Instead, of trying out each and every target type we should
use KVM_ARM_PREFERRED_TARGET vm ioctl to determine target type
for KVM ARM/ARM64.
If KVM_ARM_PREFERRED_TARGET vm ioctl fails then we fallback to
old method of trying all known target types.
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx>
Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxx>
---
tools/kvm/arm/kvm-cpu.c | 46 +++++++++++++++++++++++++++++++++++-----------
1 file changed, 35 insertions(+), 11 deletions(-)
diff --git a/tools/kvm/arm/kvm-cpu.c b/tools/kvm/arm/kvm-cpu.c
index aeaa4cf..c010e9c 100644
--- a/tools/kvm/arm/kvm-cpu.c
+++ b/tools/kvm/arm/kvm-cpu.c
@@ -34,6 +34,7 @@ struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
struct kvm_cpu *vcpu;
int coalesced_offset, mmap_size, err = -1;
unsigned int i;
+ struct kvm_vcpu_init preferred_init;
struct kvm_vcpu_init vcpu_init = {
.features = ARM_VCPU_FEATURE_FLAGS(kvm, cpu_id)
};
@@ -55,20 +56,42 @@ struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
if (vcpu->kvm_run == MAP_FAILED)
die("unable to mmap vcpu fd");
- /* Find an appropriate target CPU type. */
- for (i = 0; i < ARRAY_SIZE(kvm_arm_targets); ++i) {
- if (!kvm_arm_targets[i])
- continue;
- target = kvm_arm_targets[i];
- vcpu_init.target = target->id;
+ /*
+ * If preferred target ioctl successful then use preferred target
+ * else try each and every target type.
+ */
+ err = ioctl(kvm->vm_fd, KVM_ARM_PREFERRED_TARGET, &preferred_init);
+ if (!err) {
+ /* Match preferred target CPU type. */
+ target = NULL;
+ for (i = 0; i < ARRAY_SIZE(kvm_arm_targets); ++i) {
+ if (!kvm_arm_targets[i])
+ continue;
+ if (kvm_arm_targets[i]->id == preferred_init.target) {
+ target = kvm_arm_targets[i];
+ break;
+ }
+ }
+
+ vcpu_init.target = preferred_init.target;
err = ioctl(vcpu->vcpu_fd, KVM_ARM_VCPU_INIT, &vcpu_init);
- if (!err)
- break;
+ if (err || target->init(vcpu))
+ die("Unable to initialise vcpu for preferred target");
+ } else {
+ /* Find an appropriate target CPU type. */
+ for (i = 0; i < ARRAY_SIZE(kvm_arm_targets); ++i) {
+ if (!kvm_arm_targets[i])
+ continue;
+ target = kvm_arm_targets[i];
+ vcpu_init.target = target->id;
+ err = ioctl(vcpu->vcpu_fd, KVM_ARM_VCPU_INIT, &vcpu_init);
+ if (!err)
+ break;
+ }
+ if (err || target->init(vcpu))
+ die("Unable to initialise vcpu");
}
- if (err || target->init(vcpu))
- die("Unable to initialise ARM vcpu");
-
coalesced_offset = ioctl(kvm->sys_fd, KVM_CHECK_EXTENSION,
KVM_CAP_COALESCED_MMIO);
if (coalesced_offset)
@@ -81,6 +104,7 @@ struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
vcpu->cpu_type = target->id;
vcpu->cpu_compatible = target->compatible;
vcpu->is_running = true;
+
return vcpu;
}
--
1.7.9.5
--
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