Commit 3c404b57 authored by Glauber Costa's avatar Glauber Costa Committed by Avi Kivity

KVM guest: Add a pv_ops stub for steal time

This patch adds a function pointer in one of the many paravirt_ops
structs, to allow guests to register a steal time function. Besides
a steal time function, we also declare two jump_labels. They will be
used to allow the steal time code to be easily bypassed when not
in use.
Signed-off-by: default avatarGlauber Costa <glommer@redhat.com>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Tested-by: default avatarEric B Munson <emunson@mgebm.net>
CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent c9aaa895
...@@ -230,6 +230,15 @@ static inline unsigned long long paravirt_sched_clock(void) ...@@ -230,6 +230,15 @@ static inline unsigned long long paravirt_sched_clock(void)
return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock); 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) static inline unsigned long long paravirt_read_pmc(int counter)
{ {
return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter); return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
......
...@@ -89,6 +89,7 @@ struct pv_lazy_ops { ...@@ -89,6 +89,7 @@ struct pv_lazy_ops {
struct pv_time_ops { struct pv_time_ops {
unsigned long long (*sched_clock)(void); unsigned long long (*sched_clock)(void);
unsigned long long (*steal_clock)(int cpu);
unsigned long (*get_tsc_khz)(void); unsigned long (*get_tsc_khz)(void);
}; };
......
...@@ -202,6 +202,14 @@ static void native_flush_tlb_single(unsigned long addr) ...@@ -202,6 +202,14 @@ static void native_flush_tlb_single(unsigned long addr)
__native_flush_tlb_single(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 */ /* These are in entry.S */
extern void native_iret(void); extern void native_iret(void);
extern void native_irq_enable_sysexit(void); extern void native_irq_enable_sysexit(void);
...@@ -307,6 +315,7 @@ struct pv_init_ops pv_init_ops = { ...@@ -307,6 +315,7 @@ struct pv_init_ops pv_init_ops = {
struct pv_time_ops pv_time_ops = { struct pv_time_ops pv_time_ops = {
.sched_clock = native_sched_clock, .sched_clock = native_sched_clock,
.steal_clock = native_steal_clock,
}; };
struct pv_irq_ops pv_irq_ops = { struct pv_irq_ops pv_irq_ops = {
......
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