[Qemu-devel] new kqemu win98 hack affects FreeBSD

[Qemu-devel] new kqemu win98 hack affects FreeBSD

[Juergen Lock]

Hi!

 I got a report that kqemu doesnt speed up FreeBSD guests anymore,
and found out that the win98 hack stops kqemu from being used.
If i disable it and add this to cpu-exec.c,

Index: cpu-exec.c
@@ -232,6 +232,13 @@
 #ifdef USE_KQEMU
             if (kqemu_is_ok(env) && env->interrupt_request == 0) {
                 int ret;
+#if 1
+		static uint32_t lastldtlimit = 0;
+		if (env->ldt.limit != lastldtlimit) {
+			lastldtlimit = env->ldt.limit;
+			printf("new ldt limit 0x%x\n", (int)lastldtlimit);
+		}
+#endif
                 env->eflags = env->eflags | cc_table[CC_OP].compute_all() | (DF & DF_MASK);
                 ret = kqemu_cpu_exec(env);
                 /* put eflags in CPU temporary format */


then a short run with FreeSBIE gives this:

new ldt limit 0xffff
new ldt limit 0xfff
new ldt limit 0x1fff
new ldt limit 0xfff
new ldt limit 0x1fff
new ldt limit 0xfff
new ldt limit 0x1fff
new ldt limit 0x87
new ldt limit 0x1fff
new ldt limit 0x87
new ldt limit 0x1fff
new ldt limit 0xfff
new ldt limit 0x2fff
new ldt limit 0x87
new ldt limit 0xfff
new ldt limit 0x87
new ldt limit 0xfff
new ldt limit 0x87
new ldt limit 0xfff

 So maybe we need a new switch -win98-hack... :)

	Juergen

Re: [Qemu-devel] new kqemu win98 hack affects FreeBSD

[Paul Brook]

>
>  So maybe we need a new switch -win98-hack... :)

It's spelt -no-kqemu :-)

Paul