From 3c404b578fab699c4708279938078d9404b255a4 Mon Sep 17 00:00:00 2001 From: Glauber Costa Date: Mon, 11 Jul 2011 15:28:15 -0400 Subject: 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: Glauber Costa Acked-by: Rik van Riel Tested-by: Eric B Munson CC: Jeremy Fitzhardinge CC: Peter Zijlstra CC: Anthony Liguori Signed-off-by: Avi Kivity --- arch/x86/kernel/paravirt.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'arch/x86/kernel/paravirt.c') diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index 869e1aeeb71b..613a7931ecc1 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 = { -- cgit