lguest: fix GPF in guest when using gdb.
Since the Guest is in ring 1, it can't read the debug registers: doing
so gives a number of nasty messages:
(gdb) run
Starting program: /bin/sleep
[ 31.170230] general protection fault: 0000 [#1] SMP
[ 31.170230] Modules linked in:
[ 31.170230] CPU: 0 PID: 2678 Comm: sleep Not tainted 3.11.0+ #64
[ 31.170230] task: cc5c09b0 ti: cc79c000 task.ti: cc79c000
[ 31.170230] EIP: 0061:[<c01333d8>] EFLAGS: 00000097 CPU: 0
[ 31.170230] EIP is at native_get_debugreg+0x58/0x70
[ 31.170230] EAX: 00000006 EBX: cc79dfb4 ECX: b7fff918 EDX: 00000000
[ 31.170230] ESI: cc5c09b0 EDI: 00000000 EBP: cc79df84 ESP: cc79df84
[ 31.170230] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
[ 31.170230] CR0: 00000008 CR2: 081ba69a CR3: 0e2f2000 CR4: 00000000
Signed-off-by: Rusty Russell <[email protected]>
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 7c1fde5..bdf8532 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -1056,6 +1056,12 @@
}
/* Let's just say, I wouldn't do debugging under a Guest. */
+static unsigned long lguest_get_debugreg(int regno)
+{
+ /* FIXME: Implement */
+ return 0;
+}
+
static void lguest_set_debugreg(int regno, unsigned long value)
{
/* FIXME: Implement */
@@ -1303,6 +1309,7 @@
pv_cpu_ops.load_tr_desc = lguest_load_tr_desc;
pv_cpu_ops.set_ldt = lguest_set_ldt;
pv_cpu_ops.load_tls = lguest_load_tls;
+ pv_cpu_ops.get_debugreg = lguest_get_debugreg;
pv_cpu_ops.set_debugreg = lguest_set_debugreg;
pv_cpu_ops.clts = lguest_clts;
pv_cpu_ops.read_cr0 = lguest_read_cr0;
