This is inspired by commit
262de4102c7bb8 (kvm: exit halt polling on
need_resched() as well). Due to PPC implements an arch specific halt
polling logic, we have to the need_resched() check there as well. This
patch adds a helper function that can be shared between book3s and generic
halt-polling loops.
Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Venkatesh Srinivas <venkateshs@chromium.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Venkatesh Srinivas <venkateshs@chromium.org>
Cc: Jim Mattson <jmattson@google.com>
Cc: David Matlack <dmatlack@google.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <
1621339235-11131-1-git-send-email-wanpengli@tencent.com>
[Make the function inline. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
break;
}
cur = ktime_get();
- } while (single_task_running() && ktime_before(cur, stop));
+ } while (kvm_vcpu_can_poll(cur, stop));
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
#include <linux/spinlock.h>
#include <linux/signal.h>
#include <linux/sched.h>
+#include <linux/sched/stat.h>
#include <linux/bug.h>
#include <linux/minmax.h>
#include <linux/mm.h>
return !!map->hva;
}
+static inline bool kvm_vcpu_can_poll(ktime_t cur, ktime_t stop)
+{
+ return single_task_running() && !need_resched() && ktime_before(cur, stop);
+}
+
/*
* Sometimes a large or cross-page mmio needs to be broken up into separate
* exits for userspace servicing.
goto out;
}
poll_end = cur = ktime_get();
- } while (single_task_running() && !need_resched() &&
- ktime_before(cur, stop));
+ } while (kvm_vcpu_can_poll(cur, stop));
}
prepare_to_rcuwait(&vcpu->wait);