Re: Kernel Oops with kvm 66 running WinXP

[Avi Kivity <avi@qumranet.com>]

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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


[-- Attachment #2: debug-writeback-oops.patch --]
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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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