Michal Ludvig wrote:
Hi again, just wanted to let you know that I still get this Oops with
kvm-68. It comes a bit later, not during the boot but after the XP
desktop comes up. As there were some changes in kernel/x86_emulate.c
the patch you provided for kvm-66 can't be applied anymore.
loaded kvm module (kvm-68)
kvm: emulating exchange as write
Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
[<ffffffff88373b4a>] :kvm:x86_emulate_insn+0x3fa/0x4240
Please apply the attached patch, and post 'dmesg | grep writeback'.
--
error compiling committee.c: too many arguments to function
diff --git a/kernel/x86_emulate.c b/kernel/x86_emulate.c
index f2a696d..7f5a99f 100644
--- a/kernel/x86_emulate.c
+++ b/kernel/x86_emulate.c
@@ -1202,6 +1202,13 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
switch (c->dst.type) {
case OP_REG:
+
+ if (!c->dst.ptr) {
+ printk("writeback: b %02x mordm %02x\n",
+ c->b, c->modrm);
+ return 0;
+ }
+
/* The 4-byte case *is* correct:
* in 64-bit mode we zero-extend.
*/
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