On IO memory abort, try to handle the MMIO access thorugh the KVM
registered read/write callbacks. This is done by invoking the relevant
kvm_io_bus_* API.
Signed-off-by: Nikolay Nikolaev <n.nikolaev@xxxxxxxxxxxxxxxxxxxxxx>
---
arch/arm/kvm/mmio.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/arch/arm/kvm/mmio.c b/arch/arm/kvm/mmio.c
index 4cb5a93..e42469f 100644
--- a/arch/arm/kvm/mmio.c
+++ b/arch/arm/kvm/mmio.c
@@ -162,6 +162,36 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
return 0;
}
+/**
+ * handle_kernel_mmio - handle an in-kernel MMIO access
+ * @vcpu: pointer to the vcpu performing the access
+ * @run: pointer to the kvm_run structure
+ * @mmio: pointer to the data describing the access
+ *
+ * returns true if the MMIO access has been performed in kernel space,
+ * and false if it needs to be emulated in user space.
+ */
+static bool handle_kernel_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_exit_mmio *mmio)
+{
+ int ret;
+
+ if (mmio->is_write) {
+ ret = kvm_io_bus_write(vcpu, KVM_MMIO_BUS, mmio->phys_addr,
+ mmio->len, &mmio->data);
+
+ } else {
+ ret = kvm_io_bus_read(vcpu, KVM_MMIO_BUS, mmio->phys_addr,
+ mmio->len, &mmio->data);
+ }
+ if (!ret) {
+ kvm_prepare_mmio(run, mmio);
+ kvm_handle_mmio_return(vcpu, run);
+ }
+
+ return !ret;
+}
+
int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
phys_addr_t fault_ipa)
{
@@ -200,6 +230,9 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
if (vgic_handle_mmio(vcpu, run, &mmio))
return 1;
+ if (handle_kernel_mmio(vcpu, run, &mmio))
+ return 1;
+
kvm_prepare_mmio(run, &mmio);
return 0;
}
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
