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-rw-r--r--arch/arm/kvm/arm.c58
1 files changed, 54 insertions, 4 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 0b0d58a905c4..07e7eb1d7ab6 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -132,6 +132,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
/* Mark the initial VMID generation invalid */
kvm->arch.vmid_gen = 0;
+ /* The maximum number of VCPUs is limited by the host's GIC model */
+ kvm->arch.max_vcpus = kvm_vgic_get_max_vcpus();
+
return ret;
out_free_stage2_pgd:
kvm_free_stage2_pgd(kvm);
@@ -218,6 +221,11 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
goto out;
}
+ if (id >= kvm->arch.max_vcpus) {
+ err = -EINVAL;
+ goto out;
+ }
+
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu) {
err = -ENOMEM;
@@ -241,9 +249,8 @@ out:
return ERR_PTR(err);
}
-int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
- return 0;
}
void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
@@ -777,9 +784,39 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
}
}
+/**
+ * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
+ * @kvm: kvm instance
+ * @log: slot id and address to which we copy the log
+ *
+ * Steps 1-4 below provide general overview of dirty page logging. See
+ * kvm_get_dirty_log_protect() function description for additional details.
+ *
+ * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
+ * always flush the TLB (step 4) even if previous step failed and the dirty
+ * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
+ * does not preclude user space subsequent dirty log read. Flushing TLB ensures
+ * writes will be marked dirty for next log read.
+ *
+ * 1. Take a snapshot of the bit and clear it if needed.
+ * 2. Write protect the corresponding page.
+ * 3. Copy the snapshot to the userspace.
+ * 4. Flush TLB's if needed.
+ */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
- return -EINVAL;
+ bool is_dirty = false;
+ int r;
+
+ mutex_lock(&kvm->slots_lock);
+
+ r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
+
+ if (is_dirty)
+ kvm_flush_remote_tlbs(kvm);
+
+ mutex_unlock(&kvm->slots_lock);
+ return r;
}
static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
@@ -811,7 +848,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
switch (ioctl) {
case KVM_CREATE_IRQCHIP: {
if (vgic_present)
- return kvm_vgic_create(kvm);
+ return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
else
return -ENXIO;
}
@@ -1035,6 +1072,19 @@ static void check_kvm_target_cpu(void *ret)
*(int *)ret = kvm_target_cpu();
}
+struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
+{
+ struct kvm_vcpu *vcpu;
+ int i;
+
+ mpidr &= MPIDR_HWID_BITMASK;
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
+ return vcpu;
+ }
+ return NULL;
+}
+
/**
* Initialize Hyp-mode and memory mappings on all CPUs.
*/