106,6 +106,7 @@ typedef struct {
bool claim_edge_triggered_timers;
bool smbios_old_sys_ver;
bool no_highmem_ecam;
+ bool no_extended_memmap;
} VirtMachineClass;
typedef struct {
@@ -135,6 +136,7 @@ typedef struct {
hwaddr highest_gpa;
hwaddr device_memory_base;
hwaddr device_memory_size;
+ bool extended_memmap;
} VirtMachineState;
#define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
--
2.20.1
