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    Subject[PATCH v2 4/7] KVM-GST: Add a pv_ops stub for steal time
    Date
    This patch adds a function pointer in one of the many paravirt_ops
    structs, to allow guests to register a steal time function.

    Signed-off-by: Glauber Costa <glommer@redhat.com>
    CC: Rik van Riel <riel@redhat.com>
    CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    CC: Peter Zijlstra <peterz@infradead.org>
    CC: Avi Kivity <avi@redhat.com>
    CC: Anthony Liguori <aliguori@us.ibm.com>
    CC: Eric B Munson <emunson@mgebm.net>
    ---
    arch/x86/include/asm/paravirt.h | 9 +++++++++
    arch/x86/include/asm/paravirt_types.h | 1 +
    arch/x86/kernel/paravirt.c | 9 +++++++++
    3 files changed, 19 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
    index ebbc4d8..a7d2db9 100644
    --- a/arch/x86/include/asm/paravirt.h
    +++ b/arch/x86/include/asm/paravirt.h
    @@ -230,6 +230,15 @@ static inline unsigned long long paravirt_sched_clock(void)
    return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
    }

    +struct jump_label_key;
    +extern struct jump_label_key paravirt_steal_enabled;
    +extern struct jump_label_key paravirt_steal_rq_enabled;
    +
    +static inline u64 paravirt_steal_clock(int cpu)
    +{
    + return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
    +}
    +
    static inline unsigned long long paravirt_read_pmc(int counter)
    {
    return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
    diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
    index 8288509..2c76521 100644
    --- a/arch/x86/include/asm/paravirt_types.h
    +++ b/arch/x86/include/asm/paravirt_types.h
    @@ -89,6 +89,7 @@ struct pv_lazy_ops {

    struct pv_time_ops {
    unsigned long long (*sched_clock)(void);
    + unsigned long long (*steal_clock)(int cpu);
    unsigned long (*get_tsc_khz)(void);
    };

    diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
    index 869e1ae..613a793 100644
    --- a/arch/x86/kernel/paravirt.c
    +++ b/arch/x86/kernel/paravirt.c
    @@ -202,6 +202,14 @@ static void native_flush_tlb_single(unsigned long addr)
    __native_flush_tlb_single(addr);
    }

    +struct jump_label_key paravirt_steal_enabled;
    +struct jump_label_key paravirt_steal_rq_enabled;
    +
    +static u64 native_steal_clock(int cpu)
    +{
    + return 0;
    +}
    +
    /* These are in entry.S */
    extern void native_iret(void);
    extern void native_irq_enable_sysexit(void);
    @@ -307,6 +315,7 @@ struct pv_init_ops pv_init_ops = {

    struct pv_time_ops pv_time_ops = {
    .sched_clock = native_sched_clock,
    + .steal_clock = native_steal_clock,
    };

    struct pv_irq_ops pv_irq_ops = {
    --
    1.7.3.4


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