On Wed, Sep 14, 2011 at 10:51:41AM +0800, Liu, Jinsong wrote:
> Jan Kiszka wrote:
> > On 2011-09-13 16:38, Liu, Jinsong wrote:
> >> From c1b502d6548fcc41592cd90acc82109ee949df75 Mon Sep 17 00:00:00
> >> 2001
> >> From: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
> >> Date: Tue, 13 Sep 2011 22:05:30 +0800
> >> Subject: [PATCH] Qemu co-operation with kvm tsc deadline timer
> >>
> >> KVM add emulation of lapic tsc deadline timer for guest.
> >> This patch is co-operation work at qemu side.
> >>
> >> Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx> ---
> >> target-i386/cpu.h | 2 ++
> >> target-i386/kvm.c | 14 ++++++++++++++
> >> 2 files changed, 16 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/target-i386/cpu.h b/target-i386/cpu.h
> >> index 935d08a..62ff73c 100644
> >> --- a/target-i386/cpu.h
> >> +++ b/target-i386/cpu.h
> >> @@ -283,6 +283,7 @@
> >> #define MSR_IA32_APICBASE_BSP (1<<8)
> >> #define MSR_IA32_APICBASE_ENABLE (1<<11)
> >> #define MSR_IA32_APICBASE_BASE (0xfffff<<12)
> >> +#define MSR_IA32_TSCDEADLINE 0x6e0
> >>
> >> #define MSR_MTRRcap 0xfe
> >> #define MSR_MTRRcap_VCNT 8
> >> @@ -687,6 +688,7 @@ typedef struct CPUX86State {
> >> uint64_t async_pf_en_msr;
> >>
> >> uint64_t tsc;
> >> + uint64_t tsc_deadline;
> >
> > This field has to be saved/restored for snapshots/migrations.
> >
> > Frankly, I've no clue right now if substates are in vogue again (they
> > had problems in their binary format) or if you can simply add a
> > versioned top-level field and bump the CPUState version number.
> >
>
> Yes, it would be saved/restored. After migration, tsc_deadline would be set to MSR_IA32_TSCDEADLINE to trigger tsc timer interrupt.
Jan means you should explicitly add this to machine.c.
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