Make libkvm work on live systems and crashdumps with and

without VIMAGE virtualization in the kernel.

If we cannot resolve a symbol try to see if we can find it with
prefix of the virtualized subsystem, currently only "vnet_entry"
by identifying either the vnet of the current process for a
live system or the vnet of proc0 (or of dumptid if compiled
in a non-default way).

The way this is done currently allows us to only touch libkvm
but no single application. Once we are going to virtualize more
subsystems we will have to review this decision for better scaling.

Submitted by:	rwatson (initial version of kvm_vnet.c, lots of ideas)
Reviewed by:	rwatson
Approved by:	re (kib)

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/libkvm/kvm_private.h b/lib/libkvm/kvm_private.h
index 88ff716..cc073db 100644
--- a/lib/libkvm/kvm_private.h
+++ b/lib/libkvm/kvm_private.h
@@ -62,6 +62,12 @@ struct __kvm {
 	 */
 	struct vmstate *vmst;
 	int	rawdump;	/* raw dump format */
+
+	int		vnet_initialized;	/* vnet fields set up */
+	uintptr_t	vnet_start;	/* start of kernel's vnet region */
+	uintptr_t	vnet_stop;	/* stop of kernel's vnet region */
+	uintptr_t	vnet_current;	/* vnet we're working with */
+	uintptr_t	vnet_base;	/* vnet base of current vnet */
 };
 
 /*
@@ -74,10 +80,14 @@ void	 _kvm_freevtop(kvm_t *);
 int	 _kvm_initvtop(kvm_t *);
 int	 _kvm_kvatop(kvm_t *, u_long, off_t *);
 void	*_kvm_malloc(kvm_t *kd, size_t);
+int	 _kvm_nlist(kvm_t *, struct nlist *, int);
 void	*_kvm_realloc(kvm_t *kd, void *, size_t);
 void	 _kvm_syserr (kvm_t *kd, const char *program, const char *fmt, ...)
 	    __printflike(3, 4);
 int	 _kvm_uvatop(kvm_t *, const struct proc *, u_long, u_long *);
+int	 _kvm_vnet_selectpid(kvm_t *, pid_t);
+int	 _kvm_vnet_initialized(kvm_t *, int);
+uintptr_t _kvm_vnet_validaddr(kvm_t *, uintptr_t);
 
 #if defined(__amd64__) || defined(__i386__) || defined(__arm__)
 void	 _kvm_minidump_freevtop(kvm_t *);