KVM: s390: provide kvm_arch_no_poll function

We do track the current steal time of the host CPUs. Let us use
this value to disable halt polling if the steal time goes beyond
a configured value.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index e224246..bdbc81b 100644 (file)
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -313,6 +313,7 @@ struct kvm_vcpu_stat {
        u64 halt_successful_poll;
        u64 halt_attempted_poll;
        u64 halt_poll_invalid;
+       u64 halt_no_poll_steal;
        u64 halt_wakeup;
        u64 instruction_lctl;
        u64 instruction_lctlg;

diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index 767453f..e987e73 100644 (file)
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -31,6 +31,7 @@ config KVM
        select HAVE_KVM_IRQFD
        select HAVE_KVM_IRQ_ROUTING
        select HAVE_KVM_INVALID_WAKEUPS
+       select HAVE_KVM_NO_POLL
        select SRCU
        select KVM_VFIO
        ---help---

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index eb68ada..ed280a4 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -75,6 +75,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
        { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
        { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
        { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
+       { "halt_no_poll_steal", VCPU_STAT(halt_no_poll_steal) },
        { "halt_wakeup", VCPU_STAT(halt_wakeup) },
        { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
        { "instruction_lctl", VCPU_STAT(instruction_lctl) },
@@ -177,6 +178,11 @@ static int hpage;
 module_param(hpage, int, 0444);
 MODULE_PARM_DESC(hpage, "1m huge page backing support");
 
+/* maximum percentage of steal time for polling.  >100 is treated like 100 */
+static u8 halt_poll_max_steal = 10;
+module_param(halt_poll_max_steal, byte, 0644);
+MODULE_PARM_DESC(hpage, "Maximum percentage of steal time to allow polling");
+
 /*
  * For now we handle at most 16 double words as this is what the s390 base
  * kernel handles and stores in the prefix page. If we ever need to go beyond
@@ -3166,6 +3172,17 @@ static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
        }
 }
 
+bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
+{
+       /* do not poll with more than halt_poll_max_steal percent of steal time */
+       if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >=
+           halt_poll_max_steal) {
+               vcpu->stat.halt_no_poll_steal++;
+               return true;
+       }
+       return false;
+}
+
 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
 {
        /* kvm common code refers to this, but never calls it */