On 2012-01-17 19:07, Eric B Munson wrote:
> Often when a guest is stopped from the qemu console, it will report spurious
> soft lockup warnings on resume. There are kernel patches being discussed that
> will give the host the ability to tell the guest that it is being stopped and
> should ignore the soft lockup warning that generates. This patch uses the
> qemu
> Notifier system to tell the guest it is about to be stopped.
>
> Signed-off-by: Eric B Munson <emun...@mgebm.net>
>
> Cc: Avi Kivity <a...@redhat.com>
> Cc: Marcelo Tosatti <mtosa...@redhat.com>
> Cc: Jan Kiszka <jan.kis...@siemens.com>
> Cc: ry...@linux.vnet.ibm.com
> Cc: aligu...@us.ibm.com
> Cc: kvm@vger.kernel.org
> ---
> Changes from V5:
> KVM_GUEST_PAUSED is now a per vm ioctl instead of per vcpu
>
> Changes from V4:
> Test if the guest paused capability is available before use
>
> Changes from V3:
> Collapse new state change notification function into existsing function.
> Correct whitespace issues
> Change ioctl name to KVMCLOCK_GUEST_PAUSED
> Use for loop to iterate vpcu's
>
> Changes from V2:
> Move ioctl into hw/kvmclock.c so as other arches can use it as it is
> implemented
>
> Changes from V1:
> Remove unnecessary encapsulating function
> hw/kvmclock.c | 12 ++++++++++++
> 1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/hw/kvmclock.c b/hw/kvmclock.c
> index 3b9fb20..a30504c 100644
> --- a/hw/kvmclock.c
> +++ b/hw/kvmclock.c
> @@ -18,6 +18,7 @@
> #include "sysbus.h"
> #include "kvm.h"
> #include "kvmclock.h"
> +#include "cpu-all.h"
Still needed?
>
> #include <linux/kvm.h>
> #include <linux/kvm_para.h>
> @@ -64,10 +65,21 @@ static int kvmclock_post_load(void *opaque, int
> version_id)
> static void kvmclock_vm_state_change(void *opaque, int running,
> RunState state)
> {
> + int ret;
> KVMClockState *s = opaque;
> + int cap_guest_paused = kvm_check_extension(kvm_state,
> KVM_CAP_GUEST_PAUSED);
>
> if (running) {
> s->clock_valid = false;
> +
> + if (!cap_guest_paused) {
> + return;
> + }
> +
> + ret = kvm_vm_ioctl(kvm_state, KVMCLOCK_GUEST_PAUSED, 0);
> + if (ret) {
> + fprintf(stderr, "kvmclock_vm_state_change: %s\n",
> strerror(-ret));
> + }
> }
> }
>
Looks good otherwise.
Thanks,
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
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