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authorRusty Russell <rusty@rustcorp.com.au>2013-09-05 17:45:54 +0930
committerRusty Russell <rusty@rustcorp.com.au>2013-09-06 08:09:28 +0930
commitaa96a3c686b001a651c86dcb5b0b73d1a9b1d1ca (patch)
tree3c658a20233561d7942c1007ece4aa1ca7e61db2 /arch/x86/lguest
parent98fb4e5e6b100a247ce2dbf2d1699726fdcdef20 (diff)
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 <rusty@rustcorp.com.au>
Diffstat (limited to 'arch/x86/lguest')
-rw-r--r--arch/x86/lguest/boot.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 7c1fde50ecb0..bdf8532494fe 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -1056,6 +1056,12 @@ static void lguest_load_sp0(struct tss_struct *tss,
}
/* 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 @@ __init void lguest_init(void)
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;

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