diff options
Diffstat (limited to 'arch/loongarch/kernel/paravirt.c')
| -rw-r--r-- | arch/loongarch/kernel/paravirt.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/arch/loongarch/kernel/paravirt.c b/arch/loongarch/kernel/paravirt.c index b1b51f920b23..b74fe6db49ab 100644 --- a/arch/loongarch/kernel/paravirt.c +++ b/arch/loongarch/kernel/paravirt.c @@ -6,21 +6,14 @@ #include <linux/kvm_para.h> #include <linux/reboot.h> #include <linux/static_call.h> +#include <linux/sched/cputime.h> #include <asm/paravirt.h> static int has_steal_clock; -struct static_key paravirt_steal_enabled; -struct static_key paravirt_steal_rq_enabled; static DEFINE_PER_CPU(struct kvm_steal_time, steal_time) __aligned(64); +static DEFINE_STATIC_KEY_FALSE(virt_preempt_key); DEFINE_STATIC_KEY_FALSE(virt_spin_lock_key); -static u64 native_steal_clock(int cpu) -{ - return 0; -} - -DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock); - static bool steal_acc = true; static int __init parse_no_stealacc(char *arg) @@ -267,6 +260,18 @@ static int pv_time_cpu_down_prepare(unsigned int cpu) return 0; } + +bool vcpu_is_preempted(int cpu) +{ + struct kvm_steal_time *src; + + if (!static_branch_unlikely(&virt_preempt_key)) + return false; + + src = &per_cpu(steal_time, cpu); + return !!(src->preempted & KVM_VCPU_PREEMPTED); +} +EXPORT_SYMBOL(vcpu_is_preempted); #endif static void pv_cpu_reboot(void *unused) @@ -308,6 +313,9 @@ int __init pv_time_init(void) pr_err("Failed to install cpu hotplug callbacks\n"); return r; } + + if (kvm_para_has_feature(KVM_FEATURE_PREEMPT)) + static_branch_enable(&virt_preempt_key); #endif static_call_update(pv_steal_clock, paravt_steal_clock); @@ -318,7 +326,10 @@ int __init pv_time_init(void) static_key_slow_inc(¶virt_steal_rq_enabled); #endif - pr_info("Using paravirt steal-time\n"); + if (static_key_enabled(&virt_preempt_key)) + pr_info("Using paravirt steal-time with preempt enabled\n"); + else + pr_info("Using paravirt steal-time with preempt disabled\n"); return 0; } |