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    SubjectRe: include files for kvmclock
    Glauber de Oliveira Costa wrote:
    > This patch introduces the include files for kvm clock.
    > They'll be needed for both guest and host part.
    >
    > Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
    > ---
    > include/asm-x86/kvm_para.h | 23 +++++++++++++++++++++++
    > include/linux/kvm.h | 1 +
    > include/linux/kvm_para.h | 20 ++++++++++++++++++++
    > 3 files changed, 44 insertions(+), 0 deletions(-)
    >
    > diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h
    > index c6f3fd8..af9fb75 100644
    > --- a/include/asm-x86/kvm_para.h
    > +++ b/include/asm-x86/kvm_para.h
    > @@ -10,15 +10,38 @@
    > * paravirtualization, the appropriate feature bit should be checked.
    > */
    > #define KVM_CPUID_FEATURES 0x40000001
    > +#define KVM_FEATURE_CLOCKEVENTS 0
    > +#define KVM_FEATURE_CLOCKSOURCE 1
    > +
    >
    > #ifdef __KERNEL__
    > #include <asm/processor.h>
    > +extern void kvmclock_init(void);
    > +
    > +union kvm_hv_clock {
    >

    Why two copies of this structure?

    > + struct {
    > + u64 tsc_mult;
    > + u64 now_ns;
    > + /* That's the wall clock, not the water closet */
    > + u64 wc_sec;
    > + u64 wc_nsec;
    > + u64 last_tsc;
    > + /* At first, we could use the tsc value as a marker, but Jeremy
    > + * well noted that it will cause us locking problems in 32-bit
    > + * sys, so we have a special version field */
    > + u32 version;
    > + };
    > + char page_align[PAGE_SIZE];
    > +};
    > +
    >

    [...]

    > +
    > +union kvm_hv_clock {
    > + struct {
    > + u64 tsc_mult;
    > + u64 now_ns;
    > + /* That's the wall clock, not the water closet */
    > + u64 wc_sec;
    > + u64 wc_nsec;
    > + u64 last_tsc;
    > + /* At first, we could use the tsc value as a marker, but Jeremy
    > + * well noted that it will cause us locking problems in 32-bit
    > + * sys, so we have a special version field */
    > + u32 version;
    > + };
    > + char page_align[PAGE_SIZE];
    > +};
    > +
    > /*
    > * hypercalls use architecture specific
    > */
    >

    -
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