Index: lib/libkvm/kvm.h
===================================================================
--- lib/libkvm/kvm.h
+++ lib/libkvm/kvm.h
@@ -124,6 +124,7 @@
 ssize_t	  kvm_read_zpcpu(kvm_t *, unsigned long, void *, size_t, int);
 ssize_t	  kvm_read2(kvm_t *, kvaddr_t, void *, size_t);
 ssize_t	  kvm_write(kvm_t *, unsigned long, const void *, size_t);
+off_t	  kvm_kerndisp(kvm_t *);
 
 typedef int kvm_walk_pages_cb_t(struct kvm_page *, void *);
 int kvm_walk_pages(kvm_t *, kvm_walk_pages_cb_t *, void *);
Index: lib/libkvm/kvm.c
===================================================================
--- lib/libkvm/kvm.c
+++ lib/libkvm/kvm.c
@@ -46,6 +46,7 @@
 #include <sys/linker.h>
 #include <sys/pcpu.h>
 #include <sys/stat.h>
+#include <sys/sysctl.h>
 #include <sys/mman.h>
 
 #include <net/vnet.h>
@@ -499,3 +500,32 @@
 
 	return (kd->arch->ka_walk_pages(kd, cb, closure));
 }
+
+off_t
+kvm_kerndisp(kvm_t *kd)
+{
+	unsigned long kernbase, rel_kernbase;
+	size_t kernbase_len = sizeof(kernbase);
+	size_t rel_kernbase_len = sizeof(rel_kernbase);
+
+	if (ISALIVE(kd)) {
+		if (sysctlbyname("kern.base_address", &kernbase,
+		    &kernbase_len, NULL, 0) == -1) {
+			_kvm_syserr(kd, kd->program,
+				"failed to get kernel base address");
+			return (0);
+		}
+		if (sysctlbyname("kern.relbase_address", &rel_kernbase,
+		    &rel_kernbase_len, NULL, 0) == -1) {
+			_kvm_syserr(kd, kd->program,
+				"failed to get relocated kernel base address");
+			return (0);
+		}
+		return (rel_kernbase - kernbase);
+	}
+
+	if (kd->arch->ka_kerndisp == NULL)
+		return (0);
+
+	return (kd->arch->ka_kerndisp(kd));
+}
Index: lib/libkvm/kvm_minidump_powerpc64.c
===================================================================
--- lib/libkvm/kvm_minidump_powerpc64.c
+++ lib/libkvm/kvm_minidump_powerpc64.c
@@ -184,6 +184,12 @@
 #endif
 }
 
+static off_t
+_powerpc64_kerndisp(kvm_t *kd)
+{
+	return (kd->vmst->hdr.startkernel - PPC64_KERNBASE);
+}
+
 static int
 _powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
 {
@@ -197,6 +203,7 @@
 	.ka_kvatop	= _powerpc64_minidump_kvatop,
 	.ka_walk_pages	= _powerpc64_minidump_walk_pages,
 	.ka_native	= _powerpc64_native,
+	.ka_kerndisp	= _powerpc64_kerndisp,
 };
 
 KVM_ARCH(kvm_powerpc64_minidump);
Index: lib/libkvm/kvm_private.h
===================================================================
--- lib/libkvm/kvm_private.h
+++ lib/libkvm/kvm_private.h
@@ -47,6 +47,7 @@
 	int	(*ka_kvatop)(kvm_t *, kvaddr_t, off_t *);
 	int	(*ka_native)(kvm_t *);
 	int	(*ka_walk_pages)(kvm_t *, kvm_walk_pages_cb_t *, void *);
+	off_t	(*ka_kerndisp)(kvm_t *);
 };
 
 #define	KVM_ARCH(ka)	DATA_SET(kvm_arch, ka)