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[Qemu-devel] [RFC v4 04/16] kvm: add kvm_arm_get_max_vm_phys_shift
From: |
Eric Auger |
Subject: |
[Qemu-devel] [RFC v4 04/16] kvm: add kvm_arm_get_max_vm_phys_shift |
Date: |
Thu, 18 Oct 2018 16:30:30 +0200 |
Add the kvm_arm_get_max_vm_phys_shift() helper that returns the
log of the maximum IPA size supported by KVM. This capability
needs to be known to create the VM with a specific IPA max size
(kvm_type passed along KVM_CREATE_VM ioctl.
Signed-off-by: Eric Auger <address@hidden>
---
v3 -> v4:
- s/s/ms in kvm_arm_get_max_vm_phys_shift function comment
- check KVM_CAP_ARM_VM_IPA_SIZE extension
v1 -> v2:
- put this in ARM specific code
---
target/arm/kvm.c | 8 ++++++++
target/arm/kvm_arm.h | 16 ++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 54ef5f711b..485e3291ae 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -18,6 +18,7 @@
#include "qemu/error-report.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
+#include "sysemu/kvm_int.h"
#include "kvm_arm.h"
#include "cpu.h"
#include "trace.h"
@@ -154,6 +155,13 @@ void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
env->features = arm_host_cpu_features.features;
}
+int kvm_arm_get_max_vm_phys_shift(MachineState *ms)
+{
+ KVMState *s = KVM_STATE(ms->accelerator);
+
+ return kvm_check_extension(s, KVM_CAP_ARM_VM_IPA_SIZE);
+}
+
int kvm_arch_init(MachineState *ms, KVMState *s)
{
/* For ARM interrupt delivery is always asynchronous,
diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 5948e8b560..749c38cb35 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -182,6 +182,17 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures
*ahcf);
*/
void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu);
+/**
+ * kvm_arm_get_max_vm_phys_shift - Returns log2 of the max IPA size
+ * supported by KVM
+ *
+ * @ms: Machine state handle
+ *
+ * Return the max number of IPA bits or a negative value if
+ * the host kernel does not expose this value.
+ */
+int kvm_arm_get_max_vm_phys_shift(MachineState *ms);
+
/**
* kvm_arm_sync_mpstate_to_kvm
* @cpu: ARMCPU
@@ -214,6 +225,11 @@ static inline void
kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
cpu->host_cpu_probe_failed = true;
}
+static inline int kvm_arm_get_max_vm_phys_shift(MachineState *ms)
+{
+ return -ENOENT;
+}
+
static inline int kvm_arm_vgic_probe(void)
{
return 0;
--
2.17.1
- [Qemu-devel] [RFC v4 00/16] ARM virt: PCDIMM/NVDIMM at 2TB, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 01/16] hw/arm/boot: introduce fdt_add_memory_node helper, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 02/16] linux-headers: header update for KVM/ARM KVM_ARM_GET_MAX_VM_PHYS_SHIFT, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 06/16] hw/arm/virt: Add virt-3.2 machine type, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 03/16] hw/boards: Add a MachineState parameter to kvm_type callback, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 04/16] kvm: add kvm_arm_get_max_vm_phys_shift,
Eric Auger <=
- [Qemu-devel] [RFC v4 05/16] vl: Set machine ram_size, maxram_size and ram_slots earlier, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 08/16] hw/arm/virt: Allocate device_memory, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 07/16] hw/arm/virt: Implement kvm_type function for 3.2 machine, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 09/16] hw/arm/virt: Add memory hotplug framework, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 10/16] hw/arm/boot: Expose the PC-DIMM nodes in the DT, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 12/16] hw/arm/virt-acpi-build: Add PC-DIMM in SRAT, Eric Auger, 2018/10/18
- [Qemu-devel] [RFC v4 11/16] acpi: move build_srat_hotpluggable_memory to generic ACPI source, Eric Auger, 2018/10/18