Am 06.06.2010 um 16:53 schrieb Faidon Liambotis:
> Peter Lieven wrote:
>>>> i was looking for a generic way to disable it in the hypervisor
>>>> without the need to touch every guests kernel commandline.
>>>> this would be easy revertible once its all working as expected.
>>> This is a huge hack but for the same reason I've made an LD_PRELOAD
>>> wrapper that wraps ioctl masking the hsot kernel's kvmclock feature from
>>> userspace kvm. I'll be happy to share it if you're interested.
>>
>> i would be grateful if you can sent it to me offlist.
> http://people.debian.org/~paravoid/kvm-noclock-3.tar.gz
>
>> however, i came up with this hack,
>> that seems to work also:
> <snip>
>
> Yes, that's equivalent. We didn't use that since we wanted to use our
> distribution's binaries and be able to upgrade without modifying the source.
thank you.
i want to share this patch for stable until -cpu xxx,-kvmclock works in the
stable
tree.
diff -ur qemu-kvm-0.12.4.orig/qemu-kvm.c qemu-kvm-0.12.4/qemu-kvm.c
--- qemu-kvm-0.12.4.orig/qemu-kvm.c 2010-05-09 13:05:19.000000000 +0200
+++ qemu-kvm-0.12.4/qemu-kvm.c 2010-06-06 16:58:12.000000000 +0200
@@ -54,7 +54,7 @@
int kvm_pit = 1;
int kvm_pit_reinject = 1;
int kvm_nested = 0;
-
+int kvm_clock = 1;
KVMState *kvm_state;
kvm_context_t kvm_context;
diff -ur qemu-kvm-0.12.4.orig/qemu-kvm.h qemu-kvm-0.12.4/qemu-kvm.h
--- qemu-kvm-0.12.4.orig/qemu-kvm.h 2010-05-09 13:05:19.000000000 +0200
+++ qemu-kvm-0.12.4/qemu-kvm.h 2010-06-06 17:04:02.000000000 +0200
@@ -1035,6 +1035,7 @@
extern int kvm_pit;
extern int kvm_pit_reinject;
extern int kvm_nested;
+extern int kvm_clock;
extern kvm_context_t kvm_context;
struct ioperm_data {
diff -ur qemu-kvm-0.12.4.orig/qemu-kvm-x86.c qemu-kvm-0.12.4/qemu-kvm-x86.c
--- qemu-kvm-0.12.4.orig/qemu-kvm-x86.c 2010-05-09 13:05:19.000000000 +0200
+++ qemu-kvm-0.12.4/qemu-kvm-x86.c 2010-06-06 16:46:08.000000000 +0200
@@ -1259,6 +1259,7 @@
int i, features = 0;
for (i = 0; i < ARRAY_SIZE(para_features)-1; i++) {
+ if (para_features[i].cap == KVM_CAP_CLOCKSOURCE && !kvm_clock)
continue;
if (kvm_check_extension(kvm_state, para_features[i].cap))
features |= (1 << para_features[i].feature);
}
diff -ur qemu-kvm-0.12.4.orig/qemu-options.hx qemu-kvm-0.12.4/qemu-options.hx
--- qemu-kvm-0.12.4.orig/qemu-options.hx 2010-05-09 13:05:19.000000000
+0200
+++ qemu-kvm-0.12.4/qemu-options.hx 2010-06-06 16:38:46.000000000 +0200
@@ -1959,6 +1959,9 @@
"-no-kvm-pit disable KVM kernel mode PIT\n")
DEF("no-kvm-pit-reinjection", 0, QEMU_OPTION_no_kvm_pit_reinjection,
"-no-kvm-pit-reinjection disable KVM kernel mode PIT interrupt
reinjection\n")
+DEF("no-kvm-clock", 0, QEMU_OPTION_no_kvm_clock,
+ "-no-kvm-clock disable KVM pvclock\n")
+
#if defined(TARGET_I386) || defined(TARGET_X86_64) || defined(TARGET_IA64) ||
defined(__linux__)
DEF("pcidevice", HAS_ARG, QEMU_OPTION_pcidevice,
"-pcidevice host=bus:dev.func[,dma=none][,name=string]\n"
diff -ur qemu-kvm-0.12.4.orig/vl.c qemu-kvm-0.12.4/vl.c
--- qemu-kvm-0.12.4.orig/vl.c 2010-05-09 13:05:19.000000000 +0200
+++ qemu-kvm-0.12.4/vl.c 2010-06-06 17:05:53.000000000 +0200
@@ -5530,6 +5530,10 @@
kvm_pit_reinject = 0;
break;
}
+ case QEMU_OPTION_no_kvm_clock: {
+ kvm_clock = 0;
+ break;
+ }
case QEMU_OPTION_enable_nesting: {
kvm_nested = 1;
break;
>
> Regards,
> Faidon
>
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