2 files changed, 24 insertions, 0 deletions

diff --git a/lib/libvmmapi/vmmapi.c b/lib/libvmmapi/vmmapi.c
index 7347c41dd311..3a791908427d 100644
--- a/lib/libvmmapi/vmmapi.c
+++ b/lib/libvmmapi/vmmapi.c
@@ -799,6 +799,25 @@ vm_ioapic_pincount(struct vmctx *ctx, int *pincount)
 }
 
 int
+vm_readwrite_kernemu_device(struct vmctx *ctx, int vcpu, vm_paddr_t gpa,
+    bool write, int size, uint64_t *value)
+{
+	struct vm_readwrite_kernemu_device irp = {
+		.vcpuid = vcpu,
+		.access_width = fls(size) - 1,
+		.gpa = gpa,
+		.value = write ? *value : ~0ul,
+	};
+	long cmd = (write ? VM_SET_KERNEMU_DEV : VM_GET_KERNEMU_DEV);
+	int rc;
+
+	rc = ioctl(ctx->fd, cmd, &irp);
+	if (rc == 0 && !write)
+		*value = irp.value;
+	return (rc);
+}
+
+int
 vm_isa_assert_irq(struct vmctx *ctx, int atpic_irq, int ioapic_irq)
 {
 	struct vm_isa_irq isa_irq;
@@ -1615,6 +1634,7 @@ vm_get_ioctls(size_t *len)
 	    VM_MMAP_GETNEXT, VM_SET_REGISTER, VM_GET_REGISTER,
 	    VM_SET_SEGMENT_DESCRIPTOR, VM_GET_SEGMENT_DESCRIPTOR,
 	    VM_SET_REGISTER_SET, VM_GET_REGISTER_SET,
+	    VM_SET_KERNEMU_DEV, VM_GET_KERNEMU_DEV,
 	    VM_INJECT_EXCEPTION, VM_LAPIC_IRQ, VM_LAPIC_LOCAL_IRQ,
 	    VM_LAPIC_MSI, VM_IOAPIC_ASSERT_IRQ, VM_IOAPIC_DEASSERT_IRQ,
 	    VM_IOAPIC_PULSE_IRQ, VM_IOAPIC_PINCOUNT, VM_ISA_ASSERT_IRQ,
diff --git a/lib/libvmmapi/vmmapi.h b/lib/libvmmapi/vmmapi.h
index 2b026031b50f..86a58280f34a 100644
--- a/lib/libvmmapi/vmmapi.h
+++ b/lib/libvmmapi/vmmapi.h
@@ -35,6 +35,8 @@
 #include <sys/cpuset.h>
 #include <machine/vmm_dev.h>
 
+#include <stdbool.h>
+
 /*
  * API version for out-of-tree consumers like grub-bhyve for making compile
  * time decisions.
@@ -156,6 +158,8 @@ int	vm_ioapic_assert_irq(struct vmctx *ctx, int irq);
 int	vm_ioapic_deassert_irq(struct vmctx *ctx, int irq);
 int	vm_ioapic_pulse_irq(struct vmctx *ctx, int irq);
 int	vm_ioapic_pincount(struct vmctx *ctx, int *pincount);
+int	vm_readwrite_kernemu_device(struct vmctx *ctx, int vcpu,
+	    vm_paddr_t gpa, bool write, int size, uint64_t *value);
 int	vm_isa_assert_irq(struct vmctx *ctx, int atpic_irq, int ioapic_irq);
 int	vm_isa_deassert_irq(struct vmctx *ctx, int atpic_irq, int ioapic_irq);
 int	vm_isa_pulse_irq(struct vmctx *ctx, int atpic_irq, int ioapic_irq);