Re: [PATCH] KVM: emulate lapic tsc deadline timer for hvm

[Marcelo Tosatti <mtosatti@redhat.com>]

On Sat, Sep 10, 2011 at 02:11:36AM +0800, Liu, Jinsong wrote:
> Marcelo Tosatti wrote:
> > On Fri, Sep 09, 2011 at 01:12:51AM +0800, Liu, Jinsong wrote:
> >>>>> --- a/arch/x86/include/asm/msr-index.h
> >>>>> +++ b/arch/x86/include/asm/msr-index.h
> >>>>> @@ -229,6 +229,8 @@
> >>>>>  #define MSR_IA32_APICBASE_ENABLE	(1<<11)
> >>>>>  #define MSR_IA32_APICBASE_BASE		(0xfffff<<12)
> >>>>> 
> >>>>> +#define MSR_IA32_TSCDEADLINE		0x000006e0
> >>>>> +
> >>>>>  #define MSR_IA32_UCODE_WRITE		0x00000079
> >>>>>  #define MSR_IA32_UCODE_REV		0x0000008b
> >>>> 
> >>>> Need to add to msrs_to_save so live migration works.
> >>> 
> >>> MSR must be explicitly listed in qemu, also.
> >>> 
> >> 
> >> Marcelo, seems MSR don't need explicitly list in qemu?
> >> KVM side adding MSR_IA32_TSCDEADLINE to msrs_to_save is enough. Qemu
> >> will get it through KVM_GET_MSR_INDEX_LIST. Do I miss something?
> > 
> > Notice in target-i386/kvm.c the KVM_GET_MSR_INDEX_LIST list is only
> > used for MSR_STAR/MSR_HSAVE_PA presence detection.
> 
> Yes
> 
> > 
> > Do you do need to explicitly add MSR_IA32_TSCDEADLINE to
> > kvm_get_msrs/kvm_put_msrs routines.
> 
> My question is, which kvm_get_msrs/kvm_put_msrs routine be used by live migration, the routine in target-i386/kvm.c, or in kvm/libkvm/libkvm-x86.c? They both have ioctl KVM_GET_MSR_INDEX_LIST/ KVM_GET_MSRS/ KVM_SET_MSRS, but I'm not clear their purpose/usage difference.

kvm_get_msrs/kvm_put_msrs in target-i386/kvm.c. kvm/ directory is dead.