Whilst ARM neither needs or wants a complete x86 legacy ioport emulation,
the 8250 is a useful alternative to virtio-console, so carve out 64k at the
bottom of our virtual memory map where we can add ioports if we choose.
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
---
tools/kvm/arm/include/arm-common/kvm-arch.h | 12 ++++++++++--
tools/kvm/arm/kvm-cpu.c | 9 +++++++--
2 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/tools/kvm/arm/include/arm-common/kvm-arch.h b/tools/kvm/arm/include/arm-common/kvm-arch.h
index 7860e17..03ead5b 100644
--- a/tools/kvm/arm/include/arm-common/kvm-arch.h
+++ b/tools/kvm/arm/include/arm-common/kvm-arch.h
@@ -5,7 +5,8 @@
#include <linux/const.h>
#include <linux/types.h>
-#define ARM_MMIO_AREA _AC(0x0000000000000000, UL)
+#define ARM_IOPORT_AREA _AC(0x0000000000000000, UL)
+#define ARM_MMIO_AREA _AC(0x0000000000010000, UL)
#define ARM_AXI_AREA _AC(0x0000000040000000, UL)
#define ARM_MEMORY_AREA _AC(0x0000000080000000, UL)
@@ -16,7 +17,8 @@
#define ARM_GIC_CPUI_BASE (ARM_GIC_DIST_BASE - ARM_GIC_CPUI_SIZE)
#define ARM_GIC_SIZE (ARM_GIC_DIST_SIZE + ARM_GIC_CPUI_SIZE)
-#define ARM_VIRTIO_MMIO_SIZE (ARM_AXI_AREA - ARM_GIC_SIZE)
+#define ARM_IOPORT_SIZE (ARM_MMIO_AREA - ARM_IOPORT_AREA)
+#define ARM_VIRTIO_MMIO_SIZE (ARM_AXI_AREA - (ARM_MMIO_AREA + ARM_GIC_SIZE))
#define ARM_PCI_MMIO_SIZE (ARM_MEMORY_AREA - ARM_AXI_AREA)
#define KVM_PCI_MMIO_AREA ARM_AXI_AREA
@@ -24,6 +26,12 @@
#define VIRTIO_DEFAULT_TRANS VIRTIO_MMIO
+static inline bool arm_addr_in_ioport_region(u64 phys_addr)
+{
+ u64 limit = ARM_IOPORT_AREA + ARM_IOPORT_SIZE;
+ return phys_addr >= ARM_IOPORT_AREA && phys_addr < limit;
+}
+
static inline bool arm_addr_in_virtio_mmio_region(u64 phys_addr)
{
u64 limit = KVM_VIRTIO_MMIO_AREA + ARM_VIRTIO_MMIO_SIZE;
diff --git a/tools/kvm/arm/kvm-cpu.c b/tools/kvm/arm/kvm-cpu.c
index 6d4f306..d31e7b1 100644
--- a/tools/kvm/arm/kvm-cpu.c
+++ b/tools/kvm/arm/kvm-cpu.c
@@ -101,10 +101,15 @@ bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu)
bool kvm_cpu__emulate_mmio(struct kvm *kvm, u64 phys_addr, u8 *data, u32 len,
u8 is_write)
{
- if (arm_addr_in_virtio_mmio_region(phys_addr))
+ if (arm_addr_in_virtio_mmio_region(phys_addr)) {
return kvm__emulate_mmio(kvm, phys_addr, data, len, is_write);
- else if (arm_addr_in_pci_mmio_region(phys_addr))
+ } else if (arm_addr_in_ioport_region(phys_addr)) {
+ int direction = is_write ? KVM_EXIT_IO_OUT : KVM_EXIT_IO_IN;
+ u16 port = phys_addr & USHRT_MAX;
+ return kvm__emulate_io(kvm, port, data, direction, len, 1);
+ } else if (arm_addr_in_pci_mmio_region(phys_addr)) {
die("PCI emulation not supported on ARM!");
+ }
return false;
}
--
1.8.0
--
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